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Appendix A Connector Descriptions
Serial Hardware and Software for Windows A-4 ni.com
DB-25 Connector
Figure A-3 and Table A-3 give the pin locations and descriptions of the
DB-25 connector, which is on the optional 10-position modular jack
to DB-25 cable.
Figure A-3. DB-25 Connector Pin Locations
Table A-3. DB-25 Pin Descriptions
DB-25 Pin 232 Signal 485 Signal
2 TXD RTS+ (HSO+)
3 RXD CTS+ (HSI+)
4 RTS RTS– (HSO–)
5 CTS TXD+
6 DSR* CTS– (HSI–)
7 GND RXD–
8 DCD* GND
20 DTR* RXD+
22 RI* TXD–
Pins not listed in this table are No Connect.
* These signals are not supported by the isolated 232 ports.
PIN 1
PIN 25
PIN 13
PIN 14