16
JP2, JP3, JP4: 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 describes the settings for COM2.
COM2
Function
RS-232
RS-422
RS-485
Jumper
Setting
(pin closed)
JP4:
1-2
JP2:
3-5 & 4-6
JP3:
3-5 & 4-6
JP4:
3-4
JP2:
1-3 & 2-4
JP3:
1-3 & 2-4
JP4:
5-6
JP2:
1-3 & 2-4
JP3:
1-3 & 2-4
COM2 is jumper selectable for RS-232, RS-422 and RS-485.
Pin # Signal Name
RS-232 R2-422
RS-485
11
DCD
TX-
DATA-
13
RX
TX+
DATA+
15
TX
RX+
NC
17
DTR
RX-
NC
19
Ground
Ground
Ground
12
DSR
RTS-
NC
14
RTS
RTS+
NC
16
CTS
CTS+
NC
18
RI
CTS-
NC
20
NC
NC
NC
JBAT1: Clear CMOS Setting
JBAT1
Setting
Normal
Clear CMOS
