Quatech Switch QSCLP 100 User Guide

QSC(LP)-100  
Four Channel Low Profile RS-232  
Asynchronous Communications Adapter  
for PCI bus  
User's Manual  
QUATECH, INC.  
5675 Hudson Industrial Parkway  
Hudson, Ohio 44236  
TEL: (330) 655-9000  
FAX: (330) 655-9010  
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2006, Quatech, Inc.  
NOTICE  
The information contained in this document cannot be reproduced in any  
form without the written consent of Quatech, Inc. Likewise, any software  
programs that might accompany this document can be used only in accordance  
with any license agreement(s) between the purchaser andQuatech, Inc. Quatech,  
Inc. reserves the right to change this documentation or the product to which it  
refers at any time and without notice.  
The authors have taken due care in the preparation of this document and  
every attempt has been made to ensure its accuracy and completeness. In no event  
will Quatech, Inc. be liable for damages of any kind, incidental or consequential,  
in regard to or arising out of the performance or form of the materials presented in  
this document or any software programs that might accompany this document.  
Quatech, Inc. encourages feedback about this document. Please send any  
written comments to the Technical Support department at the address listed on the  
cover page of this document.  
DOS, Windows 95/98/2000/ME, Windows NT are trademarks or registered trademarks of  
Microsoft Corporation. OS/2 is a registered trademark of IBM Corporation. All other trademarks  
or registered trademarks are property of their respective owners.  
iii  
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Declaration of Conformity  
Manufacturer's Name:  
Quatech Inc.  
Manufacturer's Address:  
5675 Hudson Industrial Parkway  
Hudson, Ohio 44236 (USA)  
Application of Council Directive:  
89/336/EEC  
Standards to which  
Conformity is Declared:  
* EN50081-1 (EN55022,  
EN60555-2, EN60555-3)  
* EN50082-1 (IEC 801-2,  
IEC 801-3, & IEC 801-4)  
Type of Equipment:  
Equipment Class:  
Product Name:  
Information Technology  
Equipment  
Commercial, Residential, & Light  
Industrial  
PCI Quad Serial Communications  
Card  
Model Number :  
QSC(LP)-100  
iv  
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1 General Information  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
2 Hardware Configuration  
. . . . . . . . . . . . . . . . . . . . . . . . . 8  
. . . . . . . . . . . . . . . . . . . . . . . 8  
2.1 Factory Default Configuration  
2.2 Enable Scratchpad Register (SPAD, J2)  
. . . . . . . . . . . . . . 8  
2.3 Force High-Speed UART Clock (X2, X4, or X8,  
J3-J5)  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
3 Hardware Installation  
. . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
4 Address Map and Special Registers  
. . . . . . . . . . . 12  
. . . . . . . . . . . . . 12  
4.1 Base Address and Interrupt Level (IRQ)  
4.2 Enabling the Special Registers  
. . . . . . . . . . . . . . . . . . . . . . 13  
4.3 Interrupt Status Register  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
4.4 Options Register  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
4.4.1 Enhanced Serial Adapter Identification  
. . . . . . . . . . . 14  
4.4.2 Clock Rate Multiplier  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
5 Windows Configurations  
. . . . . . . . . . . . . . . . . . . . . . . . 16  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
5.1 Windows Millennium  
5.2 Windows 2000  
5.3 Windows 98  
5.4 Windows 95  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
5.5 Using the "New Hardware Found" Wizard  
5.6 Viewing Resources with Device Manager  
. . . . . . . . . . 19  
. . . . . . . . . . . . 21  
5.6.1 Changing Resource Settings with Device Manager  
. 24  
6 Other Operating Systems  
. . . . . . . . . . . . . . . . . . . . . . . 30  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
6.1 Windows NT  
6.2 OS/2  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
6.3 DOS and other operating systems  
. . . . . . . . . . . . . . . . . . . 30  
6.3.1 QTPCI.EXE  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
7 External Connections  
8 PCI Resource Map  
9 Specifications  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 33  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
10 Troubleshooting  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
QSC(LP)-100 User's Manual  
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1 General Information  
The Quatech, Inc. QSC(LP)-100 provides four RS-232 asynchronous serial  
communication interfaces for Low Profile IBM-compatible personal computer  
systems using the PCI expansion bus. The QSC(LP)-100 uses Quatech's new  
Enhanced Serial Adapter design. Legacy serial port data rates are limited to a  
maximum of 115,200 bits per second. Quatech Enhanced Serial Adapters can  
achieve data rates as high as 921,600 bits per second.  
As a PCI device, the QSC(LP)-100 requires no hardware configuration.  
The card is automatically configured by the computer's BIOS or operating system.  
The four serial ports share a single interrupt line and are addressed in a  
contiguous block of 32 bytes. A special interrupt status register is provided to  
help software to manage the shared interrupt.  
The QSC(LP)-100's serial ports are implemented using 16550 Universal  
Asynchronous Receiver/Transmitters (UARTs). These UARTs contain hardware  
buffers (FIFOs) which reduce processing overhead and allow higher data rates to  
be achieved.  
The QSC(LP)-100 is supported under several popular operating systems  
and environments. Contact the sales department for details on current software  
offerings. Most device drivers are available for download from the Quatech world  
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2 Hardware Configuration  
The QSC(LP)-100 is automatically configured at boot time by the  
computer's BIOS or operating system. There are no required switches or jumpers  
to set for installation.  
This chapter lists a number of optional jumper settings that control various  
hardware features. Jumpers J2-J5 are grouped together at the end of the board  
opposite the HD-44 connector. Any changes from the factory default should be  
made before installing the QSC(LP)-100 in the computer.  
2.1 Factory Default Configuration  
Figure 2 shows the jumper configuration as shipped from the factory, with  
two spare jumpers applied in neutral positions. Remove one or both and apply as  
shown in following sections to set optional features.  
SPAD  
X8  
J2  
J3  
J4  
X4  
X2  
J5  
Figure 2 --- Factory default jumper configuration  
2.2 Enable Scratchpad Register (SPAD, J2)  
In the default configuration, an Interrupt Status Register (see section 4.3)  
and an Options Register (see section 4.4) replace the scratchpad (base address + 7)  
of each UART. If the SPAD jumper is applied as in Figure 3, the UART  
scratchpad registers are enabled, and the Interrupt Status Register and the Options  
Register are not available.  
SPAD  
X8  
J2  
J3  
J4  
J5  
X4  
X2  
Figure 3 --- Enable scratchpad registers  
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2.3 Force High-Speed UART Clock (X2, X4, or X8, J3-J5)  
These jumpers force an increase of the UART input clock frequency by a  
factor of two, four, or eight. This feature can allow legacy software to use baud  
rates above 115,200 bits per second. It is also useful if the serial port device  
driver does not directly support setting the higher baud rates through the Options  
Register (see section 4.4).  
If one of these jumpers is applied, it overrides any value written to the  
Options Register to set the clock multiplier by software. The effective baud rate  
will be either two, four, or eight times the value for which the UART itself is  
programmed.  
The factory default is none of these jumpers applied, which allows for  
software control of the clock multiplier via the Options Register. The Options  
Register powerup default is for a standard times-1 clock of 1.8432 MHz for  
compatibility with standard serial ports.  
SPAD  
X8  
J2  
J3  
J4  
J2  
J3  
J4  
SPAD  
X8  
X4  
X4  
X2  
X2  
J5  
J5  
Force times-two clock  
Baud rates up to 230.4 kbps  
Factory default  
software control  
J2  
J3  
J4  
J2  
SPAD  
SPAD  
X8  
X4  
X2  
X8  
X4  
X2  
J3  
J4  
J5  
J5  
Force times-eight clock  
Force times-four clock  
Baud rates up to 460.8 kbps  
Baud rates up to 921.6 kbps  
Figure 4 --- Clock multiplier jumper options  
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3 Hardware Installation  
1. Turn off the power of the computer system in which the QSC(LP)-100 is  
to be installed.  
2. Remove the system cover according to the instructions provided by the  
computer manufacturer.  
3. Make any desired optional jumper setting changes.  
4. Install the QSC(LP)-100 in any empty PCI expansion slot. The board  
should be secured by installing the Option Retaining Bracket (ORB)  
screw.  
5. Replace the system cover according to the instructions provided by the  
computer manufacturer.  
6. Attach and secure the cable connectors to the desired equipment.  
7. Turn on the power of the computer system.  
The output of the QSC(LP)-100 is a 44-pin D-connector. A cable is  
provided to convert the D-44 into four standard male D-9 connectors with all  
control signals provided to each port (RTS, DTR, CTS, DSR, DCD, and RI).  
Clock multiplier/  
scratchpad select  
SPAD  
X8  
X4  
X2  
Figure 5 --- Jumper/connector locations  
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4 Address Map and Special Registers  
This chapter explains how the four UARTs and special registers are  
addressed, as well as the layout of those registers. This material will be of interest  
to programmers writing driver software for the QSC(LP)-100.  
4.1 Base Address and Interrupt Level (IRQ)  
The base address and IRQ used by the QSC(LP)-100 are determined by the  
BIOS or operating system. Each serial port uses 8 consecutive I/O locations. The  
four ports reside in a single block of I/O space in eight byte increments, for a total  
of 32 contiguous bytes, as shown in Figure 6.  
Port  
I/O Address Range  
Serial 1  
Serial 2  
Serial 3  
Serial 4  
Base Address + 0  
Base Address + 8  
to Base Address + 7  
to Base Address + 15  
Base Address + 16 to Base Address + 23  
Base Address + 24 to Base Address + 31  
Figure 6 --- Port Address Map  
All four serial ports share the same IRQ. The QSC(LP)-100 signals a  
hardware interrupt when any port requires service. The interrupt signal is  
maintained until no port requires service. Interrupts are level-sensitive on the PCI  
bus.  
The base address and IRQ are automatically detected by the device drivers  
Quatech supplies for various operating systems. For cases where no device driver  
is available, such as for operation under DOS, Quatech supplies the "QTPCI"  
DOS software utility for manually determining the resources used. Seesection  
6.3.1 for details.  
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4.2 Enabling the Special Registers  
The QSC(LP)-100 contains two unique registers, an Interrupt Status  
Register and an Options Register. These registers are enabled when the SPAD  
jumper (J6) is removed (factory default). They replace theUART Scratchpad  
Register on accesses to register address 7.  
The Interrupt Status Register and Options Register are accessed through  
the scratchpad location of any UART. The DLAB bit of the UART (Line Control  
Register, bit 7) is used to select between the two registers. The most recent write  
of a DLAB bit in any UART selects between the two registers as shown in Figure  
7.  
Register selected for  
DLAB Bit SPAD Jumper  
address 7 accesses  
0
1
X
removed  
removed  
applied  
Interrupt Status Register  
Options Register  
Scratchpad Registers  
Figure 7 --- DLAB bit selects between special registers  
4.3 Interrupt Status Register  
The read-only Interrupt Status Register can be used to quickly identify  
which serial ports require servicing after an interrupt. Reading the Interrupt Status  
Register will return the interrupt status of the entire QSC(LP)-100, as shown in  
Figure 8. The individual bits are cleared as the interrupting ports are serviced.  
The interrupt service routine should ensure that the interrupt status register reads  
zero before exiting.  
Bit  
Description  
0 (not used)  
7 (MSB)  
6
5
4
3
2
1
0
0 (not used)  
0 (not used)  
0 (not used)  
Port 4 --- 1 if interrupt pending  
Port 3 --- 1 if interrupt pending  
Port 2 --- 1 if interrupt pending  
Port 1 --- 1 if interrupt pending  
Figure 8 --- Interrupt Status Register  
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4.4 Options Register  
The Options Register allows software to identify the QSC(LP)-100 as a  
Quatech Enhanced Serial Adapter. It also allows software to set the UART clock  
rate multiplier. Figure 9 shows the structure of the Options Register.  
The powerup default of the Options Register is all bits zero.  
Bit  
Name  
Description  
ID bit 1  
7 (MSB)  
ID1  
6
5
4
3
2
1
0
ID0  
ID bit 0  
-
(reserved, 0)  
-
-
(reserved, 0)  
(reserved, 0)  
-
(reserved, 0)  
RR1  
RR0  
Clock rate multiplier bit 1  
Clock rate multiplier bit 0  
Figure 9--- Options Register bit definitions  
4.4.1 Enhanced Serial Adapter Identification  
The ID bits are used to identify the QSC(LP)-100 as a Quatech Enhanced  
Serial Adapter. Logic operations are performed such that the values read back  
from these bits will not necessarily be the values that were written to them. Bit  
ID1 will return the logical-AND of the values written to ID[1:0], while bit ID0  
will return their exclusive-OR.  
Software can thus identify a Quatech Enhanced Serial Adapter by writing  
the ID bits with the patterns shown in the "write" column of Figure 10, then  
reading the bits and comparing the result with the patterns in the "read" column.  
Matching read patterns verify the presence of the Options Register.  
Write  
Read  
ID1 ID0 ID1 ID0  
0
0
1
1
0
1
0
1
0
0
0
1
0
1
1
0
Figure 10 --- ID bit write/read table  
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4.4.2 Clock Rate Multiplier  
A standard RS-232 serial port operates at a clock speed of 1.8432 MHz.  
In order to achieve higher data rates, Quatech Enhanced Serial Adapters can  
operate at two times, four times or even eight times this standard clock speed.  
This is controlled by the clock rate multiplier bits in the Options Register.  
Software can determine the UART clock frequency by reading the clock  
rate multiplier bits RR1 and RR0 in the Options Register as shown in Figure 11.  
RR1 and RR0 can be set by writing to the Options Register if the X2, X4, and X8  
jumpers (J3-J5) are all removed. If one of these jumpers is applied, the RR1 and  
RR0 bits are forced to the appropriate value. Reading the Options Register will  
always return the clock rate multiplier at which the board is operating.  
Clock Rate  
Multiplier  
X1  
(default)  
X2  
UART Clock  
Frequency  
Maximum Data  
Rate  
RR1 RR0  
0
0
1.8432 MHz  
115.2 kbaud  
0
1
1
1
0
1
3.6864 MHz  
7.3728 MHz  
14.7456 MHz  
230.4 kbaud  
460.8 kbaud  
921.6 kbaud  
X4  
X8  
Figure 11 --- Rate Register bit definition  
At powerup and reset, the Options Register is initialized to 0. The  
QSC(LP)-100 will thus powerup in the x1 mode with software control of the  
clock rate multiplier enabled as long as the X2, X4, and X8 jumpers are not  
installed.  
Software can control high baud rates through a combination of changing  
the clock rate multiplier and the UART baud rate divisor. For example, a baud  
rate of 230.4 kbps could be achieved by setting the clock rate multiplier to X2  
mode (or by applying the X2 jumper) and setting a software application for 115.2  
kbps.  
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5 Windows Configurations  
5.1 Windows Millennium  
1. After inserting the QSC(LP)- 100 for the first time the "Add New  
Hardware Wizard" will begin. Select "Search for the best driver for your  
device.". Check the "Removable media" and "Specify location" box.  
Click the "Next" button.  
2. Window will locate the proper INF file and copy the file from the CD.  
Click the "Next" button.  
3. The final dialog screen will verify the file copy from theCD.  
Click the "Finish" button.  
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5.2 Windows 2000  
1.  
After inserting a QSC(LP)-100 for the first time, the "Add New  
Hardware Wizard will appear at start up. Click the "OK" button.  
2. The following dialog box will appear. Insert the Quatech COM CD  
(shipped with the device). Click the "OK" button.  
3.  
4.  
The following dialog box will display the appropriate INF file on the CD  
in the drive. Click the "OK" button.  
Window will copy the INF file from the CD and display a final dialog  
indication that the process is complete. Click the "Finish" button.  
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5.3 Windows 98  
1.  
After inserting a QSC(LP)-100 for the first time, the "Add New  
Hardware Wizard will appear at start up. Click the "Next" button.  
2.  
Select "Search for the best driver for your device".  
Click the "Next" button.  
3.  
On the next dialog, select the "CD-ROM DRIVE" check box. Insert the  
Quatech COM CD (shipped with the device) into the CD-ROM drive.  
Click the "Next" button.  
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4.  
5.  
The following dialog box will display the appropriate INF file on the  
diskette in the drive. Click the "Next" button.  
Window will copy the INF file from the diskette and display a final dialog  
indication that the process is complete. Click the "Finish" button.  
5.4 Windows 95  
Windows 95 maintains a registry of all known hardware installed in your  
computer. Inside this hardware registry Windows 95 keeps track of all of your  
system resources, such as I/O locations, IRQ levels, and DMA channels. The  
"Add New Hardware Wizard" utility in Windows 95 was designed to add new  
hardware and update this registry.  
An "INF" configuration file is included with the QSC(LP)-100 to allow  
easy configuration in the Windows 95 environment.  
5.5 Using the "New Hardware Found" Wizard  
The following instructions provide step-by-step instructions on installing  
the QSC(LP)-100 in Windows 95 using the "New Hardware Found" wizard.  
1. After booting the computer with a newly-installed QSC(LP)-100, the  
"New Hardware Found" dialog box will appear. If you have never  
installed a Quatech PCI communications adapter before, the dialog box  
may simply indicate that it has found a "PCI Card."  
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2. Select the radio button for "Driver from disk provided by hardware  
manufacturer." Click the "OK" button to continue.  
3. An "Install From Disk" dialog box should pop up. Insert the disk with the  
Quatech INF files on it, select the correct drive letter, and click the "OK"  
button. Windows 95 automatically browses the root directory for an INF  
file that defines configurations for Multi-function Adapters. If no INF  
files are found, click the "Browse" button and search the Win95 sub  
directory on the installation disk. You are not required to select the file  
name. After finding the directory containing the INF files, Windows 95  
will choose the correct file.  
4. The "New Hardware Found" dialog box will appear again, this time for an  
"Unknown Device."  
5. Again select the radio button for "Driver from disk provided by hardware  
manufacturer." Click the "OK" button to continue.  
6. Another "Install From Disk" dialog box will pop up. The path should  
already be pointing to the Quatech disk. Click the "OK" button to  
continue.  
7. You should now see the "Copying Files" dialog box as Windows 95 copies  
the driver files from the disk..  
8. The installation utility will ask for your Windows 95 installation disks.  
Serial communication ports require two drivers supplied by Microsoft to  
function: SERIAL.VXD and SERIALUI.DLL. Insert the disk or CD and  
click "OK".  
NOTE:  
You may be able to skip this step if you are certain that your system has the latest  
version of these files installed. If you do not have your Windows 95 install disks  
immediately available, click "OK" anyway. A dialog box appears with an option  
to Skip the files. Click the Skip button and the files will not be installed. This is  
all right if the latest version of these drivers are currently in the  
\WINDOWS\SYSTEM directory.  
9. The "New Hardware Found" dialog will repeat for each of the serial ports  
on the QSC(LP)-100 as each port is registered with Windows 95.  
10. Installation is complete.  
5.6 Viewing Resources with Device Manager  
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The following instructions provide step-by-step instructions on viewing  
resources used by the QSC(LP)-100 in Windows using the "Device Manager"  
utility. Select Start|Help from within Windows for additional information on this  
utility.  
1. Double click the "System" icon inside the Control Panel folder. This  
opens up the System Properties box.  
2. Click the "Device Manager" tab located along the top of the System  
Properties box. This lists all hardware devices registered inside the  
Windows registry. Additional information is available on any of these  
devices by click on the device name and then selecting the "Properties"  
button.  
3. Double click the device group "Multi-function Adapters". The  
QSC(LP)-100 model name should appear in the list of Multi-function  
adapters.  
4. Double click the QSC(LP)-100 model name and a properties box should  
open for the hardware adapter.  
5. Click the "Resources" tab located along the top of the properties box to  
view the resources Windows has allocated for the QSC(LP)-100 match  
the hardware configuration. Because PCI is a true plug-and-play bus,  
do not attempt to modify the configuration values listed. Click  
"Cancel" to exit without making changes.  
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Figure 12--- Windows Device Manager  
6. The QSC(LP)-100 serial ports are also listed under the group Ports (COM  
and LPT). Windows 95 does not assign COM1-COM4 to ports addressed  
at nonstandard locations. The QSC(LP)-100 ports will be enumerated  
starting with COM5 (or higher) even if lower logical numbers are  
available.  
7. Select any of the Quatech Serial Ports listed under the group Port (COM  
and LPT) and click the "Properties" button. This action opens a properties  
dialog for the specific COM port on the QSC(LP)-100.  
8. Click the "Port Settings" tab and then click the "Advanced" button. The  
QSC(LP)-100 driver will display a custom Advanced Port Settings control,  
which allows the ports UART compatibility mode and FIFO threshold  
levels to be configured. The threshold values of full-scale for the transmit  
buffer and 3/4-scale for the receive buffer shown below are optimal for  
most applications. Note that the FIFO option for each of the  
QSC(LP)-100's two ports is configured independently.  
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Figure 13--- Windows Device Manager  
9. Use the Logical COM Port names to access the serial ports on your  
QSC(LP)-100 through your software applications. Note: The Logical  
COM Port name is assigned to your ports by Windows . This name is  
required by a Windows application when accessing a particular port.  
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5.6.1 Changing Resource Settings with Device Manager  
1. Start the Windows 95/98/ME Device Manager.  
2. Double click on the hardware class Multi-Port Serial Adapters to list  
hardware devices in the class.  
3. The QSC(LP)-100 “parent device” belongs to this hardware class. The  
full device name for the QSC(LP)-100 is Quatech QSC(LP)-100:  
Four-Port RS-232 Serial Adapter.  
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4. Open the Properties dialog for the QSC(LP)-100 device, then click the  
Resources tab to view the Input/Output Range and Interrupt Request  
resource allocations. Do not change these settings without specific  
instructions from a Quatech Technical Support Specialist. To exit  
without saving changes, click the “cancel” button.  
5. Open the Properties dialog for the QSC(LP)-100 device, then click the  
Advanced tab to view the clock rate settings.  
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Data Rate Multiplier  
Clock Mode Max bps Description  
Auto clock mode enables applications to  
request any baud rate up to 921,600.  
921,600 The hardware drivers will select the  
correct clock multiplier based on the  
baud rate requested  
The X1 clock mode mimics a standard  
COM port. The hardware drivers lock  
115,200 the clock to the standard rate. The port  
will run at the baud rate requested by  
the application.  
Auto  
X1  
The X2 clock mode locks the ports  
hardware clock at double the standard  
230,400 rate. The baud rate the port runs at will  
always be double the rate requested by  
the applications. This mode is useful  
X2  
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for legacy applicattions which cannot  
request baud rates over 115,200  
The X4 clock mode locks the ports  
hardware clock at four times the  
standard rate. The baud rate the port  
460,800 runs at will always be four times the rate  
requested by the application. This mode  
is useful for legacy applications which  
cannot request baud rates over 115.200.  
The X8 clock mode locks the ports  
hardware clock at eight times the  
X4  
X8  
standard rate. The baud rate the port  
runs at will always be eight times the  
rate requested by the application. This  
921,600  
mode is useful for legacy applications  
which cannot request baud rates over  
115.200.  
6. Double click the hardware class Ports (Com and LPT). Each  
Quatech PCI Serial Port listed in this class is a “child device” of the  
QSC(LP)-100 “parent device.”  
7. Open the Properties dialog for a COM port, then click the Port  
Properties tab to view the settings for that port.  
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8. Click the "Port Settings" tab and then click the "Advanced" button.  
The QSC(LP)-100 driver will display a custom Advanced Port Settings  
control, which allows the ports UART compatibility mode and FIFO  
threshold levels to be configured. The threshold values of full-scale for  
the transmit buffer and ¾-scale for the receive buffer are optimal for  
most applications. Note that the FIFO option for each of the  
QSC(LP)-100's four ports is configured independently.  
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6 Other Operating Systems  
Device drivers for Windows NT and OS/2 are also available for the  
QSC(LP)-100. The board can be used under DOS and other operating systems as  
well in many circumstances. The software described below can be downloaded  
from the Quatech web site if it did not come with the board.  
6.1 Windows NT  
The Windows NT device driver is installed by running the SETUP  
program. Up to 256 serial ports are supported. There is a command line-based  
configuration utility which is used for adding PCI bus and ISA bus serial ports.  
Please refer to the documentation included with the device driver for full  
installation and configuration details.  
6.2 OS/2  
The OS/2 device driver supports up to 32 serial ports in a system.  
Installation is a manual, but simple, process. Please refer to the documentation  
included with the device driver for full installation and configuration details.  
6.3 DOS and other operating systems  
The QSC(LP)-100 is not a direct drop-in replacement for a legacy serial  
port because its base address and IRQ cannot be fixed at values such as 3F8 hex,  
IRQ 4 (COM1) or 2F8 hex, IRQ 3 (COM2), etc. Rather, the system BIOS assigns  
the address and the IRQ in a plug-and-play fashion at boot time. Software which  
is to use the QSC(LP)-100 must be able to accommodate any valid assignments of  
these resources.  
For Windows 95/98/2000/ME, Windows NT and OS/2, the Quatech  
device drivers determine what the resource assignments are and proceed  
accordingly. In other cases, however, the user must intervene. The discussion  
below will center on DOS, but the concepts can be applied to other operating  
systems as well.  
Many DOS applications support user configuration of the base address and  
IRQ of a serial port. Such applications can generally make use of the  
QSC(LP)-100. Older applications, as well as some custom software, may use  
hard-coded standard legacy serial port addresses. These applications will require  
modifications if they are to use the QSC(LP)-100.  
Custom applications for which the customer has source code can be  
modified to make just a few PCI BIOS function calls to obtain all the necessary  
configuration information. The PCI BIOS specification can be obtained from the  
PCI Special Interest Group. Contact Quatech technical support for more  
information.  
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6.3.1 QTPCI.EXE  
Quatech's "QTPCI" utility supplies the information required when  
modifying the serial port settings of the application. This program should be run  
from real DOS, not in a Windows DOS box.  
Figure 14 shows the Basic Mode display for the QSC(LP)-100 after the  
"Q" key has been pressed. In this example, the QSC(LP)-100 uses I/O base  
address FF80 hex and IRQ 11. The hardware revision of the QSC(LP)-100 is also  
displayed. Pressing the "N" key will show similar information for all  
non-Quatech PCI devices in the system, including those devices integrated on the  
motherboard.  
The QTPCI program is capable only of displaying the PCI configuration. It  
cannot be used to make changes.  
Figure 14 --- QTPCI.EXE Basic Mode display  
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Figure 15 shows the Expert Mode display for the QSC(LP)-100 after the  
"Q" key has been pressed. The information from the Basic Mode display is  
presented along with more details such as the Vendor and Device IDs, PCI Class  
Code, size of memory and I/O regions, etc. Pressing the "N" key will show  
similar information for all non-Quatech PCI devices in the system, including those  
devices integrated on the motherboard. In this example, the "Base addr 0"  
resource is reserved.  
For users interested in even more details, PCI BIOS information can be  
displayed by pressing the "B" key. Pressing the "I" key displays thePCI interrupt  
routing table.  
Figure 15 --- QTPCI.EXE Expert Mode display  
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7 External Connections  
RS-232-C devices are classified by their function as either Data Terminal  
Equipment (DTE) or Data Communication Equipment (DCE). Generally, data  
terminal equipment is defined as the communication source and data  
communication equipment is defined as the device that provides a communication  
channel between two DTE-type devices.  
Terminal  
DTE  
Modem  
DCE  
RS-232-C  
RS-232-C  
Telephone  
line  
Terminal  
DTE  
Modem  
DCE  
Figure 16 --- Use of DTEs and DCEs in a communications link  
DTE- and DCE-type devices have complementary pinouts to allow  
terminals and modems to be connected directly using a one-to-one cable as shown  
in Figure 16. In many applications, DCEs are unnecessary, and in these cases a  
cable called a "null modem cable" or "modem eliminator cable" is used to directly  
connect two DTE-type devices. A typical null modem cable is also shown in  
Figure 17.  
(3)  
(2)  
(4)  
(5)  
(20)  
(6)  
(8)  
(22)  
(7)  
(3)  
(2)  
(4)  
(5)  
(20)  
(6)  
(8)  
(22) RI  
(7)  
RxD  
TxD  
RTS  
CTS  
DTR  
DSR  
DCD  
RI  
(3)  
(2)  
(4)  
(5)  
(20)  
(6)  
(8)  
(22)  
(7)  
RxD  
TxD  
(3)  
(2)  
(4)  
(5)  
(20)  
(6)  
(8)  
(22)  
(7)  
RxD  
TxD  
RTS  
CTS  
DTR  
DSR  
DCD  
RI  
TxD  
RxD  
CTS  
RTS  
DSR  
DTR  
DCD  
RI  
RTS  
CTS  
DTR  
DSR  
DCD  
GND  
GND  
GND  
GND  
Typical DTE-to-DCE cable  
Typical DTE-to-DTE null modem cable  
Figure 17 --- Cabling requirements for RS-232-C devices  
(cables using 25-pin connectors shown)  
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The QSC(LP)-100 is a DTE device which connects to peripheral  
equipment through a single female D-44 connector, or using the adapter cable,  
four male D-9 connectors. The standard serial port connections are listed in  
Figure 18.  
Port 1  
Port 2  
Port 3  
Port 4  
RS-232  
Signal  
D-44 D-9 D-44 D-9 D-44 D-9 D-44 D-9  
TxD  
RxD  
RTS  
CTS  
DTR  
DSR  
DCD  
RI  
13  
42  
14  
43  
28  
27  
44  
29  
19  
3
2
7
8
4
6
1
9
5
10  
39  
11  
40  
24  
23  
41  
25  
8
3
2
7
8
4
6
1
9
5
6
3
2
7
8
4
6
1
9
5
2
3
2
7
8
4
6
1
9
5
35  
7
31  
3
36  
21  
20  
37  
22  
26  
32  
17  
16  
33  
18  
30  
GND  
Figure 18 --- QSC(LP)-100 connector pinouts  
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8 PCI Resource Map  
Listed below are the PCI resources used by the QSC(LP)-100. Such  
information may be of use to customers writing their own device drivers or other  
custom software. A detailed description of the QSC(LP)-100's UARTs is  
available on the Quatech web site.  
(all numbers in hex)  
PCI Vendor ID:  
PCI Device ID:  
0x135C  
0x0170  
Quatech, Inc.  
QSC(LP)-100  
PCI Class Code  
Base class:  
Subclass:  
0x07  
0x02  
0x00  
Simple communications controller  
Multiport serial controller  
Interface:  
IRQ sourced by:  
Base address 0:  
Base address 1:  
Base address 2:  
INTA#  
0x80 bytes Memory Reserved region  
0x80 bytes I/O  
0x20 bytes I/O  
Reserved region  
Serial ports:  
Port 1 at offset 0x00  
Port 2 at offset 0x08  
Port 3 at offset 0x10  
Port 4 at offset 0x18  
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9 Specifications  
Bus interface:  
PCI, 32-bit bus, Universal Voltage Signaling  
IBM-compatible computers  
Dimensions:  
approx. 5.0" x 3.7"  
Serial ports  
Controller:  
16550 with 16-byte FIFOs  
Interface:  
One female D-44 connector  
Four male D-9 connectors  
using adapter cable  
Transceivers:  
ICL3245CA  
High-level output:  
Low-level output:  
Switching speed  
+5V min  
-5V max,  
Power requirements  
Temperature:  
Humidity:  
+5.0 volts: approx. 250 mA  
operating 0° to 70°  
storage -50° to 80°  
10% to 90%  
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Maximum Load (pF)  
Data Rate  
(kbaud)  
4%  
trans  
time  
N/A  
100  
330  
800  
10%  
trans  
time  
100  
430  
900  
15%  
trans  
time  
300  
670  
1100  
3300  
20%  
trans  
time  
430  
900  
1630  
4300  
25%  
trans  
time  
470  
1100  
2000  
4800  
921.6  
460.8  
230.4  
115.2  
1570  
Note 1: The signal transition time ratio is defined as the percentage of the  
unit interval or bit time (the inverse of the data rate) that is occupied by the  
signal transitioning from -3V to +3V. The EIA/TIA-232-E standard  
defines a maximum signal transition time ratio of 4%; most RS-232  
receivers will recognize signal transitions with much larger ratios. With a  
4% signal transition time ratio, EIA/TIA-232-E is limited to a theoretical  
data rate of 200 kbaud. If maximum signal transition time ratio is  
extended to 10%, 15%, 20%, or even 25%, the maximum data rate  
achievable using EIA/TIA-232-E can be increased past 200 kbaud.  
Note 2: A typical value for capacitance per foot of standard cable is 50  
pF/ft.  
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10 Troubleshooting  
Listed here are some common problems and frequent causes of those  
problems. If the information here does not provide a solution, contact Quatech  
technical support.  
Any unauthorized repairs or modifications will void the QSC(LP)-100's warranty.  
Computer will not boot up.  
1. Is the QSC(LP)-100 properly inserted? Remove the card and try again.  
Perhaps try a different expansion slot.  
2. Ensure that an ISA-bus card is not using the same IRQ that the PCI BIOS  
tries to assign to the QSC(LP)-100. Most computers have BIOS setup  
options to reserve IRQs for either ISA or PCI use. Try reserving the IRQ  
for the ISA card. The BIOS will automatically choose a different IRQ for  
the QSC(LP)-100. An address conflict is unlikely because most PCI-based  
computers will assign I/O addresses in such a way that they cannot conflict  
with ISA-bus devices.  
3. The QSC(LP)-100 may be defective. Contact technical support for  
instructions.  
Cannot communicate with other equipment.  
1. Are the cable connections correct? Are the cables securely attached?  
2. Is the software configured with the correct base address and IRQ  
information for the QSC(LP)-100? (This is mainly a DOS issue.)  
3. Is the device driver installed?  
4. If you are trying to communicate with another DTE, a null-modem cable  
will be required.  
5. If possible, use a loopback connector to test the port. This connector  
needs to connect the following sets of signals on a D-9 connector:  
TxD and RxD (pins 2 and 3)  
RTS and CTS (pins 7 and 8)  
DCD, DTR, DSR, and RI (pins 1, 4, 6 and 9)  
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QSC(LP)-100  
User's Manual  
Revision 1.12  
November 2006  
P/N: 940-0180-112  
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