Appendix B: Rs-232 & Rs-422/485 Pinouts - B&B Electronics 3PCIOSD1A Manual

Appendix B: RS-232 & RS-422/485 Pinouts
Table 1: RS-232 Pinouts
Name Description
Shield Shield
TD Transmit Data
RD Receive Data
RTS Request to Send
CTS Clear to Send
DSR Data Set Ready
GND Signal Ground
DCD Data Carrier Detect
DTR Data Terminal Ready
Table 2: RS-422/485 Pinouts
Name Description
Shield Shield
TD (A) −
Transmit Data A
RD (A) −
Receive Data A
GND Signal Ground
TD (B) + Transmit Data B
RD (B) + Receive Data B
With 2-wire RS-485 mode operation, your connection cable must
jumper TD(A) to RD(A) and TD(B) to RD(B). Connect from TD(A)
and TD(B) to the Data A(−) and Data B(+) wires of your RS-485
network.
Note that the EIA RS-422 Specification labels data lines with an "A"
and "B" designator. Some RS-422 equipment uses a "−" and "+"
designator. In almost all cases, the "A" line is the equivalent of the
"−" line and the "B" line is the equivalent of the "+" line. More
information on RS-422 communications can be found in our free RS-
422/485 Application Note (available on our websites).
Documentation Number 3PCIOSD1x-3903m Manual
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
Direction DB25M
Pin
------ 1
Output 2
Input 3
Output 4
Input 5
Input 6
------ 7
Input 8
Output 20
Direction DB25M
Pin
------ 1
Output 2
Input 3
------ 7
Output 14
Input 16
Appendix B B-1 B-2 Appendix B Documentation Number 3PCIOSD1x-3903m Manual
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