Chart 9. Rs-422/485 4-Wire Device To Port (A - H); Configured As An Rs-422/485 Port; Chart 10. Rs-485 2-Wire Device To Port (A - H); Configured As An Rs-485 Port - B&B Electronics 8 PORT SMART SWITCH CE 232D4SS8 User Manual

Chart 9. RS-422/485 4-Wire Device to Port (A - H) Configured
RS-422/485
4-Wire
Device
TD (A)*
TD (B)*
Signal Ground
RD (A)*
RD (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
RS-485
2-Wire
Device
Data (A)*
Data (B)*
Signal Ground
•
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
as an RS-422 /485 Port.
Signal
Direction
----------->
----------->
<---------->
<-----------
<-----------
an RS-485 Port.
Signal
Direction
<---------->
<---------->
<---------->
Appendix B
232D4SS8
Ports A - H
DB25 Connector
17 - RD (A)
16 - RD (B)
7 - SG
15 - TD (A)
14 - TD (B)
232D4SS8
Ports A - H
DB25 Connector
15 - TD (A)
14 -TD (B)
7 - SG
B-5