Chapter 2 Installation and Verification
PCI Serial for Windows Me/9x 2-10 ni.com
DB-25 Connector
Figure 2-7 and Table 2-3 give the pin locations and descriptions of the
DB-25 connector, which is on the optional 10-position modular jack
toDB-25 cable.
Figure 2-7. DB-25 Connector Pin Locations
Table 2-3. DB-25 Pin 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–
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