Chapter 2 Installation and Verification
PCI Serial for Windows Me/9x 2-8 ni.com
DB-9 Connector
Figure 2-5 and Table 2-1 give the pin locations and descriptions of the
DB-9 connector, which is on the two-port PCI serial board, the 10-position
modular jack to DB-9 cable, the cable adapter for the eight-port board, and
the DB-9 connectors to the sixteen-port breakout box.
Figure 2-5. DB-9 Connector Pin Locations
Table 2-1. DB-9 Pin Descriptions
DB-9 Pin 232 Signal 485 Signal
1DCD* GND
2RXD CTS+ (HSI+)
3TXD RTS+ (HSO+)
4DTR* RXD+
5GND RXD–
6DSR* CTS– (HSI–)
7RTS RTS– (HSO–)
8CTS TXD+
9RI* TXD–
* These signals are not supported by the isolated 232 boards or ports 9-16 of the RS-232
sixteen-port board.
PIN 1
PIN 9
PIN 5
PIN 6