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INSTALLATIONS
10
MB894 User’s Manual
JP10: Processor Operating Frequency
JP10
CPU Operating
Frequency
Open
133MHz
Close
100MHz (default)
JP2, JP4, 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)
JP2:
1-2
JP4:
3-5 & 4-6
JP7:
3-5 & 4-6
JP2:
3-4
JP4:
1-3 & 2-4
JP7:
1-3 & 2-4
JP2:
5-6
JP4:
1-3 & 2-4
JP7:
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
Summary of Contents for MB894
Page 1: ...MB894 Socket 479 Pentium M Intel 855GME Micro ATX Motherboard USER S MANUAL Version 1 0...
Page 4: ...iv MB894 User s Manual This page is intentionally left blank...
Page 8: ...INTRODUCTION 4 MB894 User s Manual Board Dimensions...
Page 23: ...INSTALLATIONS MB894 User s Manual 19...
Page 30: ...INSTALLATIONS 26 MB894 User s Manual call Write_Reg watchdog enabled...
Page 56: ...BIOS SETUP 52 MB894 User s Manual This page is intentionally left blank...