Assembly and Maintenance
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PPC-1561
5.3.6 Standard DB9 COM Ports
The carrier board provides six DB9 ports. The ports are double-layer combo socket.
J9 (COM1, COM2) and J10 (COM3, COM4) support RS-232/RS-422/RS-485 modes.
Their pin definitions are as follows:
Signal Name
Pin
RS-232
(Default)
RS-422
RS-485
1 DCD#
TXN
DATA-
2 RXD
TXP
DATA+
3 TXD
RXP NC
4 DTR#
RXN NC
5 GND
GND GND
6 DSR#
NC NC
7 RTS#
NC NC
8 CTS#
NC NC
J9, J10 (COM1
～
COM4)
9 RI#
NC NC
J11 (COM5, COM6) supports RS-232 mode. Its pin definitions are as follows:
Pin
Signal Name
1 DCD#
2 RXD
3 TXD
4 DTR#
5 GND
6 DSR#
7 RTS#
8 CTS#
J11 (COM5, COM6)
9 RI#
The COM combo socket used by the carrier board is a Natconn product: DB9M
pin-header D type, double-layer, with hex bolt.
