SYM76990VGGA-SP
Quick Installation Guide
4、Jumper Setting
(A)
、
Clear CMOS jumper:
Jumper
status
Short 1~2
Normal Operation (default)
Short 2~3
Clear CMOS
(B)
、
AT /ATX Power on Mode jumper:
Jumper
status
Short 1~2
ATX mode
Short 2~3
AT mode
5、COM1/COM2 RS232/422/485 setting:
Note: Mode1 /Mode2 determine that COM1 belongs to RS232/422/485
RS232
RS422
RS485
JP1
2-3
2-3
1-2
JP22
1-2
2-3
2-3
RS232
RS422
RS485
1
Carrier detect
RX+
TX -
2
Received data
RX-
TX+
3
Transmitted
TX+
NC
4
Data terminal
TX-
NC
5
GND
GND
GND
6
Data set ready
NC
NC
7
Request to send
NC
NC
8
Clear to send
NC
NC
9
Ring
NC
NC
