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12 IB850 User’s Manual
JP1: Clear CMOS Contents
Use JP1, a 3-pin header, to clear the CMOS contents. Note that the
ATX-power connector should be disconnected from the CPU card before
clearing CMOS.
JP1 Setting Function
Pin 1-2
Short/Closed
Normal
Pin 2-3
Short/Closed
Clear CMOS
JP2, JP3, JP4: RS232/422/485 (COM2) Selection
J4, COM1 is fixed for RS-232 use only.
J5, COM2 is selectable for RS232, RS-422 and RS-485.
The following table describes the jumper settings for COM2 selection.
COM2
Function
RS-232 RS-422 RS-485
Jumper
Setting
(pin closed)
JP2:
1-2
JP3:
3-5 & 4-6
JP4:
3-5 & 4-6
JP2:
3-4
JP3:
1-3 & 2-4
JP4:
1-3 & 2-4
JP2:
5-6
JP3:
1-3 & 2-4
JP4:
1-3 & 2-4
JP6: 82551 10/100Mb LAN Enable/Disable
JP6 Function
Enable LAN
Disable LAN