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COM 1/COM 2/COM 3/COM 4 RS232/422/485 Select
JP23
JP24
JP25
JP26
JP27
JP28
JP29
JP30
COM 1 to COM 4:
RS232/422/485
All these jumpers on the system board are used to configure the COM 1 (JP15, JP23 and
JP24)/COM 2 (JP17, JP25 and JP26)/COM 3 (JP19, JP27 and JP28)/COM 4 (JP21, JP29 and
JP30) port to RS232, RS422 (Full Duplex) or RS485. The pin functions of the COM 1/COM 2/
COM 3/COM 4 port will vary according to these jumpers' setting.
Chapter 4 Jumper Settings
Chapter 4
JP15 (for COM 1)/ JP17 (for COM 2)/ JP19 (for COM 3)/ JP21 (for COM 4)
2
1
1-2 On: RS232
(default)
JP23 and JP24 (for COM 1)/ JP25 and JP26 (for COM 2)
JP27 and JP28 (for COM 3)/ JP29 and JP30 (for COM 4)
JP15
2
4
JP17
1
3
1-3, 2-4 On:
RS232 (default)
JP19
JP21
9
8
5
4
3
RS232
Note:
1. When COM 1 RS232/422/485 is selected, JP23 and JP24 must be set in accordance
to JP15.
2. When COM 2 RS232/422/485 is selected, JP25 and JP26 must be set in accordance
to JP17.
3. When COM 3 RS232/422/485 is selected, JP27 and JP28 must be set in accordance
to JP19.
4. When COM 4 RS232/422/485 is selected, JP29 and JP30 must be set in accordance
to JP21.
5. To make the RS485 auto flow control function work on COM 1 to COM 4, please
set either 8 data bits + 1 stop bit or one of the following settings:
(1) 8 data bits + 1 parity bit + 1 stop bit
(2) 8 data bits + 1 parity bit + 2 stop bits
(3) 8 data bits + 2 stop bits
26
4
6
2
4
6
3
5
1
3
5
3-4 On: RS422
Full Duplex
6
2
4
6
5
1
3
5
3-5, 4-6 On:
RS422 Full Duplex/RS485
COM 1/ COM 2/ COM 3/ COM 4
7
6
9
8
7
6
2
1
5
4
3
2
1
RS422
Full Duplex
2
4
6
1
3
5
5-6 On: RS485
9
8
7
6
5
4
3
2
1
RS485
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