Omega OMG COMM8 PCI User Manual

Users Guide  
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OMG-COMM8-PCI  
Eight Port PCI RS-232 Interface Board  
Contents  
INTRODUCTION..........................................................................1  
OVERVIEW................................................................................................ 1  
WHATS INCLUDED................................................................................ 1  
CARD SETUP ..............................................................................2  
CLOCK MODES........................................................................................ 2  
BAUD RATES AND DIVISORS FOR THE ‘DIV1’ MODE ........................ 3  
ADDRESS AND IRQ SELECTION ............................................................ 3  
INSTALLATION ..........................................................................4  
OPERATING SYSTEM INSTALLATION................................................. 4  
For Windows Users ............................................................................ 4  
Other Operating Systems ................................................................... 4  
SYSTEM INSTALLATION........................................................................ 4  
TECHNICAL DESCRIPTION .........................................................5  
CONNECTOR PIN ASSIGNMENTS.......................................................... 5  
DB-25 (RS-232 DTE)  
DB-9 (EIA-574 DTE)  
(DB25 MALE) .......................................... 5  
(DB9 MALE) ............................................ 5  
DB-78 CONNECTOR PIN ASSIGNMENTS  
(DB78 FEMALE) ...... 6  
SPECIFICATIONS ........................................................................7  
ENVIRONMENTAL SPECIFICATIONS.................................................... 7  
POWER CONSUMPTION.......................................................................... 7  
MEAN TIME BETWEEN FAILURES (MTBF) ....................................... 7  
PHYSICAL DIMENSIONS.......................................................................... 7  
APPENDIX A - TROUBLESHOOTING ...........................................8  
PCI COM NUMBER SELECTION IN WINDOWS 95........................ 9  
APPENDIX B - HOW TO GET ASSISTANCE ..............................10  
APPENDIX C - ELECTRICAL INTERFACE...................................11  
RS-232..................................................................................................... 11  
APPENDIX D - ASYNCHRONOUS COMMUNICATIONS ...............12  
APPENDIX E - SILK-SCREEN ....................................................13  
APPENDIX F - COMPLIANCE NOTICES .....................................14  
FEDERAL COMMUNICATIONS COMMISSION STATEMENT............ 14  
EMC DIRECTIVE STATEMENT........................................................... 14  
Figures  
Figure 1 - Clocking Mode ‘Divide By 4’............................................................2  
Figure 2 - Clocking Mode ‘Divide By 1’............................................................2  
Figure 3 - Asynchronous Communications Bit Diagram.............................12  
Introduction  
Introduction  
Overview  
The OMG-COMM8 -PCI provides the PC with eight RS-232 asynchronous ports.  
The OMG-COMM8 -PCI allows for connection to any device utilizing the RS-232  
electrical interface, such as modems, data-entry terminals, and plotters.  
What’s Included  
The OMG-COMM8 -PCI is shipped with the following items. If any of these  
items is missing or damaged, contact the supplier.  
·
·
OMG-COMM8 -PCI Serial I/O Adapter  
DB-78 to eight DB-25 ‘Spider Cable’ (DB-9 Spider Cable is  
available)  
·
·
Serial Utility Software  
User Manual  
OMG-COMM8 -PCI  
Page 1  
Card Setup  
Card Setup  
Clock Modes  
The OMG-COMM8 -PCI employs a unique clocking option that allows the end  
user to select from divide by 4 and divide by 1 clocking modes. This mode is  
selected at J1.  
To select the Baud rates commonly associated with COM: ports (i.e. 2400, 4800,  
9600, 19.2, … 115.2K Bps) place the jumper in the divide by 4 mode (silk-screen  
DIV4).  
Figure 1 - Clocking Mode ‘Divide By 4’  
To select the maximum data rate (460.8K bps) place the jumper in the divide by 1  
(silk-screen DIV1) position.  
Figure 2 - Clocking Mode ‘Divide By 1’  
OMG-COMM8 -PCI  
Page 2  
Card Setup  
Baud Rates and Divisors for the ‘Div1’ mode  
The following table shows some common data rates and the rates you should  
choose to match them if using the adapter in the ‘Div1’ mode.  
For this Data Rate  
1200 bps  
Choose this Data Rate  
300 bps  
2400 bps  
600 bps  
4800 bps  
1200 bps  
9600 bps  
2400 bps  
19.2K bps  
57.6 K bps  
115.2 K bps  
230.4K bps  
460.8K bps  
4800 bps  
14.4K bps  
28.8K bps  
57.6 K bps  
115.2 K bps  
If your communications package allows the use of Baud rate divisors, choose the  
appropriate divisor from the following table:  
For this Data Rate  
1200 bps  
Choose this Divisor  
384  
192  
96  
48  
24  
12  
8
4
2
1
2400 bps  
4800 bps  
9600 bps  
19.2K bps  
38.4K bps  
57.6K bps  
115.2K bps  
230.4K bps  
460.8K bps  
Address and IRQ selection  
The OMG-COMM8 -PCI is automatically assigned I/O addresses and IRQs by  
your motherboard BIOS. Only the I/O address may be modified by the user.  
Adding or removing other hardware may change the assignment of I/O  
addresses and IRQs.  
OMG-COMM8 -PCI  
Page 3  
Installation  
Installation  
Operating System Installation  
For Windows Users  
Start by choosing Install Software at the beginning of the CD. Choose  
Asynchronous COM: Port Software, SeaCOM.  
Other Operating Systems  
Refer to the appropriate section of the Serial Utilities Software.  
System Installation  
The OMG-COMM8 -PCI can be installed in any of the PCI expansion slots and  
contains a single jumper strap that must be set for proper operation. Please see  
the Card Setup section of the manual for information on this jumper.  
1. Turn off PC power. Disconnect the power cord.  
2. Remove the PC case cover.  
3. Locate an available PCI slot and remove the blank metal slot cover.  
4. Gently insert the OMG-COMM8 -PCI into the slot. Make sure that the  
adapter is seated properly.  
5. Replace the screw.  
6. Replace the cover.  
7. Connect the power cord.  
Installation is complete.  
OMG-COMM8 -PCI  
Page 4  
Technical Description  
Technical Description  
The OMG-COMM8 -PCI utilizes the 16C554 UART. This chip features  
programmable baud rate, data format, interrupt control and a 16-byte input and  
output FIFO, and is functionally 4 16C550 UARTs. A full array of advanced  
UARTS is also available for this card. Contact Omega Engineering for more  
information.  
Connector Pin Assignments  
DB-25 (RS-232 DTE)  
(DB25 MALE)  
Signal  
GND  
TD  
RTS  
DTR  
RD  
CTS  
DSR  
DCD  
RI  
Name  
Ground  
Pin #  
7
2
4
20  
3
5
6
8
22  
Mode  
Transmit Data  
Request To Send  
Data Terminal Ready  
Receive Data  
Clear To Send  
Data Set Ready  
Data Carrier Detect  
Ring Indicator  
Output  
Output  
Output  
Input  
Input  
Input  
Input  
Input  
DB-9 (EIA-574 DTE)(DB9 MALE)  
Signal  
GND  
TD  
RTS  
DTR  
RD  
CTS  
DSR  
DCD  
RI  
Name  
Ground  
Pin #  
Mode  
5
3
7
4
2
8
6
1
9
Transmit Data  
Request To Send  
Data Terminal Ready  
Receive Data  
Clear To Send  
Data Set Ready  
Data Carrier Detect  
Ring Indicator  
Output  
Output  
Output  
Input  
Input  
Input  
Input  
Input  
Technical Note: Please terminate any control signals that are not going to be  
used. The most common way to do this is connect RTS to CTS and RI. Also,  
connect DCD to DTR and DSR. Terminating these pins, if not used, will help  
insure  
you  
get  
the  
best  
performance  
from  
your  
adapter.  
OMG-COMM8 -PCI  
Page 5  
Technical Description  
DB-78 Connector Pin Assignments  
(DB78 FEMALE)  
Port #  
TD  
RD  
RTS  
CTS  
DTR  
DSR  
DCD  
RI  
1
2
3
4
3
2
22  
23  
4
21  
1
5
6
7
8
36  
37  
17  
16  
35  
18  
38  
15  
34  
12  
11  
31  
32  
13  
30  
10  
33  
14  
27  
28  
8
7
26  
9
29  
6
25  
75  
76  
56  
55  
74  
57  
77  
54  
73  
51  
50  
70  
71  
52  
69  
49  
72  
53  
66  
67  
47  
46  
65  
48  
68  
45  
64  
42  
41  
61  
62  
43  
60  
40  
63  
44  
24  
5
GND  
OMG-COMM8 -PCI  
Page 6  
Specifications  
Specifications  
Environmental Specifications  
Specification  
Temperature Range  
Operating  
0º to 50º C  
Storage  
-20º to 70º C  
(32º to 122º F)  
10 to 90% R.H.  
Non-Condensing  
(-4º to 158º F)  
10 to 90% R.H.  
Non-Condensing  
Humidity Range  
Power Consumption  
Supply line  
Rating  
+12 VDC  
60 mA  
-12 VDC  
100 mA  
+5 VDC  
295 mA  
Mean Time Between Failures (MTBF)  
Greater than 150,000 hours. (Calculated)  
Physical Dimensions  
Board length  
Board Height including Goldfingers  
Board Height excluding Goldfingers  
5.650 inches  
3.8 inches  
3.475 inches  
(14.351 cm.)  
(9.652 cm.)  
(8.827 cm.)  
OMG-COMM8 -PCI  
Page 7  
Appendix A - Troubleshooting  
Appendix A - Troubleshooting  
Serial Utility test software is supplied with the adapter and will be used in the  
troubleshooting procedures. By using this software and following these simple  
steps, most common problems can be eliminated without the need to call  
Technical Support.  
1. Identify all I/O adapters currently installed in your system. This includes  
your on-board serial ports, controller cards, sound cards etc. The I/O  
addresses used by these adapters, as well as the IRQ (if any) should be  
identified.  
2. Configure your adapter so that there is no conflict with currently installed  
adapters. No two adapters can occupy the same I/O address.  
3. Make sure the adapter is securely installed in a motherboard slot.  
4. When running DOS, Windows 3.x or other operating systems refer to the  
Serial Utilities software for that operating system and the User Manual to  
verify that the adapter is configured correctly. The supplied software  
contains a diagnostic program 'SSD' that runs under DOS and will verify if an  
adapter is configured properly. This diagnostic program is written with the  
user in mind and is easy to use. Refer to the DIAG.txt file in the dos\diag  
directory for detailed instructions on using 'SSD'.  
5. For Windows 95/98 and Windows NT, the diagnostic tool 'WinSSD' is  
installed in the Omega Engineering folder on the Start Menu during the  
setup process. First find the ports using the Device Manager, then use  
'WinSSD' to verify that the ports are functional.  
6. Always use the diagnostic software when troubleshooting a problem. This  
will help eliminate any software issues and identify any hardware conflicts.  
OMG-COMM8 -PCI  
Page 8  
Appendix A - Troubleshooting  
PCI COM NUMBER SELECTION IN WINDOWS 95  
When installing a multi-port PCI card in Windows 95 the default starting COM:  
number assigned to the first port will be COM:5 if no COM:5 exists. If there is a  
COM: 5, 6, etc., the next available COM: number will be assigned to the first port  
with all additional ports following in ascending order.  
To change the first two ports so that Windows assigns them COM: 3 and COM:  
4 port enumeration double click the Systems icon in control panel or right click  
on My Computer and choose properties which will bring you to System  
Properties. Choose the Device Manager tab and double click on the Multi-  
Function Adapter heading. This will show all the information concerning the  
adapter. Choose the Resources tab, which will show all resources assigned to the  
multi-function adapter. Uncheck the Use Automatic Settings box. Notice that  
with a two port card there will be three input/output, (I/O), ranges listed. With a  
four port card there will be five input/output, (I/O), ranges listed. The first I/O  
range is for the PCI bus and should not be changed. The second and third I/O  
ranges are the ones that need to be changed in order to have those ports  
enumerated as COM: 3 and COM: 4. Double click on the second I/O range which  
will allow you to change the address. Highlight the entire I/O range and type:  
03e8–03ef for COM: 3. Click OK. Windows will inform you that you have made  
modifications that may affect other devices. Click OK. Next double click on the  
third I/O range. Highlight the entire I/O range and type: 02e8–02ef for COM: 4.  
Again Windows will inform you that you have made modifications that may  
affect other devices. Click OK.  
Following these steps will change the COM: number assignments on the first two  
ports to  
COM: 3 and 4.  
OMG-COMM8 -PCI  
Page 9  
Appendix B - How To Get Assistance  
Appendix B - How To Get Assistance  
Please refer to Troubleshooting Guide prior to calling Technical Support.  
1. Read this manual thoroughly before attempting to install the  
adapter in your system.  
2. When calling for technical assistance, please have your user  
manual and current adapter settings. If possible, please have the  
adapter installed in a computer ready to run diagnostics.  
3. Omega Engineering maintains a Home page on the Internet. Our  
home page address is www.omega.com. The latest software  
updates, and newest manuals are available via our FTP site that can  
be accessed from our home page.  
4. Technical support is available Monday to Friday from 8:30 a.m. to  
6:00 p.m. eastern time. Technical support can be reached at 1-800-  
DAS-IEEE.  
RETURN AUTHORIZATION MUST BE OBTAINED FROM OMEGA BEFORE  
RETURNED MERCHANDISE WILL BE ACCEPTED. AUTHORIZATION CAN  
BE OBTAINED BY CALLING OMEGA CUSTOMER SERVICE AND  
REQUESTING AN AUTHORIZED RETURN (AR) NUMBER.  
OMG-COMM8 -PCI  
Page 10  
Appendix C - Electrical Interface  
Appendix C - Electrical Interface  
RS-232  
Quite possibly the most widely used communication standard is RS-232. This  
implementation has been defined and revised several times and is often referred  
to as RS-232-C/D/E or EIA/TIA-232-C/D/E. It is defined as Interface between  
Data Terminal Equipment and Data Circuit- Terminating Equipment  
Employing Serial Binary Data Interchange”. The mechanical implementation of  
RS-232 is on a 25-pin D sub connector. The IBM PC computer defined the RS-232  
port on a 9 pin D sub connector and subsequently the EIA/TIA approved this  
implementation as the EIA/TIA-574 standard. This standard has defined as the  
9-Position Non-Synchronous Interface between Data Terminal Equipment and  
Data Circuit-Terminating Equipment Employing Serial Binary Data  
Interchange”. Both implementations are in wide spread use and will be referred  
to as RS-232 in this document. RS-232 is capable of operating at data rates up to  
20K bps / 50 ft. The absolute maximum data rate may vary due to line conditions  
and cable lengths. RS-232 often operates at 38.4K bps over very short distances.  
The voltage levels defined by RS-232 range from -12 to +12 volts. RS-232 is a  
single ended or unbalanced interface, meaning that a single electrical signal is  
compared to a common signal (ground) to determine binary logic states. A  
voltage of +12 volts (usually +3 to +10 volts) represents a binary 0 (space) and -  
12 volts (-3 to -10 volts) denote a binary 1 (mark). The RS-232 and the EIA/TIA-  
574 specification define two types of interface circuits Data Terminal Equipment  
(DTE) and Data Circuit-Terminating Equipment (DCE). The OMG-COMM8-PCI  
adapter is a DTE interface.  
OMG-COMM8 -PCI  
Page 11  
Appendix D - Asynchronous Communications  
Appendix D - Asynchronous Communications  
Serial data communications implies that individual bits of a character are  
transmitted consecutively to a receiver that assembles the bits back into a  
character. Data rate, error checking, handshaking, and character framing  
(start/stop bits) are pre-defined and must correspond at both the transmitting  
and receiving ends.  
Asynchronous communications is the standard means of serial data  
communication for PC compatibles and PS/2 computers. The original PC was  
equipped with a communication or COM: port that was designed around an 8250  
Universal Asynchronous Receiver Transmitter (UART). This device allows  
asynchronous serial data to be transferred through a simple and straightforward  
programming interface. A starting bit followed by a pre-defined number of data  
bits (5, 6, 7, or 8) defines character boundaries for asynchronous  
communications. The end of the character is defined by the transmission of a  
pre-defined number of stop bits (usually 1, 1.5 or 2). An extra bit used for error  
detection is often appended before the stop bits.  
Idle state of  
line  
Odd, Even  
or  
Unused  
Remain Idle or  
next start bit  
5 to 8 Data Bits  
1
P
BIT  
STOP  
1
0
1.5  
2
Figure 3 - Asynchronous Communications Bit Diagram  
This special bit is called the parity bit. Parity is a simple method of determining if  
a data bit has been lost or corrupted during transmission. There are several  
methods for implementing a parity check to guard against data corruption.  
Common methods are called (E)ven Parity or (O)dd Parity. Sometimes parity is  
not used to detect errors on the data stream. This is refereed to as (N)o parity.  
Because each bit in asynchronous communications is sent consecutively, it is  
easy to generalize asynchronous communications by stating that each character  
is wrapped (framed) by pre-defined bits to mark the beginning and end of the  
serial transmission of the character. The data rate and communication parameters  
for asynchronous communications have to be the same at both the transmitting  
and receiving ends. The communication parameters are baud rate, parity, number  
of data bits per character, and stop bits (i.e. 9600,N,8,1).  
OMG-COMM8 -PCI  
Page 12  
Appendix E - Silk-Screen  
Appendix E - Silk-Screen  
3.8"  
5.650"  
3.475"  
OMG-COMM8 -PCI  
Page 13  
Appendix F - Compliance Notices  
Appendix F - Compliance Notices  
Federal Communications Commission Statement  
FCC - This equipment has been tested and found to comply with the limits for  
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are  
designed to provide reasonable protection against harmful interference when the  
equipment is operated in a commercial environment. This equipment generates,  
uses, and can radiate radio frequency energy and, if not installed and used in  
accordance with the instruction manual, may cause harmful interference to radio  
communications. Operation of this equipment in a residential area is likely to  
cause harmful interference in such case the user will be required to correct the  
interference at his own expense.  
EMC Directive Statement  
Products bearing the CE Label fulfill the requirements of the  
EMC directive (89/336/EEC) and of the low-voltage directive  
(73/23/EEC) issued by the European Commission.  
To obey these directives, the following European standards must be met:  
EN55022 Class A - “Limits and methods of measurement of radio  
interference characteristics of information technology equipment”  
EN55024-‘Information  
technology  
equipment  
Immunity  
characteristics Limits and methods of measurement.  
EN60950 (IEC950)  
-
“Safety of information technology  
equipment, including electrical business equipment”  
Warning  
This is a Class A Product. In a domestic environment this product may cause  
radio interference in which case the user may be required to take adequate  
measures.  
Always use cabling provided with this product if possible. If no cable is  
provided or if an alternate cable is required, use high quality shielded cabling to  
maintain compliance with FCC/EMC directives.  
OMG-COMM8 -PCI  
Page 14  
WARRANTY/DIS CLAIMER  
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in m aterials and workm anship for a  
period of 13 m o n t h s from date of purchase. OMEGA’s WARRANTY adds an additional one (1) m onth  
grace period to the norm al o n e (1 ) ye a r p ro d u c t w a rra n t y to cover handling and shipping tim e. This  
ensures that OMEGA’s custom ers receive m axim um coverage on each product.  
If the unit m alfunctions, it m ust be returned to the factory for evaluation. OMEGA’s Custom er Service  
Departm ent will issue an Authorized Return (AR) num ber im m ediately upon phone or written request.  
Upon exam ination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no  
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, includ-  
in g b u t n o t lim ite d to m is h a n d lin g , im p ro p e r in te rfa cin g , o p e ra tio n o u ts id e o f d e s ig n lim its ,  
im proper repair, or unauthorized m odification. This WARRANTY is VOID if the unit shows evidence of  
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;  
or current, heat, m oisture or vibration; im proper specification; m isapplication; m isuse or other operating  
conditions outside of OMEGA’s control. Com ponents which wear are not warranted, including but not  
lim ited to contact points, fuses, and triacs.  
O M EG A is p le a s e d t o o ff e r s u g g e s t io n s o n t h e u s e o f it s va r io u s p ro d u c t s . Ho w e ve r,  
OMEGA neither assum es responsibility for any om issions or errors nor assum es liability for any  
dam ages that result from the use of its products in accordance w ith inform ation provided by  
OMEGA, either verbal or w ritten. OMEGA w arrants only that the parts m anufactured by it w ill be  
a s s p e c if ie d a n d f r e e o f d e f e c t s . O M EG A M A KES N O OTHER WA RRA N TIES O R  
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,  
AND ALL IMP LIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND  
FITN ES S FO R A PA RTIC U LA R P U RP O S E A RE HEREBY D IS C LA IM ED. LIM ITATIO N O F  
LIABILITY: The rem edies of purchaser set forth herein are exclusive, and the total liability of  
OMEGA w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t , w a rra n t y, n e g lig e n c e ,  
in d e m n ific a t io n , s t ric t lia b ilit y o r o t h e rw is e , s h a ll n o t e xc e e d t h e p u rch a s e p ric e o f t h e  
c o m p o n e n t u p o n w h ic h lia b ilit y is b a s e d . In n o e v e n t s h a ll O M EG A b e lia b le f o r  
consequential, incidental or special dam ages.  
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic  
Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in m edical  
applications or used on hum ans. Should any Product(s) be used in or with any nuclear installation or  
activity, m edical application, used on hum ans, or m isused in any way, OMEGA assum es no responsibility  
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indem nify  
OMEGA and hold OMEGA harm less from any liability or dam age whatsoever arising out of the use of the  
Product(s) in such a m anner.  
RETURN REQUESTS /INQUIRIES  
Direct all warranty and repair requests/inquiries to the OMEGA Custom er Service Departm ent. BEFORE  
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN  
(AR) NUMBER FROM OMEGA’S CUS TOMER S ERVICE DEPARTMENT (IN ORDER TO AVOID  
PROCESSING DELAYS). The assigned AR num ber should then be m arked on the outside of the return  
package and on any correspondence.  
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent  
breakage in transit.  
FOR WARRANTY RETURNS, please have the  
following inform ation available BEFORE  
contacting OMEGA:  
FOR NON-WARRANTY REPAIRS, consult OMEGA  
for current repair charges. Have the following  
inform ation available BEFORE contacting OMEGA:  
1. Purchase Order number under which the product  
was PURCHASED,  
1. Purchase Order num ber to cover the COST  
of the repair,  
2. Model and serial num ber of the product under  
warranty, and  
3. Repair instructions and/or specific problem s  
relative to the product.  
2. Model and serial num ber of the product, and  
3. Repair instructions and/or specific problem s  
relative to the product.  
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible. This affords  
our custom ers the latest in technology and engineering.  
OMEGA is a registered tradem ark of OMEGA ENGINEERING, INC.  
© Copyright 2002 OMEGA ENGINEERING, INC. All rights reserved. This docum ent m ay not be copied, photocopied,  
reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or in part, without the  
prior written consent of OMEGA ENGINEERING, INC.  
Where Do I Find Everything I Need for  
Process Measurement and Control?  
OMEGA…Of Course!  
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Data Acquisition & Engineering Software  
Communications-Based Acquisition Systems  
Plug-in Cards for Apple, IBM & Compatibles  
Datalogging Systems  
Recorders, Printers & Plotters  
HEATERS  
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Heating Cable  
Cartridge & Strip Heaters  
Immersion & Band Heaters  
Flexible Heaters  
Laboratory Heaters  
ENVIRONMENTAL  
MONITORING AND CONTROL  
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Metering & Control Instrumentation  
Refractometers  
Pumps & Tubing  
Air, Soil & Water Monitors  
Industrial Water & Wastewater Treatment  
pH, Conductivity & Dissolved Oxygen Instruments  
M3902/0303  

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