B&B Electronics Port Expander 232PE - Manual (Page 20)

A-6 Appendix A 232PE3095 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Chart 9. RS-422/485 4-Wire Device to Port (A - D) Configured
as an RS-422 /485 Port.
Master port of 232XSS configured as an RS-232 DCE port.
RS-422/485
4-Wire
Device
Signal
Direction
232PE
Ports A - D
DB25 Connector
TD (A)* -----------> 3 - RD (A)
TD (B)* -----------> 16 - RD (B)
Signal Ground <----------> 7 - SG
RD (A)* <----------- 2 - TD (A)
RD (B)* <----------- 14 - TD (B)
* If the device being connected uses "+" and "-" in place of "B"
and "A", the "+" replaces the "B" and the "-" replaces the "A".
NOTE: Make sure the port's set up jumpers are in the proper
position for four-wire communications.
Chart 10. RS-422/485 2-Wire Device to Port (A - D) Configured
as an RS-422/485 Port.
Master port of 232XSS configured as an RS-232 DCE port.
RS-422/485
2-Wire
Device
Signal
Direction
232PE
Ports A - D
DB25 Connector
Data (A)* <----------> 2 - TD (A)
Data (B)* <----------> 14 -TD (B)
Signal Ground <----------> 7 - SG
* If the device being connected uses "+" and "-" in place of "B"
and "A", the "+" replaces the "B" and the "-" replaces the "A".
NOTE: Make sure the port's set up jumpers are in the proper
position for two-wire communications.