20 PCA-6145B/6145L User's Manual
with the card) holds the connector for the other port. This lets
you connect and disconnect cables after you install the card. The
DB-9 connector on the bottom of the bracket is the first RS-232
port, COM1. The DB-9 connector on the adapter kit is the second
serial port, COM2.
Serial port connections (COM1, COM2)
Connector Address
COM1 RS-232
COM2 RS-232/422/485
RS-232 connection (COM1)
Different devices implement the RS-232 standard in different
ways. If you are having problems with a serial device, be sure to
check the pin assignments for the connector. The following table
shows the pin assignments for the card's RS-232 port:
RS-232 connector pin assignments
Pin Signal
1 DCD
2RX
3TX
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9RI
1
5
6
9
COM1
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