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S C M 9 B - D 1 9 2
USERS MANUAL
R E V I S E D : 0 7 - 2 6 - 1 8
Dataforth Corporation
3331 E. Hemisphere Loop
Tucson, AZ 85706
The information in this publication has been carefully checked and is
believed to be accurate; however, no responsibility is assumed for
possible inaccuracies or omissions. Applications information in this
manual is intended as suggestions for possible use of the products and
not as explicit performance in a specific application. Specifications may be
subject to change without notice.
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Summary of Contents for Dataforth SCM9B-D192 Series
- Page 1 S C M 9 B - D 1 9 2 USERS MANUAL R E V I S E D : 0 7 - 2 6 - 1 8 Dataforth Corporation 3331 E. Hemisphere Loop Tucson, AZ 85706 The information in this publication has been carefully checked and is believed to be accurate;...
- Page 2 2 SCM9B-D192 USERS MANUAL WARRANTY DATAFORTH warrants each SCM9B-D192 series module to be free from defects in materials and workmanship under normal conditions of use and service and will replace any component found to be defective, on its return to DATAFORTH, transportation charges prepaid within one year of its original purchase.
- Page 3 3 SCM9B-D192 USERS MANUAL GENERAL DESCRIPTION The RS-485 communications standard is recommended when many modules, or other addressable devices, must be connected to a host computer over long distances. The SCM9B-D192 repeaters allow communications bus lengths up to 4,000 feet and baud rates up to 115K baud using one twisted pair of wires.
- Page 4 4 SCM9B-D192 USERS MANUAL SPECIFICATIONS Max common mode voltage: 500Vrms, 60s duration. Baud rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 (Dip -switch selectable). Temperature range (operating & storage): -25 to +70°C. Relative humidity: 0 - 95% noncondensing. Warranty: 3 years on workmanship and materials.
- Page 5 5 SCM9B-D192 USERS MANUAL An RS-485 repeater is necessary to extend the length of an RS-485 network, or connect more than 32 RS-485 devices on an RS-485 network. The SCM9B-D192 repeater contains a seven-pin screw terminal plug. The pin designations are located on the label of each module. The screw terminals will accept up to #14 gauge wire (AWG).
- Page 6 6 SCM9B-D192 USERS MANUAL ground. The biasing resistors and are normally positioned at the HOST end of the cable. The RS-485 standard also requires two resistors across the data lines for proper termination. Two 220Ω resistors should be connected between the DATA and DATA* lines. The resistors should be placed at each end of the RS-485 cable.
- Page 7 7 SCM9B-D192 USERS MANUAL FACTORY RS-485 TERMINATION SETTINGS Each SCM9B-D192 contains internal pin strips for enabling the internal termination and biasing resistors. Each pc board is clearly marked with the jumper designators adjacent to each row of pins. The jumper designators are +1K, 220 and -1K.
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