Vecow SPC-4500 User Manual page 26

2.3.1.3 Serial Port (COM1/COM2)
Serial ports can be configured into 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/COM2 pin assignments are listed in the following table :
Serial
Port
1 to 2
©Vecow SPC-4500 User Manual
DC-IN 12V
V+ V
BIOS Setting
COM1 (Upper)
COM2 (Lower)
Pin
RS-232
No.
1 GND_EARTH
2 GND
3 RI
4 DTR
5 CTS
6 TXD
7 RTS
8 RXD
9 DSR
10 DCD
COM 1
COM 2
RS-422 (5-wire)
RS-422 (9-wire)
RS-485 w/z auto-flow control
RS-422 RS-422
(5-wire) (9-wire)
GND_EARTH GND_EARTH
GND
-----------
RXD-
-----------
RXD+
-----------
TXD+
-----------
TXD-
GETTING TO KNOW YOUR SPC-4500
LAN 1
LAN 2
Function
RS-232
RS-485
RS-485
(3-wire)
GND_EARTH
GND GND
CTS- RI
RXD- -----------
CTS+ -----------
RXD+ -----------
RTS+ -----------
TXD+ DATA+
RTS- -----------
TXD- DATA-
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