IBASE Technology MB892, User Manual

Page: 14 / 66

INSTALLATIONS
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
10 MB892 User’s Manual