ProSoft Technology 3170-MBS - Manual (Page 16)

Module Configuration and Installation 3170-MBS ♦ Flex Platform
User Manual Modbus Slave Interface Module
Page 16 of 55 ProSoft Technology, Inc.
October 27, 2010
3.3 Wiring
Attention: When connecting wiring, torque terminal screws to 7 to 9 inch-pounds.
Connect To
TxRxD- 1
TxRxD+ 2
1 Connect the Modbus cable to the removable connector.
2 Connect +24V dc input to the left side of the lower connector, terminal E.
3 Connect 24V common to the left side of the upper connector, terminal D.
4 Connections G and F are used to pass 24V dc power (G) and 24V common
(F) to the next module in the series (if required).
3.3.1 RS-485 Tip
If communication in the RS-485 mode does not work at first, despite all attempts,
try switching termination polarities. Some manufacturers interpret + and -, or A
and B, polarities differently.