232XSSD43800 Manual
B-5
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5104
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
232XSSD4
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
232XSSD4
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.
