Omega Engineering Network Card IOP 241 User Manual

IOP-241  
24 Channel Digital Input/ Output  
Type II PCMCIA Card  
Users Manual  
INTERFACE CARDS FOR PERSONAL COMPUTERS  
OMEGA ENGINEERING, INC.  
One Omega Drive  
P.O. Box 4047  
Tel: (203) 359-1660  
Fax: (203) 359-7700  
Toll free: 1-800-826-6342  
Stamford, CT 06907-4047  
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Declaration of Conformity  
Manufacturer's Name:  
Omega Engineering, Inc.  
Manufacturers Address:  
One Omega Drive  
Stamford, CT 06907-0047  
Application of Council Directive:  
89/ 336/ EEC  
Standards to which  
Conformity is Declared:  
* EN50081-2  
(EN55022)  
* EN50082-1  
(IEC 801-2, IEC 801-3, & IEC 801-4)  
Type of Equipment:  
Equipment Class:  
Product Name:  
Information Technology Equipment  
Commercial, Residential and Light Industrial  
PCMCIA Card  
Model Number :  
IOP-241  
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OMEGAnet On-line Service:  
Internet e-mail:  
info@omega.com  
Servicing North America:  
USA:  
ISO 9001 Certified  
One Omega Drive, Box 4047  
Stamford, CT 06907-0047  
Tel: (203) 359-1660  
E-mail: info@omega.com  
FAX: (203) 359-7700  
Canada:  
976 Bergar  
Laval (Quebec) H7L 5A1  
Tel: (514) 856-6928  
E-mail: info@omega.com  
FAX: (514) 856-6886  
For immediate technical or application assistance:  
USA and Canada:  
Sales Service: 1-800-826-6342 / 1-800-TC-OMEGASM  
Customer Service: 1-800-622-2378/ 1-800-622-BESTSM  
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN SM  
TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA  
Mexico and Latin America: Tel: (001) 800-826-6342  
En Espanol: (001) 203-359-7803  
E-mail: espanol@omega.com  
FAX: (001) 203-359-7807  
Servicing Europe:  
Benelux:  
Postbus 8034, 1180 LA Amstelveen, The Netherlands  
Tel: (31) 20 6418405  
Toll Free in Benelux: 0800 0993344  
E-mail: nl@omega.com  
Czech Republic:  
ul.Rude armady 1868, 733 01 Karvina-Hraniee  
Tel: 42 (69) 6311899  
Toll Free: 0800-1-66342  
FAX: 42 (69) 6311114  
E-mail: czech@omega.com  
France:  
9, rue Denis Papin, 78190 Trappes  
Tel: (33) 130-621-400  
Toll Free in France: 0800-4-06342  
E-mail: france@omega.com  
Germany/Austria:  
Daimlerstrasse 26, D-75392 Deckenpfronn, Germany  
Tel: 49 (07056) 3017  
Toll Free in Germany: 0130 11 21 66  
E-mail: germany@omega.com  
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United Kingdom:  
ISO 9002 Certified  
One Omega Drive, River Bend Technology Drive  
Northbank, Irlam, Manchester  
M44 5EX, England  
Tel: 44 (161) 777-6611  
FAX: 44 (161) 777-6622  
Toll Free in England: 0800-488-488  
E-mail: info@omega.co.uk  
It is the policy of OMEGA to comply with all worldwide safety and EMC/ EMI regulations that apply.  
OMEGA is constantly pursuing certification of its products to the European New Approach Directives.  
OMEGA will add the CE mark to every appropriate device upon certification.  
The information contained in this document is believed to be correct but OMEGA Engineering, Inc.  
accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.  
WARNING: These products are not designed for use in, and should not be used for, patient connected  
applications.  
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Table of Contents  
1. Introduction  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
1.2 System Configuration  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
2. DOS / Windows 3.x Installation  
2.1 IOP-241 Client Driver for DOS  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
2.1.1 Client Driver Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
2.1.2 Command Line Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
2.1.3 Common Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
2.2.1 Enabler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
2.2.2 Command Line Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
2.2.3 Common Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
2.3 After Completing Configuration  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
3. Windows 95/98® Installation  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
3.2 Resource Settings in Windows 95/ 98  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
3.2.1 Viewing Resource Settings with Device Manager . . . . . . . . . . . . . . . . . . . . . . . 20  
3.3 Changing Resource Settings with Device Manager  
. . . . . . . . . . . . . . . . 21  
3.4 After Completing Configuration  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22  
4. Theory of Operation  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23  
4.1 I/ O Port Description  
4.2 Port C Interrupt Description  
4.3 External Interrupt Description  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
5. Register Descriptions  
5.1 Data Port A Control Register (Base + 0)  
5.2 Data Port B Control Register (Base + 1)  
5.3 Data Port C Control Register (Base + 2)  
. . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
5.4 Port C Interrupt Enable Register (Base + 5)  
5.5 Interrupt Mode Control Register (Base + 6)  
. . . . . . . . . . . . . . . . . . . . . . . . 27  
. . . . . . . . . . . . . . . . . . . . . . . . 28  
5.6 Interrupt Status Register (Read Only) (Base + 7)  
. . . . . . . . . . . . . . . . . . . 28  
5.7 Interrupt Acknowledge Register (Write Only) (Base + 7)  
. . . . . . . . . . . 29  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
5.8 Summary of Interrupt Source Options  
5.9 Summary of Input/ Output Options  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
5.10 Programming Example  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
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7. Optional Accessories  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
7.1 CP-1037 Cable Assembly  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
7.2 UIO-37 Screw Terminal Block  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34  
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List of Figures and Tables  
Figure 1-1. IOP-241 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Figure 3-1. Windows 95/ 98 Resource Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
Figure 6-1. IOP-241 33-Pin Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Figure 7-1. CP-1037 D37 Pin Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
Figure 7-2. UIO-37 Screw Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34  
Table 1-1. Client Driver versus Enabler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Table 5-1. IOP-241 Program Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
Table 5-2. Data Port A Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
Table 5-3. Data Port B Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
Table 5-4. Data Port C Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
Table 5-5. Port C Interrupt Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Table 5-6. Interrupt Mode Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
Table 5-7. Interrupt Status Register (Read Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
Table 5-8. Interrupt Status Register (Write Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
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1. Introduction  
The IOP-241 is a 24 channel digital input/ output card for systems equipped with PCMCIA  
Type II and/ or Type III expansion sockets.  
1.1  
IOP-241 Features  
PC Card Standard Specification 2.10 Compliant  
24 TTL compatible digital I/ O channels (8 channels can be used as interrupt sources)  
Channels individually programmable as either input or output  
Active high sensitive, active low sensitive, low-to-high transistion or high-to-low  
transition interrupt modes (external interrupt available)  
1.2  
System Configuration  
The figure below illustrates a complete IOP-241 system. For users that do not wish to interface  
to the IOP-241 0.8mm I/ O connector, an optional adapter cable (CP-1037) is available to  
convert this connector into an industry standard D-37 connector. For applications requiring  
discrete wiring hook-ups, an optional screw terminal block (UIO-37) is available to convert the  
D-37 connector into 37 single screw terminal blocks. These optional accessories are described  
in detail in Chapter 7.  
D37  
IOP-241  
UIO-37  
Hirose-32  
CP-IO37  
Figure 1-1. IOP-241 System Configuration  
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2. DOS / Windows 3.x Installation  
Two configuration software programs are provided with the IOP-241: a Client Driver and a  
card Enabler. Both of these programs are executed from DOS (before entering Windows) and  
allow operation of the IOP-241 in both the DOS and Windows 3.x environments. For optimal  
operation, the Client Driver is the preferred method of installation and configuration. The  
table below highlights the differences between these programs.  
Client Driver (recommended)  
File name: IOP241CL.SYS  
Enabler  
File name: IOP241EN.EXE  
File type: DOS executable  
File type: DOS device driver  
Interfaces to PCMCIA Card and Socket  
Services software (PCMCIA host adapter  
independent)  
Interfaces directly to Intel 82365SL and  
other PCIC compatible PCMCIA host  
adapters  
Allows automatic configuration of IOP-241  
adapters upon insertion (Hot Swapping)  
Does not support automatic configuration  
of IOP-241 adapters upon insertion  
(Hot Swapping)  
Requires PCMCIA Card and Socket Services  
software  
Does not require PCMCIA Card and Socket  
Services software  
Table 1-1. Client Driver versus Enabler  
If you are unsure whether Card and Socket Services software is currently installed on your  
system, install the IOP-241 Client Driver as discussed in following section. When loaded, the  
Client Driver will display an error message if Card and Socket Services software is not  
detected.  
2.1  
IOP-241 Client Driver for DOS  
In order to use the IOP-241 Client Driver, the system must be configured with Card and  
Socket Services software. (Card and Socket Services software is not provided with the  
IOP-241).  
IMPORTANT:  
Some versions of Card and Socket Services dated before  
1993 do not support general purpose I/ O cards. If after  
careful installation of the Client Driver, the IOP-241 does  
not configure or operate properly, an updated version of  
Card and Socket Services software may be required.  
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2.1.1  
Client Driver Installation  
The following procedure is used to install the IOP-241 Client Driver:  
1. Copy the file IOP241CL.SYS from the customer software CD-ROM directory  
PCMCIA\ DOS\ CLIENTS onto the root directory of the system hard drive.  
2. Using an ASCII text editor, open the system CONFIG.SYS file located in the root  
directory of the boot drive.  
3. Locate the line(s) in the CONFIG.SYS file where the Card and Socket Services  
software is installed.  
4. AFTER the line(s) installing the Card and Socket Services software, add the  
following to the CONFIG.SYS file: DEVICE = drive:\ path\ IOP241CL.SYS(options),  
where options are the IOP-241 Client Driver command line options discussed on the  
following pages. (Path is only required if the user places the Client Driver  
executable file in a directory other than the root directory).  
5. Save the CONFIG.SYS file and exit the text editor.  
6. Insert the IOP-241 into one of the system PCMCIA slots.  
NOTE: Since the IOP-241 Client Driver supports "Hot Swapping", it is not  
necessary to have the IOP-241 installed when booting the system. However, by  
inserting the card before booting, the Client Driver will report the card  
configuration during the boot process thereby verifying changes made to the  
CONFIG.SYS file.  
7. Reboot the system and note the message displayed when the IOP-241 Client Driver  
is loaded. If the Client Driver reports an "invalid command line option", correct the  
entry in the CONFIG.SYS file and reboot the system again. If the Client Driver  
reports "Card and Socket Services not found", then Card and Socket Services  
software must be installed on the system or the IOP-241 Enabler program must be  
used to configure the card. If the Client Driver reports the desired card  
configuration, the installation process is complete and the IOP-241 may be removed  
and/ or inserted from the system as desired. On each insertion into the PCMCIA  
socket, the IOP-241 will be automatically reconfigured according to the command  
line options.  
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2.1.2  
Command Line Options  
The Client Driver accepts up to eight command line arguments from the user to determine the  
configuration of the IOP-241. If any arguments are provided, the Client Driver will attempt to  
configure the IOP-241 with the options specified in the order they are entered on the  
command line. Each argument must be enclosed in parenthesis and must be separated from  
other arguments by a space on the command line. Within each argument, any or all of the  
following parameters may be specified using a comma (no spaces) to separate each parameter:  
b address Specifies the base I/ O address of the IOP-241 in hexadecimal.  
Addressmust reside on an even 8-byte boundary (I/ O base address must  
end in '0' or '8'). The valid range for the IOP-241’s base address is 100H to 3F8H.  
If this option is omitted, a base address is assigned by Card and Socket Services.  
i irq  
Specifies the interrupt level (IRQ) of the IOP-241 in decimal.  
“Irqmust be one of the following values: 3, 4, 5, 7, 9, 10, 11, 12, 14, 15 or 0  
if no IRQ is desired. If this option is omitted, an interrupt level will be assigned  
by Card and Socket Services.  
s socket  
Specifies which PCMCIA socket the IOP-241 must be inserted into for  
this configuration argument to be used. “Socketmust be in the range of 0 - 15.  
If this option is omitted, the configuration argument will apply to cards  
inserted into any socket.  
2.1.2.1 Example 1  
DEVICE = C:\ IOP241CL.SYS  
No command line arguments are specified. The Client Driver will configure an IOP-241  
inserted into any socket with a base address and IRQ assigned by Card and Socket Services.  
2.1.2.2 Example 2  
DEVICE = C:\ IOP241CL.SYS (b330)  
A single command line argument is provided. The Client Driver will attempt to configure an  
IOP-241 inserted into any socket at address 330H and an IRQ assigned by Card and Socket  
Services. If address 330H is unavailable, the IOP-241 will not be configured.  
2.1.2.3 Example 3  
DEVICE = C:\ IOP241CL.SYS (s0,b300,i5)  
A single command line argument is provided. The Client Driver will attempt to configure an  
IOP-241 inserted into socket 0 with a base address of 300H and IRQ 5. If address 300H or IRQ  
5 are unavailable, the IOP-241 will not be configured. In addition, if an IOP-241 is inserted  
into any other socket, it will not be configured.  
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2.1.2.4 Example 4  
DEVICE = C:\ IOP241CL.SYS (i11,b300)  
A single command line argument is provided. Because the parameter order is not significant,  
the Client Driver will attempt to configure an IOP-241 inserted into any socket with a base  
address of 300H and IRQ 11. If address 300H or IRQ 11 are unavailable, the IOP-241 will not  
be configured.  
2.1.2.5 Example 5  
DEVICE = C:\ IOP241CL.SYS (b300,i5) (i10) ( )  
Three command line arguments are provided. The Client Driver will first attempt to  
configure an IOP-241 inserted into any socket with a base address of 300H and IRQ5. If  
address 300H or IRQ 5 are unavailable, the Client Driver will proceed to the second command  
line argument and attempt to configure the card with a base address assigned by Card and  
Socket Services and IRQ 10. If IRQ 10 is also unavailable, the Client Driver will proceed to the  
third command line argument and attempt to configure the IOP-241 with a base address and  
an IRQ assigned by Card and Socket Services.  
2.1.2.6 Example 6  
DEVICE = C:\ IOP241CL.SYS (b300,i5) ( ) (i10)  
In example 6, the three command line arguments of example 5 have been rearranged. The  
Client Driver will first attempt to configure an IOP-241 inserted into any socket with a base  
address of 300H and IRQ 5. If address 300H or IRQ 5 are unavailable, the Client Driver will  
proceed to the second command line argument and attempt to configure the card with a base  
address and IRQ assigned by Card and Socket Services. Since the second command line  
argument includes all available address and IRQ resources, the third command line argument  
will never be reached by the Client Driver. The user must ensure the command line  
arguments are placed in a logical order.  
2.1.2.7 Example 7  
DEVICE = C:\ IOP241CL.SYS (s0,b300,i5) (s1,b340,i10)  
The type of configuration shown in example 7 may be desirable in systems where more than  
one IOP-241 is to be installed. In this example, the Client Driver will attempt to configure an  
IOP-241 inserted into socket 0 with a base address of 300H and IRQ 5. If the IOP-241 is  
inserted into socket 1, the Client Driver will attempt to configure it with base address 340H  
and IRQ 10. This allows the user to force the IOP-241's address and IRQ settings to be socket  
specific which may simplify cable connections and software development. As in the previous  
examples, however, if the requested address or interrupt resources are not available, the  
IOP-241 will not be configured.  
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2.1.3  
Common Problems  
2.1.3.1 Generic Client Drivers  
Many Card and Socket Services packages include a generic client driver (or SuperClient)  
which configures standard I/ O devices. If one of these generic client drivers is installed, it  
may configure the IOP-241 causing the client driver to fail installation. In these cases, the user  
should do one of the following:  
1. Modify the operation of the generic client driver to disable the configuration of  
modem/ serial port cards. Consult the Card and Socket Services documentation for  
availability and details of this feature.  
2. Place the IOP-241 client driver entry before the generic client driver entry in the  
system CONFIG.SYS file.  
2.1.3.2 Available Resources  
One function of the Card and Socket Services software is to track which system resources  
(memory addresses, I/ O addresses, IRQs, etc.) are available for assignment to inserted  
PCMCIA cards. Sometimes, however, the software assumes or incorrectly determines that a  
particular resource is used when it is actually available. Most Card and Socket Services  
generate a resource table in a file (typically in the form of an .INI file) which the user can  
modify to adjust the available system resources. Consult the Card and Socket Services  
documentation for availability and details of this feature.  
2.1.3.3 Multiple Configuration Attempts  
Some Card and Socket Services have a setting which aborts the configuration process after a  
single configuration failure (such as a request for an unavailable resource). The user should  
change this setting to allow for multiple configuration attempts. Consult the Card and Socket  
Services documentation for availability and details of this feature.  
2.1.3.4 Older Versions of Card and Socket Services  
Some versions of Card and Socket Services dated before 1993 do not support general purpose  
I/ O cards. If after careful installation of the Client Driver the IOP-241 does not configure or  
operate properly, an updated version of Card and Socket Services may be required. Card and  
Socket Services software is available from Omega.  
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2.2  
IOP-241 Enabler for DOS  
For systems that are not operating PCMCIA Card and Socket Services software, the IOP-241  
DOS Enabler may be used to enable and configure the card. This Enabler, IOP241EN.EXE,  
will operate on any DOS system using an Intel 82365SL or PCIC compatible PCMCIA host  
adapter including the Cirrus Logic CL-PD6710/ 6720, the VLSI VL82C146 and the Vadem  
VG-365.  
IMPORTANT:  
In order to use the IOP-241 Enabler for DOS, the system  
MUST NOT be configured with Card and Socket Services  
software. If a Card and Socket Services software is installed,  
the IOP-241 Enabler may interfere with its operation and  
with the device(s) it controls.  
The IOP-241 Enabler does not support automatic configuration of adapters upon insertion,  
more commonly referred to as "Hot Swapping". This means the card must be installed in one  
of the system's PCMCIA sockets before executing IOP241EN.EXE. If more than one card is  
installed in a system, the Enabler must be executed separately for each card. Furthermore,  
IOP241EN.EXE should be executed to release the resources used by the card before it is  
removed from the PCMCIA socket. Since PCMCIA adapters do not retain their configuration  
after removal, any card that is removed from the system must be reconfigured with the  
Enabler after re-insertion into a PCMCIA socket.  
IMPORTANT:  
The Enabler requires a region of high DOS memory when  
configuring an IOP-241. This region is 1000H bytes (4KB) long  
and by default begins at address D0000H (the default address  
may be changed using the "W" option). If a memory manager  
such as EMM386, QEMM, or 386Max is installed on the system,  
this region of DOS memory must be excluded from the memory  
manager's control. Consult the documentation provided with  
the memory manager software for instructions on how to  
exclude this memory region.  
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2.2.1  
Enabler Installation  
The following procedure is used to install the IOP-241 Enabler:  
1. Copy the file IOP241EN.EXE from the customer software CD-ROM  
(directory=PCMCIA\ DOS\ ENABLERS) onto the root directory of the system hard  
drive.  
2. Using an ASCII text editor, open the system's CONFIG.SYS file located in the root  
directory of the boot drive.  
3. Locate the line(s) in the CONFIG.SYS file where the Card and Socket Services  
software is installed.  
4. AFTER the line(s) installing the Card and Socket Services software, add the  
following to the CONFIG.SYS file: DEVICE = drive:\ path\ IOP241EN.EXE(options),  
where options are the IOP-241 Client Driver command line options discussed on the  
following pages. (Path is only required if the Enabler executable file is placed in a  
directory other than the root directory).  
5. Save the CONFIG.SYS file and exit the text editor.  
6. Insert the IOP-241 into one of the system's PCMCIA slots.  
NOTE: Since the IOP-241 Enabler does not support "Hot Swapping", it is necessary  
to have the IOP-241 installed when booting the system.  
7. Reboot the system and note the message displayed when the IOP-241 Enabler is  
loaded. If the Enabler reports an "invalid command line option", correct the entry in  
the CONFIG.SYS file and reboot the system again. If the Enabler reports the desired  
card configuration, the installation process is complete.  
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2.2.2  
Command Line Options  
To configure an IOP-241, the Enabler requires one command line argument from the user to  
determine the configuration of the card. This argument must be enclosed in parenthesis and  
within the argument, any or all of the following parameters may be specified using a comma  
(no spaces) to separate each parameter:  
s socket  
Specifies which PCMCIA socket the IOP-241 must be inserted into for  
this configuration argument to be used. “Socketmust be in the range of 0 - 15.  
This option is always required.  
b address Specifies the base I/ O address of the IOP-241 in hexadecimal. Address”  
must reside on an even 8-byte boundary (I/ O base address must end in '0' or '8').  
The valid range for the IOP-241s base address is 100H to 3F8H.  
Specify only one of the following options: “b address’ or r.  
Use of one of these options is always required.  
i irq  
Specifies the interrupt level (IRQ) of the IOP-241 in decimal. Irqmust be  
one of the following values: 3, 4, 5, 7, 9, 10, 11, 12, 14, 15, or 0 if no IRQ is desired.  
This option is required if the 'r' option is not used.  
w address Specifies the base address of the memory window required to configure  
the IOP-241. Set address = D0 for a memory window at segment D000,  
address = D8 for a memory window at segment D800, etc. Valid settings  
for address are C8, CC, D0, D4, D8 and DC. If this option is omitted, a  
memory window at segment D000 will be used.  
Before removing an IOP-241 from its PCMCIA socket, the Enabler should be executed to free  
the system resources allocated when the card was installed. For this operation the Enabler  
provides on additional command line option:  
r
Instructs the Client Driver to release the resources previously allocated to the  
IOP-241. When the 'r' option is used, any settings specified by the 'b', 'i', 'u' and 'e'  
options are ignored. Specify only one of the following options: b address’ or r.  
Use of one of these options is always required.  
2.2.2.1 Example 1  
DEVICE=C:\ IOP241EN.EXE  
No command line argument is specified. The Enabler will report an error and display the  
proper usage of the command.  
2.2.2.2 Example 2  
DEVICE = C:\ IOP241EN.EXE (s0,b300,i5)  
The Enabler will configure the IOP-241 in socket 0 with a base address of 300H and IRQ 5  
using a configuration memory window at segment D000.  
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2.2.2.3 Example 3  
DEVICE = C:\ IOP241EN.EXE (i10,b340,s1)  
The Enabler will configure the IOP-241 in socket 1 with a base address of 340H and IRQ 10  
using a configuration memory window at segment D000. Note that the parameter order is not  
significant.  
2.2.2.4 Example 4  
DEVICE = C:\ IOP241EN.EXE (s0,b300,i3,wd8)  
The Enabler will configure the IOP-241 in socket 0 with a base address of 300H and IRQ 3  
using a configuration memory window at segment D800.  
2.2.2.5 Example 5  
DEVICE = C:\ IOP241EN.EXE (s0,b300,i5,r)  
The Enabler will release the configuration used by the IOP-241 in socket 0 using a  
configuration memory window at segment D000. The base address and IRQ parameters are  
ignored and may be omitted.  
2.2.2.6 Example 6  
DEVICE = C:\ IOP241EN.EXE (s1,r,wcc)  
The Enabler will release the configuration used by the IOP-241 in socket 1 using a  
configuration memory window at segment CC00.  
2.2.3  
Common Problems  
2.2.3.1 Memory Range Exclusion  
The Enabler requires a region of high DOS memory when configuring an IOP-241. This  
region is 1000H bytes (4KB) long and by default begins at address D0000H (the default  
address may be changed using the "W" option). If a memory manager such as EMM386,  
QEMM or 386Max is installed on the system, this region of DOS memory must be excluded  
from the memory manager's control. Consult the documentation provided with the memory  
manager software for instructions on how to exclude this memory region.  
Furthermore, some systems use the high memory area for BIOS shadowing to improve overall  
system performance. In order for the Enabler to operate, any BIOS shadowing must be  
disabled in the address range specified for the configuration window. BIOS shadowing can  
usually be disabled through the system's CMOS setup utility.  
2.2.3.2 Socket Numbers  
The Enabler requires the IOP-241's socket number to be specified on the command line and  
the IOP-241 must be inserted into the socket before the Enabler is invoked. Some vendors  
number their sockets from 1 to N while other vendors number their sockets from 0 to N-1. For  
the IOP-241 Enabler, the lowest socket number in the system is designated socket 0.  
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2.2.3.3 Card and Socket Services Software  
In order to use the IOP-241 Enabler for DOS, the system MUST NOT be configured with Card  
and Socket Services software. If Card and Socket Services software is installed, the IOP-241  
Enabler may interfere with its operation and with the device(s) it controls. For systems  
configured with Card and Socket Services, the IOP-241 Client Driver is the recommended  
method of configuration.  
2.3  
After Completing Configuration  
The IOP-241 is now configured and ready for use. Depending on the type of application  
software to be used, the user may wish to review one or more of the following:  
1. Chapter 4 of this document provides a basic theory of operation of the card for users  
that wish to learn the technical details about the operation of the IOP-241.  
2. For users that want to program the IOP-241 with direct I/ O transfers to the cards  
register set, Chapter 5 provides an address map and a detailed description of each  
I/ O register.  
3. Users that wish to write custom application software without programming the  
IOP-241 directly should consult the DAQDRIVE software reference manual.  
DAQDRIVE provides a library of data acquisition subroutines and is included free  
of charge with the IOP-241.  
4. For third party data acquisition software such as LabTech Notebook®, LabVIEW®,  
TestPoint® or SnapMaster®, consult the documentation provided by the software  
manufacturer.  
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3. Windows 95/98® Installation  
To allow easy configuration of the IOP-241, a Windows 95/ 98 "INF" configuration file has  
been written for the hardware, (DAQPCARD.INF).  
3.1  
Installing the IOP-241 Under Windows 95/98  
1. Insert the IOP-241 into any available PC Card socket.  
2. The first time a new PC Card type is installed the New Hardware Found window  
opens. After this first installation Windows 95/ 98 will automatically detect and  
configure the card. If the New Hardware Found window does not open, then skip  
to the next section, “IOP-241 Resource Settings".  
3. The New Hardware Found window provides several options to configure the  
IOP-241 card. Click the "Driver from Disk" option button. Click "OK" to continue.  
4. An "Install from Disk" dialog box should appear. Insert the customer software  
CD-ROM, select the correct drive letter and path for the configuration file  
(DAQPCARD.INF) and click "OK". Windows 95/ 98 will browse the path for the  
aforementioned file.  
The IOP-241 should now be configured. In the future, Windows 95/ 98 will automatically  
recognize and configure the IOP-241.  
3.2  
Resource Settings in Windows 95/98  
Windows 95/ 98 maintains a registry of all known hardware installed in the computer. Inside  
this hardware registry Windows 95 keeps track of all computer resources, such as base I/ O  
addresses, IRQ levels and DMA channels. In the case of a PC Card (PCMCIA), Windows  
95/ 98 configures the new hardware using free resources it finds within the hardware registry  
and then updates the registry automatically.  
To view and/ or edit hardware devices in Windows 95/ 98 use the system Device Manager.  
To access Device Manager double click the System icon in the Windows 95/ 98 Control Panel  
or click the My Computer icon on the Windows 95/ 98 desktop with the right mouse button  
and select Properties from the pull down menu. Consult Windows 95/ 98 on-line help for  
details on using the Device Manager.  
3.2.1  
Viewing Resource Settings with Device Manager  
1. Start the Device Manager.  
2. Double click on the hardware class Data_Acquisition to list hardware devices in  
the class. The IOP-241 belongs to this hardware class. The device name for the  
IOP-241 is Omega IOP-241 : PCMCIA Digital I/O Card.  
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3. Open the Properties dialog box for the IOP-241, then click the Resources tab to view  
the Input/ Output Range and Interrupt Request resource allocations, (see Figure  
3-1).  
4. To access the IOP-241, use these system resources allocated by Windows 95/ 98 or  
see Changing Resource Settings with Device Manager.  
3.3  
Changing Resource Settings with Device Manager  
1. Start the Windows 95/ 98 Device Manager.  
2. Double click on the hardware class Data_Acquisition to list hardware devices in  
the class. The IOP-241 belongs to this hardware class. The device name for the  
IOP-241 is Omega IOP-241: PCMCIA Digital I/O Card.  
3. Open the Properties dialog box for the IOP-241, then click the Resources tab to view  
the Input/ Output Range and Interrupt Request resource allocations.  
Figure 3-1. Windows 95/ 98 Resource Settings  
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5. To modify either of the resource settings click the resource name and click the  
Change Setting button.  
6. An Edit Resource window will open. Inside the Edit Resource window click on the  
up/ down arrows to the right of the resource value. This scrolls you through all of the  
allowable resources for your hardware. Pay attention to the Conflict Information at the  
bottom of the window. Do not select a resource that causes a conflict with any other  
installed hardware.  
7. Repeat the above steps to modify all of the resources allocated to the IOP-241. Once  
satisfied with the settings make a note of the new settings and click the OK button to  
accept. Clicking the Cancel button does not save your changes.  
If any changes have been made to the IOP-241 configuration, the card will automatically be  
reconfigured to the new resources specified. Any time a PCMCIA card of this type is inserted,  
Windows 95/ 98 will attempt to configure the card at these resource settings. Click the Use  
Automatic Settings box to reset this card type for automatic configuration, (see Figure 3-1).  
3.4  
After Completing Configuration  
The IOP-241 is now configured and ready for use. Depending on the type of application  
software to be used, the user may wish to review one or more of the following:  
1. Chapter 4 of this document provides a basic theory of operation of the card for users  
that wish to learn technical details about the operation of the IOP-241.  
2. For users that want to program the IOP-241 with direct I/ O transfers to the cards  
register set, Chapter 5 provides an address map and a detailed description of each  
I/ O register.  
3. Users that wish to write custom application software without programming the  
IOP-241 directly should consult the DAQDRIVE software reference manual.  
DAQDRIVE provides a library of data acquisition subroutines and is included free  
of charge with the IOP-241.  
4. For third party data acquisition software such as LabTech Notebook®, LabVIEW®,  
TestPoint® or SnapMaster®, consult the documentation provided by the software  
manufacturer.  
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4. Theory of Operation  
4.1  
I/O Port Description  
The 24 digital I/ O channels provided by the IOP-241 are grouped into three different ports  
with each port containing eight digital I/ O channels. These three ports are controlled via the  
Data Port A Control Register, Data Port B Control Register and Data Port C Control Register.  
In all three registers, each bit corresponds to one data line. The Data Port A Control Register  
is used to access data lines DATA7 - DATA0. The Data Port B Control Register is used to  
access data lines DATA15 - DATA8. The Data Port C Control Register is used to access data  
lines DATA23 - DATA16.  
All of the 24 I/ O channels (DATA23 - DATA0) may be individually programmed for either  
input or output. Each data port is latched on a write to that particular port. Each I/ O channel  
may be programmed for input by writing a '1' to the appropriate bit in the corresponding data  
port control register. The I/ O channels are driven by an open-collector driver, therefore  
writing a '1' will turn the open-collector output driver 'off'. When 'off', the open-collector  
output driver is tri-stated. Tri-stating the output driver of an I/ O channel will allow that I/ O  
channel to be driven by another device. An I/ O channel which is configured for input may be  
accessed by reading the appropriate data port control register. If a '0' is written to the  
appropriate bit in the corresponding data port control register, the channel may not be used  
as input. The channel will be 'masked' and a '0' will always be read on the channel.  
If an I/ O channel is to be used as output, the appropriate data port control register should be  
written. When a write operation is performed, the data is latched. If a bit is written with a '0',  
the open-collector output driver will be turned 'on' and the I/ O channel will be driven to a  
low voltage state. Writing a '1' to the appropriate bit will turn the open-collector driver 'off',  
but a pull-up resistor will pull the particular I/ O channel to a TTL high voltage level.  
Upon reset of the IOP-241, the three data port control registers are all latched with a value of  
FFh. This forces all 24 open-collector output drivers 'off' upon a system power-up or upon an  
IOP-241 card insertion. Thus, all 24 I/ O channels are configured as input by default. Care  
should be taken prior to programming any of these I/ O channels for output. The  
open-collector drivers should not be turned 'on' (by writing a '0' to the appropriate bit of a  
data port control register) if the I/ O channel is driven by another device. Driving the channel  
low by latching a '0' into a bit of the data port control register may cause damage to the  
peripheral, the host system or the IOP-241 card if the channel is also being driven by a  
peripheral.  
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4.2  
Port C Interrupt Description  
The eight Port C I/ O channels (DATA23 - DATA16) may also be configured as interrupt  
sources. If any of these eight I/ O channels are used to generate an interrupt, the I/ O channel  
must be configured for input by latching the appropriate bit in the Data Port C Control  
Register to '1'. The interrupt must also be enabled by setting the appropriate bit in the Port C  
Interrupt Enable Register. Eight interrupt sources (INT7 - INT0) may be enabled in this  
manner; each of these interrupt sources corresponds to an I/ O channel in Port C.  
The mode of the port C interrupt sources may be configured in one of four possible manners:  
level sensitive active low interrupt, level sensitive active high interrupt, high-to-low transition  
edge sensitive interrupt and low-to-high transition edge sensitive interrupt. The lower nibble  
(4 bits) and upper nibble (4 bits) of the Port C interrupt sources may be configured separately.  
This will allow INT7 - INT4 to be configured for a different mode than INT3 - INT0. These  
modes are configured by writing the Interrupt Mode Control Register.  
Whenever an interrupt is generated due to a Port C interrupt source, the corresponding bit of  
the Interrupt Status Register is set to reflect the cause of the interrupt. This provides a  
mechanism for determining the source of a detected interrupt. The Interrupt Status Register  
will be continually updated as additional interrupt generating conditions appear.  
Writing a '1' to the appropriate bit of the Interrupt Acknowledge Register is the method by  
which interrupts should be acknowledged. After a write to the Interrupt Acknowledge  
Register, another interrupt will be generated if the Interrupt Status Register does not contain a  
value of 00h. Any bit in the Interrupt Status Register which has a value of '1' can be reset to a  
value of '0' if the following two conditions are met: first the corresponding bit in the Interrupt  
Acknowledge Register must be written with a '1' and second, the interrupt generating  
condition must no longer exist. For level sensitive interrupts, an interrupt will be immediately  
generated after the write of the Interrupt Acknowledge Register if the interrupt generating  
condition (active level on Port C interrupt source) remains.  
4.3  
External Interrupt Description  
In addition to the eight Port C interrupt sources, an additional external interrupt source is  
provided in the IOP-241. This external interrupt source is accessed through Pin 29 of the  
external connector. The external interrupt source permits the IOP-241 to be operated with  
24-bit input/ output and one separate interrupt source.  
The Interrupt Mode Control Register provides a means of enabling/ disabling this external  
interrupt, setting the external interrupt mode, reading the status of the external interrupt and  
acknowledging the external interrupt. The functionality of this external interrupt source is  
identical to that described for the Port C interrupt sources in the previous section.  
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5. Register Descriptions  
The program registers of the IOP-241 occupy eight adjacent bytes of I/ O address space. These  
registers must be programmed to control the operation of the IOP-241. The table below lists  
the program registers along with their offsets relative to the I/ O space base address at which  
the IOP-241 is located:  
Offset  
Read/Write  
R/ W  
R/ W  
R/ W  
R/ W  
R/ W  
R
Register  
0
1
2
5
6
7
7
Data Port A Control Register  
Data Port B Control Register  
Data Port C Control Register  
Port C Interrupt Enable Register  
Interrupt Mode Control Register  
Interrupt Status Register  
W
Interrupt Acknowledge Register  
Table 5-1. IOP-241 Program Registers  
Each register of the IOP-241 is discussed in detail in the following sections.  
5.1  
Data Port A Control Register (Base + 0)  
The Data Port A Control Register contains the control bits for I/ O channels DATA0 - DATA7.  
Each I/ O channel may be individually programmed for input by writing a '1' to the  
appropriate bit of this register.  
Bit  
7
Name  
Description  
DATA7  
DATA6  
DATA5  
DATA4  
DATA3  
DATA2  
DATA1  
DATA0  
General Purpose I/ O bit 7  
General Purpose I/ O bit 6  
General Purpose I/ O bit 5  
General Purpose I/ O bit 4  
General Purpose I/ O bit 3  
General Purpose I/ O bit 2  
General Purpose I/ O bit 1  
General Purpose I/ O bit 0  
6
5
4
3
2
1
0
Table 5-2. Data Port A Control Register  
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5.2  
Data Port B Control Register (Base + 1)  
The Data Port B Control Register contains the control bits for I/ O channels DATA8 - DATA15.  
Each I/ O channel may be individually programmed for input by writing a '1' to the  
appropriate bit of this register.  
Bit  
7
Name  
Description  
DATA15  
DATA14  
DATA13  
DATA12  
DATA11  
DATA10  
DATA9  
DATA8  
General Purpose I/ O bit 15  
General Purpose I/ O bit 14  
General Purpose I/ O bit 13  
General Purpose I/ O bit 12  
General Purpose I/ O bit 11  
General Purpose I/ O bit 10  
General Purpose I/ O bit 9  
General Purpose I/ O bit 8  
6
5
4
3
2
1
0
Table 5-3. Data Port B Control Register  
5.3  
Data Port C Control Register (Base + 2)  
The Data Port C Control Register contains the control bits for I/ O channels DATA16 -  
DATA23. Each I/ O channel may be individually programmed for input by writing a '1' to the  
appropriate bit of this register. In addition, any of these eight I/ O channels which are  
programmed for input may also be used to generate interrupts. In order to program an I/ O  
channel as an interrupt source, the Port C Interrupt Enable Register must be set appropriately.  
The I/ O channel must also be programmed for input by writing a '1' to the appropriate bit of  
the Data Port C Control Register.  
Bit  
7
Name  
Description  
DATA23/ INT7  
DATA22/ INT6  
DATA21/ INT5  
DATA20/ INT4  
DATA19/ INT3  
DATA18/ INT2  
DATA17/ INT1  
DATA16/ INT0  
General Purpose I/ O bit 23 and Interrupt Line 7  
General Purpose I/ O bit 22 and Interrupt Line 6  
General Purpose I/ O bit 21 and Interrupt Line 5  
General Purpose I/ O bit 20 and Interrupt Line 4  
General Purpose I/ O bit 19 and Interrupt Line 3  
General Purpose I/ O bit 18 and Interrupt Line 2  
General Purpose I/ O bit 17 and Interrupt Line 1  
General Purpose I/ O bit 16 and Interrupt Line 0  
6
5
4
3
2
1
0
Table 5-4. Data Port C Control Register  
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5.4  
Port C Interrupt Enable Register (Base + 5)  
INT7 - INT0 may be enabled by writing the appropriate bits in the Port C Interrupt Enable  
Register. The corresponding I/ O channel must be configured as an input channel via the Data  
Port C Control Register if an interrupt is to be generated. If an I/ O channel is configured as  
an interrupt source (INT7 - INT0), the I/ O channel continues to be a standard data input  
channel (DATA23 - DATA16) and may be read just as any other input signal is read.  
Bit  
7
Name  
Description  
INT7EN  
INT6EN  
INT5EN  
INT4EN  
INT3EN  
INT2EN  
INT2EN  
INT1EN  
1 = Enables INT7; 0 = Disables INT7  
1 = Enables INT6; 0 = Disables INT6  
1 = Enables INT5; 0 = Disables INT5  
1 = Enables INT4; 0 = Disables INT4  
1 = Enables INT3; 0 = Disables INT3  
1 = Enables INT2; 0 = Disables INT2  
1 = Enables INT1; 0 = Disables INT1  
1 = Enables INT0; 0 = Disables INT0  
6
5
4
3
2
1
0
Table 5-5. Port C Interrupt Control Register  
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5.5  
Interrupt Mode Control Register (Base + 6)  
The mode of both the external interrupt and the Port C interrupts may be controlled with the  
Interrupt Mode Control Register. The upper nibble (4 bits) and lower nibble (4 bits) of the  
Port C interrupts may be configured separately. The external interrupt may also be enabled by  
writing this register. The status of the external interrupt may be read in this register and the  
external interrupt may also be acknowledged by writing the appropriate bit in the Interrupt  
Mode Control Register.  
Bit  
Name  
Description  
7
ExtIntStat(Read)  
ExtIntStat: to read status of external interrupt  
ExtIntAck(Write) ExtIntAck: write acknowledges external interrupt  
6
ExtraIntEn  
1 = external interrupt is enabled  
0 = external interrupt is disabled  
5:4  
ExtIntControl  
These two bits control the mode of the external  
interrupt:  
00 = Level Sensitive Active Low Interrupt  
01 = Level Sensitive Active High Interrupt  
10 = High-to-low Transition Edge Sensitive Interrupt  
11 = Low-to-high Transition Edge Sensitive Interrupt  
3:2  
1:0  
UpperIntCntrl  
LowerIntCntrl  
These two bits control the mode of the Upper Nibble of  
Port C (INT7, INT6, INT5, INT4):  
00 = Level Sensitive Active Low Interrupt  
01 = Level Sensitive Active High Interrupt  
10 = High-to-low Transition Edge Sensitive Interrupt  
11 = Low-to-high Transition Edge Sensitive Interrupt  
These two bits control the mode of the Lower Nibble of  
Port C(INT3, INT2, INT1, INT0):  
00 = Level Sensitive Active Low Interrupt  
01 = Level Sensitive Active High Interrupt  
10 = High-to-low Transition Edge Sensitive Interrupt  
11 = Low-to-high Transition Edge Sensitive Interrupt  
Table 5-6. Interrupt Mode Control Register  
5.6  
Interrupt Status Register (Read Only) (Base + 7)  
On a read, this register provides the interrupt status for the Port C interrupts. This provides a  
mechanism for determining the sources of any pending interrupts. A '1' signals that an  
interrupt generating condition has occurred on the appropriate channel. Interrupts will  
continue to occur until this register has a value of 00h and no interrupt generating conditions  
remain. This register must be 'reset' by acknowledging interrupts via writing the Interrupt  
Acknowledge Register.  
Bit  
Name  
Description  
7:0  
ChanCIntStatus  
The Status of INT7 - INT0 is read  
(Bit 7 = INT7, Bit 6 = INT6, etc...)  
Table 5-7. Interrupt Status Register (Read Only)  
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5.7  
Interrupt Acknowledge Register (Write Only) (Base + 7)  
Writing a '1' to any bit in the Interrupt Acknowledge Register will acknowledge the interrupt  
generating condition which was represented in the corresponding bit of the Interrupt Status  
Register. If a '1' is written to a bit in the Interrupt Acknowledge Register and the  
corresponding interrupt generating condition is not present, then the appropriate bit in the  
Interrupt Status Register will be reset (set to '0').  
Bit  
Name  
Description  
7:0  
ChanCIntAck  
Written to acknowledge INT 7- INT0  
(Bit 7 = INT7, Bit 6 = INT6,etc...)  
Table 5-8. Interrupt Status Register (Write Only)  
5.8  
Summary of Interrupt Source Options  
Two interrupt source options are provided in the IOP-241 and are summarized below:  
(1) Port C Interrupt Sources  
(a)  
(b)  
The following must be programmed:  
(i)  
Channel set for input via Data Port C Control Register.  
(ii)  
Interrupt source enabled via Port C Interrupt Enable Register.  
(iii) Mode selected via Interrupt Mode Control Register.  
Interrupt generated unless Interrupt Status Register is 00h:  
(i)  
Unacknowledged interrupts are represented by a '1' in the  
Interrupt Status Register.  
(ii)  
Interrupt is generated after write of Interrupt Acknowledge Register  
if any interrupts remain unacknowledged.  
(c)  
'1' in Interrupt Status Register is reset to '0' if the following two requirements are  
satisfied:  
(i)  
Interrupt acknowledged by writing appropriate bit in Interrupt  
Acknowledge Register with '1'.  
(ii)  
Condition which caused interrupt is no longer present.  
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(2)  
External Interrupt Source  
(a)  
The following must be programmed:  
(i)  
(ii)  
Interrupt source enabled via Interrupt Mode Control Register.  
Mode selected via Interrupt Mode Control Register.  
(b)  
(c)  
Interrupt generated if ExtIntStat of Interrupt Mode Control Register is '1'.  
'1' in ExtIntStatus is reset to '0' if the following two requirements are satisfied:  
(i)  
(ii)  
Interrupt acknowledged by writing ExtIntAck with '1'.  
Condition which caused interrupt is no longer present.  
5.9  
Summary of Input/Output Options  
Each of the three ports (Port A, Port B, Port C) may be configured in one of three manners:  
(1)  
PORT USED AS AN OUTPUT  
(a)  
(b)  
Write a '1' to the appropriate bits of the latch in order to turn 'off' the output  
module.  
Write a '0' to the appropriate bits of the latch in order to turn 'on' the output  
module.  
(2)  
(3)  
PORT USED AS AN INPUT  
(a)  
Writing a '1' to all the bits of the latch will allow all the channels of the port to be  
read as inputs. (Writing a '0' to any bits of the latch will 'mask' those bits. Those  
bits will always be read as a '0').  
PORT USED AS INPUT AND OUTPUT  
If a port is to be used so that some channels are inputs and some channels are outputs, it must  
be insured that the channels to be used as inputs are initialized as inputs. This is done by  
writing a '1' to the bits of the data port control register representing the I/ O channels which  
are to be used as inputs anytime the port is written.  
(a)  
(b)  
(c)  
The channels which are to be inputs should always be written with a '1' and  
never written with a '0'.  
The channels which are to be outputs should be written with the appropriate  
value ('0' or '1').  
The channels which are latched with a '0' will always be '0' when read (they are  
'masked' from input).  
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5.10  
Programming Example  
The following C program segment demonstrates how to program an IOP-241 located at I/ O  
base address 300h. Port A will be programmed as output, and 55h will be latched at Port A.  
Port B will be configured with it's upper 3 bits as output and it's lower five bits as input. The  
upper three bits will be latched with 010b. Port C will be configured as input. Interrupts will  
be enabled as explained in the program comments.  
outp(0x300,0x55);  
outp(0x301,0x5F);  
/ * writes 55h to Port A */  
/ * writes 010b to Port B upper 3 bits*/  
/ * sets Port B lower 5 bits for input */  
outp(0x302,0xFF);  
/ * initializes Port C for input */  
Port_B = inp(0x301); / * reads data from Port B */  
/ * Port_B(bit7) = '0' and Port_B(bit5) = '0' due to 'masking' */  
Port_C = inp(0x302); / * reads data from Port C */  
outp(0x306,0x76);  
/ * INT7 - INT4 set for Level Sensitive Active High Interrupt Mode */  
/ * INT3 - INT0 set for Edge Sensitive High-to-low Transition Interrupt Source */  
/ * External Interrupt Source Enabled */  
/ * External Interrupt Source set for Low-to-high Edge Sensitive Interrupt Source*/  
outp(0x305,0x77);  
/ * Enables six Port C interrupt sources */  
/ * Enables INT6,INT5,INT4,INT2,INT1,INT0 */  
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6. External Connections  
The IOP-241 is fitted with a 33-pin 0.8mm shielded connector with the pins assigned as shown  
in Figure 6-1 below.  
1
GND  
DATA0  
DATA1  
DATA2  
DATA3  
DATA4  
DATA5  
DATA6  
DATA7  
GND  
5
10  
15  
20  
25  
DATA8  
DATA9  
DATA10  
DATA11  
DATA12  
DATA13  
DATA14  
DATA15  
GND  
DATA16/ INT0  
DATA17/ INT1  
DATA18/ INT2  
DATA19/ INT3  
DATA20/ INT4  
DATA21/ INT5  
DATA22/ INT6  
DATA23/ INT7  
GND  
EXT_IRQ  
30  
33  
GND  
GND  
GND  
GND  
Figure 6-1. IOP-241 33-Pin Connector  
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7. Optional Accessories  
7.1 CP-1037 Cable Assembly  
An optional cable assembly, Omega product number CP-1037, is available to convert the  
IOP-241's 33-pin 0.8mm I/ O connector to a standard D-37 male connector. The first 31  
connections on the IOP-241 map directly to the first 31 pins of the D37 connector. Note that  
two of the IOP-241 ground connections (pins 32 and 33) are not available when using the  
CP-1037. Figure 7-1 illustrates the D37 connector pin assignments.  
19  
GND  
37  
N/ C  
18  
DATA15  
36  
N/ C  
17  
DATA14  
35  
N/ C  
16  
DATA13  
34  
N/ C  
15  
DATA12  
33  
N/ C  
14  
13  
12  
11  
10  
9
DATA11  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
N/ C  
DATA10  
DATA9  
DATA8  
GND  
GND  
GND  
EXT_IRQ  
GND  
DATA7  
DATA6  
DATA23/ INT7  
DATA22/ INT6  
DATA21/ INT5  
DATA20/ INT4  
DATA19/ INT3  
DATA18/ INT2  
DATA17/ INT1  
DATA16/ INT0  
8
7
DATA5  
DATA4  
DATA3  
DATA2  
DATA1  
DATA0  
GND  
6
5
4
3
2
1
Figure 7-1. CP-1037 D37 Pin Assignments  
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7.2 UIO-37 Screw Terminal Block  
The UIO-37 Screw Terminal Block shown in Figure 7-2 connects directly to the optional  
CP-1037 cable assembly to provide users with a screw terminal interface. The D37 connector of  
the CP-1037 connects directly to the 37 screw terminal blocks of the UIO-37. Each screw  
terminal is numbered for easy reference.  
NOTE:  
Since only the first 31 connections on the IOP-241 are available on the CP-1037 cable assembly,  
two of the IOP-241's ground connections (pins 32 and 33) are not available when using the  
UIO-37.  
Figure 7-2. UIO-37 Screw Terminal Block  
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8. Specifications  
Bus Interface  
Physical Dimensions  
PCMCIA PC Card Standard 2.1 compliant  
Type II PCMCIA card (5mm)  
Power Requirements  
Digital Input/Output  
+5 volts 7.33 mA Typical (all outputs 'off')  
12.38 mA Maximum (all outputs 'off')  
36.38 mA Maximum (all outputs 'on')  
TTL Compatible  
Current Source/Sink  
Sink 6mA(min) at 0.33V  
(at 25° C)  
Sink 20mA(max) at 1.0V  
Source 1.1mA (max) into 0at Vcc = 5V  
Input/Output Current  
Connector  
25mA Maximum  
Adapter to standard male D37  
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IOP-241 Users Manual  
Version 2.30  
January 25, 1999  
Part No. 940-0077-230  
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