Chapter 2 Installation
10
EC71813CLD2NA SERIES
Serial Port
The board provides two standard DB9 serial ports: COM1 supports Modem wakeup
function and RS232 mode; COM2 supports RS232/RS485 mode selection; it also
provides eight 2x5Pin serial ports (Pitch: 2.54mm) of RS232 mode. The pin
definitions are as follows:
J1(COM1)
Pin
Signal Name
1
DCD#
2
RXD
3
TXD
4
DTR#
5
GND
6
DSR#
7
RTS#
8
CTS#
9
RI#
J1(COM2)
Pin
Signal Name
RS232
RS485
1
DCD#
Data
2
RXD
Data+
3
TXD
NC
4
DTR#
NC
5
GND
GND
6
DSR#
NC
7
RTS#
NC
8
CTS#
NC
9
RI#
NC
Note: the data transmission direction of COM2 is controlled automatically under
RS485 mode.