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232D4SS84502 Manual Appendix B B-5
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Chart 9. RS-422/485 4-Wire Device to Port (A - H) Configured
as an RS-422 /485 Port.
RS-422/485
4-Wire
Device
Signal
Direction
232D4SS8
Ports A - H
DB25 Connector
TD (A)* -----------> 17 - RD (A)
TD (B)* -----------> 16 - RD (B)
Signal Ground <----------> 7 - SG
RD (A)* <----------- 15 - 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-485 2-Wire Device to Port (A - H) Configured as
an RS-485 Port.
RS-485
2-Wire
Device
Signal
Direction
232D4SS8
Ports A - H
DB25 Connector
Data (A)* <----------> 15 - 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".
• Place a jumper between the TD (A) and the RD (A) to make the
Data (A) line. Also place a jumper between TD (B) and RD (B)
to make the Data (B) line.
NOTE: Make sure the port's set-up jumpers are in the proper
position for two-wire communications.