19
GETTING TO KNOW YOUR MTC-4015
2.3.4 Serial Port COM
Serial
Port
Pin No.
RS-232
RS-422
(5-wire)
RS-422
(9-wire)
RS-485
(3-wire)
1, 2
3, 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 follow :
BIOS Setting
Function
COM 1 (CN7) /
COM 2 (CN8) /
COM 3 (CN11) /
COM 4 (CN12)
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
Serial port can be configured for RS-232, RS-422, or RS-485 with auto flow
control communication. The default definition is RS-232, if you want to change
to RS-422 or RS-485, you can find the setting in BIOS.
COM1
COM3
COM2
COM4
V+ V
IGN
On | Off
DC-IN 6~36V
LAN3
LAN4
LAN5
LAN6
PoE+
Isolated
DIO
20
11
3
4
5
6
10
1
D I
PIN 1 ~ 8
DO
PIN 11 ~ 18
USB 2.0
