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2.3.4 Serial Port
PoE+
PoE+
3
4
LAN 3
LAN 5
LAN 4
LAN 6
Serial port 1 to 4 (COM 1 to 4) can be configured for RS-232, RS-422, or RS-
485 with auto flow control communication. The default definition of COM 1 and
COM 2 is RS-232, if you want to change to RS-422 or RS-485, you can find the
setting in BIOS.
BIOS Setting
COM 1
COM 2
COM 3
COM 4
The pin assignments are listed in the table as follow :
Serial
Pin No.
Port
1
2
3
4
1 to 4
5
6
7
8
9
COM 1
COM 3
5
6
COM 2
COM 4
Function
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
RS-232
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
DIO
Isolated
20
11
10
1
PIN 1 ~ 8
D I
PIN 11 ~ 18
DO
RS-422
RS-422
(5-wire)
(9-wire)
TXD-
TXD-
TXD+
TXD+
RXD+
RXD+
RXD-
RXD-
GND
GND
-----------
RTS-
-----------
RTS+
-----------
CTS+
-----------
CTS-
GETTING TO KNOW YOUR Echo-236F
DC-IN
IGN
On / Off
Power Switch
RS-485
(3-wire)
DATA-
DATA+
-----------
-----------
GND
-----------
-----------
-----------
-----------
39
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