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INSTALLATIONS
10 I815E User’s Manual
Configuring the CPU Frequency
The I815E board does not provide DIP switches to configure the
processor speed (CPU frequency). However, the processor speed can be
configured inside the BIOS Setup. Refer to the BIOS Setup section in this
manual on how to change the processor speed.
JP2: Clear CMOS Contents
Use JP2, a 3-pin header, to clear the CMOS contents. Note that the
ATX-power connector should be disconnected from the board before
clearing CMOS.
JP2 Setting Function
Pin 1-2
Short/Closed
Normal
Pin 2-3
Short/Closed
Clear CMOS
JP5, JP7, JP8: RS232/422/485 (COM2) Selection
COM1 is fixed for RS-232 use only.
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)
JP7:
1-2
JP5:
3-5 & 4-6
JP8:
3-5 & 4-6
JP7:
3-4
JP5:
1-3 & 2-4
JP8:
1-3 & 2-4
JP7:
5-6
JP5:
1-3 & 2-4
JP8:
1-3 & 2-4