Jp1: Atx/At Mode Select; Jp2, Jp3, Jp4: Rs232/422/485 (Com2) Selection - Global American 2808120 User Manual

JP1: ATX/AT Mode Select

JP2, JP3, JP4: RS232/422/485 (COM2) Selection

COM1/3/4 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.
Function
(pin closed)
COM2 is jumper selectable for RS-232, RS-422 and RS-485.
Pin #
11
13
15
17
19
12
14
16
18
20
JP1
COM2
RS-232
JP4:
1-2
Jumper
JP3:
Setting
3-5 & 4-6
JP2:
3-5 & 4-6
Signal Name
RS-232
DCD
RX
TX
DTR
Ground
DSR
RTS
CTS
RI
NC
2808120 User's Manual
ATX / AT
ATX mode
AT mode
RS-422
JP4:
3-4
JP3:
1-3 & 2-4
JP2:
1-3 & 2-4
R2-422 RS-485
TX- DATA-
TX+ DATA+
RX+ NC
RX- NC
Ground Ground
RTS- NC
RTS+ NC
CTS+ NC
CTS- NC
NC NC
RS-485
JP4:
5-6
JP3:
1-3 & 2-4
JP2:
1-3 & 2-4
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