Intel I815E User Manual
Page 25
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INSTALLATIONS
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
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