Vecow EVS-2000 Series User Manual page 30

2.3.3 COM Ports
Serial port 1~4 (COM 1~4) can be configured for RS-232, RS-422, or RS-485
with auto flow control communication. The default definition of COM 1 to COM4
is RS-232; but 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 rear i/Io D-SUB connector pin assignments are listed in the following table :
Serial Port Pin No.
1
2
3
4
1 to 4 5
6
7
8
9
COM1 TO COM4 MB connector table :
COM Port
COM 1
COM 3
RS-232
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
RI
MB Connector
COM 1
COM 3
Function
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
RS-422 RS-422
(5-wire) (9-wire)
TXD- TXD-
TXD+ TXD+
RXD+ RXD+
RXD- RXD-
GND GND
RTS-
-----------
RTS+
-----------
CTS+
-----------
CTS-
-----------
COM Port
COM 2
COM 4
GETTING TO KNOW YOUR EVS-2000
RS-485
(3-wire)
DATA-
DATA+
-----------
-----------
GND
-----------
-----------
-----------
-----------
MB Connector
COM 2
COM 4
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