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I815E User’s Manual 21
J15, J12: COM1 / COM2 Serial Ports
J15 (COM1) is a DB-9 connector, while J12 (COM2) is a 10-pin header.
Refer to the table below for their pin assignments.
COM1 COM2
Signal Name Pin # Pin # Signal Name
DCD, Data carrier detect 1 6 DSR, Data set ready
RXD, Receive data 2 7 RTS, Request to send
TXD, Transmit data 3 8 CTS, Clear to send
DTR, Data terminal ready 4 9 RI, Ring indicator
Ground 5 10 Not Used
J12 (COM2) is jumper selectable for RS-232, RS-422 and RS-485.
Pin #
Signal Name
RS-232 R2-422 RS-485
1 DCD TX- DATA-
2 RX TX+ DATA+
3 TX RX+ NC
4 DTR RX- NC
5 Ground Ground Ground
6 DSR RTS- NC
7 RTS RTS+ NC
8 CTS CTS+ NC
9 RI CTS- NC
10 NC NC NC