17
GETTING TO KNOW YOUR ECS-9755
2.3.3 COM Ports
Serial
Port
Pin No.
RS-232
RS-422
(5-wire)
RS-422
(9-wire)
RS-485
(3-wire)
1 to 4
1
DCD
TXD-
TXD-
DATA-
2
RXD
TXD+
TXD+
DATA+
3
TXD
RXD+
RXD+
-----------
4
DTR
RXD-
RXD-
-----------
5
GND
GND
GND
GND
6
DSR
-----------
RTS-
-----------
7
RTS
-----------
RTS+
-----------
8
CTS
-----------
CTS+
-----------
9
RI
-----------
CTS-
-----------
The pin assignments are listed in the table as below:
BIOS Setting
Function
COM 1
COM 2
COM 3
COM 4
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
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.
COM 2
COM 1
COM 3
COM 4
V+ V-
On | Off
DC-IN
IGN
LAN6
PoE
LAN5
PoE
LAN4
PoE
LAN3
PoE
Isolated
DIO 2
D I
PIN 1 ~ 8
DO
PIN 11 ~ 18
20
11
10
1
Isolated
DIO 1
D I
PIN 1 ~ 8
DO
PIN 11 ~ 18
20
11
10
1
10G
10G
