AppendixA ConnectorDescriptions
SerialHardware and Software for Windows A-4 ni.com
DB-25 Connector
FigureA -3 and TableA-3 give the pin locations and descriptions of the
DB-25 connector,which is on the optional 10-position mo dular jack
to DB-25 cable.
FigureA-3. DB-25Connector Pin Locations
TableA-3. DB-25Pin Descriptions
DB-25 Pin 232 Signal 485 Signal
2TXD RTS+(HSO+)
3RXD CTS+ (HSI+)
4RTS RTS–(HSO–)
5CTS TXD+
6DSR* CTS–(HSI–)
7GND RXD–
8DCD* GND
20 DTR* RXD+
22 RI* TXD–
Pinsnot listed in this table are No Connect.
*These signals are not supported by the isolated 232 ports.
PIN1
PIN25
PIN13
PIN14