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INSTALLATIONS
JP6, 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)
JP6:
3-5 & 4-6
JP7:
3-5 & 4-6
JP8:
1-2
JP6:
1-3 & 2-4
JP7:
1-3 & 2-4
JP8:
3-4
JP6:
1-3 & 2-4
JP7:
1-3 & 2-4
JP8:
5-6
JP9: COM2 RS232 Pin9 Setting
Pin #
Signal Name JP9 Signal Name
Pin #
1 RI
+12V 2
3 RI (Default) RI (Default) 4
5 RI +5V 6
COM2 Settings: Pin 1-2 short = +12V, Pin 5-6 short = +5V, Pin 3-4
RI Signal (default)
JP10: COM1 RS232 Pin9 Setting
Pin #
Signal Name JP10 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
RI Signal
MB890 User’s Manual 11