Filter
Top Products
Page 24
724-746-5500 | blackbox.com
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.