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INSTALLATIONS
MAT-880 User’s Manual 11
JP4: Clear CMOS Contents
Use JP4 to clear the CMOS contents. Note that the ATX-power
connector should be disconnected from the board before clearing
CMOS.
JP4 Setting Function
Pin 1-2
Short/Closed
Normal
Pin 2-3
Short/Closed
Clear CMOS
JP5, JP6, JP7: RS232/422/485 (COM2) Selection
COM1, COM3, and COM4 are 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
JP6:
3-5 & 4-6
JP7:
3-4
JP5:
1-3 & 2-4
JP6:
1-3 & 2-4
JP7:
5-6
JP5:
1-3 & 2-4
JP6:
1-3 & 2-4
JP8: COM1 RS232 +5V / +12V Power Setting
Pin #
Signal Name JP8 Signal Name
Pin #
1 RI +12V 2
3 RI (default) RI (default) 4
5 RI
+5V 6
COM1 Settings: Pin 1-2 short = +12V, Pin 5-6 short = +5V,
Pin 3-4 short = standard COM port