B&B Electronics 232D4SS8 manual Ports a H

Chart 9. RS-422/485 4-Wire Device to Port (A - H) Configured

as an RS-422 /485 Port.

RS-422/485			232D4SS8
4-Wire		Signal	Ports A - H
Device	Direction		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			232D4SS8
2-Wire		Signal	Ports A - H
Device	Direction		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.

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