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C-2 Appendix C 485DS32985 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 434-7094
Chart 4. RS-232 DCE Device w/DB9 Connector to
485DSS RS-232 (DTE) Port
RS-232 DCE
Serial Port
DB9 Connector
Signal
Direction
485DSS
RS-232 (DTE) Port
DB25 Connector
2 -----------> 3
3 <----------- 2
5 <---------> 7
7 <----------- 4
8 -----------> 5
Chart 5. RS-422/485 4-Wire Device to 485DSS RS-422/485 Port.
RS-422/485
4-Wire
Device
Signal
Direction
485DSS
RS-485/422
Terminal Blocks
TD (A)(-) -----------> RD (A)
TD (B)(+) -----------> RD (B)
Signal Ground <----------> GND
RD (A)(-) <----------- TD (A)
RD (B)(+) <----------- TD (B)
Chart 6. RS-485 2-Wire Device to 485DSS RS-485/422 Port.
RS-485
2-Wire
Device
Signal
Direction
485DSS
RS-485/422
Terminal Blocks
Data (A)(-) <----------> TD (A) & RD(A)
Data (B)(+) <----------> TD (B) & RD(B)
Signal Ground <----------> GND