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Installation
J6: COM2 Pin-1 Signal Selection
Use J6 jumper to set the Pin-1 signal of
COM2 to DSR# or RI#.
Connector type:
2.00 mm pitch 1x3-pin headers
Pin
Signal
1-2
Set to DSR#
short
(Default)
2-3
Set to RI#
short
JRS3~4: COM3/ COM4 RS-232/422/485 Selection
The onboard COM3 and COM4 ports
can be configured to operate in RS-
232, RS-422 or RS-485 mode.
RS-422 mode differs in the way RX/
TX is being handled. Jumper JRS3,
JRS4 switches between RS-232 or
RS-422/485 mode. When JRS3/ JRS4
is being set to operate at RS-422 or
RS-485 mode, there will be only +12V
output.
All RS-232/422/482 modes are available
on COM3/ COM4.
Connector type: 2.00mm pitch 2x3-pin headers.
Pin
1-2
3-4
5-6
3
2
3
2
RS-232 (Default)
Short
Open
Open
1
2
5
6
4
1
4
1
1
1
5
1
1
1
2
4
3
4
3
1
1
1
1
1
4
1
4
4
1
1
5
1
1
2
4
3
4
3
1
1
1
1
4
RS-422
Open
Short
Open
1
2
5
6
- 9 -
- 9 -
30
2
29
1
1
3
1
4
43
1
9
1
1
10
2
9
1
10
2
44
9
10
2
1
51
5
1
7
1
5
1
5
1
9
1
6
2
8
2
6
2
6
2
2
10
1
5
5
5
1
1
1
6
2
1
6
2
6
2
1
1
J6
8
30
2
29
1
1
1
1
1
1
9
10
JRS3
39
JRS4
40
5
1
7
1
5
1
5
1
1
9
6
2
8
2
6
2
6
2
10
2
1
5
5
5
1
1
1
6
1
6
2
6
2
2
1
1
RS-485
Short
Open
Short
1
5
1
2
1
19
1
20
2
5 6
1
25
1
1
26
2
2
1
2
1
1
2
1
1
2
1
19
20
5 6
1
25
3
1
26
4
2
1
43
1
1
2
9
1
10
2
44
9
1
2
10
2
1
51
2
6
1
2
1
2
1
2
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