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Appendix B: Electrical Interfaces
RS-422 and RS-485 four-wire (DB9 male)
Figure B-2. DB9 male connector.
Table B-2. RS-422 and
RS-485 (DB9 male
connector pinout).
Pin Number
Signal
1
RX+
2
RX-
3
TX+
4
TX-
5
GND
6
9
NOTE: Pins 6–9 are not connected.
RS-485 two-wire (DB9 male)
Figure B-3. DB9 male connector.
Table B-2. RS-422 and
RS-485 (DB9 male
connector pinout).
Pin Number
Signal
3
DATA-
4
DATA+
5
GND
6
9
NOTE: Pins 1, 2, and 6-9 are not connected.
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