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25 PPC-L128T User Manual
Appendix A I/O Pin Assignments
A.4 COM2 (CN28)
A.5 COM3 RS-232 serial port (CN38)
Table A.4: COM2 (CN28)
Pin Signal RS-232 RS-422 RS-485
1 DCD TX- DATA-
2RX TX+ DATA+
3TX RX+
4DTR RX-
5GND GND
6DSR
7RTS
8CTS
9RI
Table A.5: COM3 RS-232 serial port (CN38)
Pin Signal Pin Signal
1DCD# 2RX
3 TX 4 DTR#
5GND 6DSR#
7RTS# 8CTS#
9RI#