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SCM9B-A1000 and SCM9B-A2000 SERIES
CONVERTER BOXES
USERS MANUAL
R E V I S E D : 0 7 - 2 6 - 1 8
DATAFORTH CORPORATION
3 3 3 1 E A S T H E M I S P H E R E L O O P
TUCSON, AZ 85706
T E L E P H O N E : 5 2 0 - 7 4 1 - 1 4 0 4
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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Table of Contents
Related Manuals for Dataforth SCM9B-A1000 Series
Summary of Contents for Dataforth SCM9B-A1000 Series
- Page 1 R E V I S E D : 0 7 - 2 6 - 1 8 DATAFORTH CORPORATION 3 3 3 1 E A S T H E M I S P H E R E L O O P...
- Page 2 RS-485. The RS-485 communications standard is recommended when many DATAFORTH modules, or other addressable devices, must be connected to a host computer over long distances. The SCM9B-A1000 and SCM9B-A2000 converters allow communications bus lengths up to 4,000 feet and baud rates up to 115K baud using one twisted pair of wires.
- Page 3 The RS-485 descriptions are all preceded by letters which correspond to the color coded wires used in standard telephone cable: (B) Black, (R) Red, (G) Green and (Y) Yellow. All DATAFORTH hardware using RS-485 contains this color coded nomenclature. Figures 1A & 1B show the rear panel connections for the SCM9B-A1000 &...
- Page 4 SCM9B-A1000 & SCM9B-A2000 USERS MANUAL 4 S C M 9 B - A 1 0 0 0 / 2 0 0 0 R S - 2 3 2 D B - 9 C O N N E C T O R The SCM9B-A1000 and SCM9B-A2000 contain a female DB-9 connector normally used with modems or other Data Communications Equipment (DCE).
- Page 5 5 SCM9B-A1000 & SCM9B-A2000 USERS MANUAL be reamplified and retransmitted on to the RS-485 OUT connector data lines. This connector is left open when the SCM9B-A1000 or SCM9B-A2000 is used as an RS-232-to-RS-485 converter. S C M 9 B - A 1 0 0 0 / 2 0 0 0 R S - 4 8 5 O U T C O N N E C T O R The SCM9B-A1000 and SCM9B-A2000 converters contain a four-pin screw terminal plug labelled RS-485 OUT.
- Page 6 SCM9B-A1000 & SCM9B-A2000 USERS MANUAL 6 BAUD RATE The SCM9B-A1000 and SCM9B-A2000 series converters each contain a 10-position DIP switch located on the rear panel. The DIP switch is used to select the correct communications baud rate and must be set to the same value as the devices connected to the RS-485 OUT connector.
- Page 7 7 SCM9B-A1000 & SCM9B-A2000 USERS MANUAL should be placed at each end of the RS-485 cable. Please refer to Figure 2 for a typical RS-485 system application. The SCM9B-A1000 and SCM9B-A2000 each contain the biasing and termination resistors necessary to interface any equipment on an RS-485 network.
- Page 8 SCM9B-A1000 & SCM9B-A2000 USERS MANUAL 8 switch is labelled +1K, -1K and 220. Set the appropriate switch to the "up" position to enable a resistor. NOTE: The RS-485 IN +1K and -1K switches should be "up" when the SCM9B-A1000 is used as a RS-232/RS-485 converter. SCM9B-A2000 RS-485 TERMINATIONS Proper biasing and termination resistors in the SCM9B-A2000 may be enabled by using the internal jumpers contained in the SCM9B-A2000.
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