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SCM9B-A1000 and SCM9B-A2000 SERIES
CONVERTER BOXES
USERS MANUAL

R E V I S E D :  

07-26-18

DATAFORTH CORPORATION
3 3 3 1   E A S T   H E M I S P H E R E   L O O P
T U C S O N ,   A Z     8 5 7 0 6

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.

Summary of Contents for SCM9B-A1000 Series

Page 1: ...formation 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 ...

Page 2: ...out external handshaking signals from the host Therefore host software written for RS 232 may be used without modification RS 485 bus control is completely transparent to the user The SCM9B A1000 and SCM9B A2000 can also operate as RS 485 repeaters Repeaters are required to extend communications bus lengths or allow more than 32 RS 485 devices to be connected to a communications bus A repeater sim...

Page 3: ...s 8 08 W x 2 50 H x 6 25 D SCM9B A1000 7 06 W x 1 53 H x 5 30 D SCM9B A2000 RS 485 Connectors Phoenix screw terminal barrier plug supplied Replace with Phoenix MSTB 2 5 4 ST 5 08 or equivalent Warranty 3 years on workmanship and materials CONNECTIONS The SCM9B A1000 and SCM9B A2000 have three connectors located on the rear panel two RS 485 connectors and one RS 232 connector The RS 485 connectors ...

Page 4: ...NO CONNECTION 5 GND SIGNAL GROUND 6 DSR DATA SET READY 7 NC NO CONNECTION 8 CTS CLEAR TO SEND 9 NC NO CONNECTION The RS 232 connector is left open when the SCM9B A1000 or SCM9B A2000 is used as an RS 485 Repeater The only connections normally required for proper SCM9B A1000 operation are pins 2 3 and 5 of the DB 9 connector DB 9 to DB 25 adapters can be made using the connections below DB 9 Pin DB...

Page 5: ...000 is used as an RS 232 to RS 485 converter SCM9B A1000 2000 RS 485 OUT CONNECTOR The SCM9B A1000 and SCM9B A2000 converters contain a four pin screw terminal plug labelled RS 485 OUT This connector is the RS 485 output for the SCM9B A1000 and SCM9B A2000 when used as either a converter or repeater Figure 1A Connections for SCM9B A1000 Figure 1B Connections for SCM9B A2000 ...

Page 6: ...er and locate the 3 pin strip on the PC board directly behind the LEDs Lift the jumper bar from the pin strip and place it over the two pins located closest to LEDS OFF written on the PC board The POWER SCM9B A1000 and PWR SCM9B A2000 LEDs are pilot lights that indicate adequate power supply voltage is applied to the converter The TRANSMIT SCM9B A1000 and TX SCM9B A2000 LEDs illuminate as data is ...

Page 7: ... RS 485 TERMINATIONS Each SCM9B A1000 contains internal RS 485 termination and biasing resistors for proper termination of a RS 485 system The resistors are enabled or disabled via two 3 position DIP switches located on the SCM9B A1000 rear panel One three position switch enables termination resistors for the RS 485 IN HOST data lines and the other switch enables termination of the RS 485 OUT data...

Page 8: ... the jumpers on the SCM9B A2000 printed circuit board The jumpers are shown in the factory setting to enable a resistor insert a jumper into the jack position adjacent to the resistor nomenclature written on the SCM9B A2000 printed circuit board NOTE The RS 485 IN 1K and 1K jumpers should be installed when the SCM9B A2000 is used as a RS 232 RS 485 converter FACTORY RS 485 TERMINATION SETTINGS SCM...

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