Vecow SPC-4500, User Manual

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28 ©Vecow SPC-4500 User Manual GETTING TO KNOW YOUR SPC-4500
2.4.9 CN6/CN7
Serial port 3 (CN6) & port4 (CN7) can be configured into RS-232, RS-422, or
RS-485 with auto flow control communication. The default definition of COM 1 to
COM 4 is RS-232. If you want to change to RS-422 or RS-485, please find the
setting in BIOS.
BIOS Setting Function
COM 3 (CN6)
COM 4 (CN7)
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
COM3/COM4 pin assignments are listed in the following table :
Serial
Port
Pin
No.
RS-232
RS-422
(5-wire)
RS-422
(9-wire)
RS-485
(3-wire)
3, 4
1 GND_EARTH GND_EARTH GND_EARTH GND_EARTH
2 GND GND GND GND
3 RI ----------- CTS- RI
4 DTR RXD- RXD- -----------
5 CTS ----------- CTS+ -----------
6 TXD RXD+ RXD+ -----------
7 RTS ----------- RTS+ -----------
8 RXD TXD+ TXD+ DATA+
9 DSR ----------- RTS- -----------
10 DCD TXD- TXD- DATA-
CN7 CN6