Chapter 2 – DFI HD636-H81CS User Manual
Page 17
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17
Chapter 2 Hardware Installation
Chapter 2
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COM 8 RS232/422/485 Select
JP2, JP17 and JP18 are used to configure the COM port 8 to RS232, RS422 (Full Duplex) or
RS485.
The pin functions of the COM port 8 will vary according to these jumpers’ setting.
JP17
JP2
COM 8:
RS232/422/485
6
4
2
5
3
1
6
4
2
5
3
1
JP2
5-6 On: RS485
6
4
2
5
3
1
1-2 On: RS232
(default)
3-4 On: RS422
Full Duplex
6
4
2
5
3
1
6
4
2
5
3
1
JP17 and JP18
1-3, 2-4 On:
RS232 (default)
3-5, 4-6 On:
RS422 Full Duplex/RS485
RS232
RXD
DCD- TXD
D
TR
-
GND
DSR
-
RT
S-
CTS-
RI
-
RS422
Full Duplex
RXD-
RXD+ TXD+
TXD-
NC.
NC.
NC.
NC.
NC.
RS485
DA
TA
-
D
ATA
+
NC.
NC.
NC.
NC.
NC.
NC.
COM 8
JP18
10
2
1
9
10
2
1
9
10
2
1
9
10
2
1
9
Note:
When COM 8 RS232/422/485 is selected, JP17 and JP18 must be set in accordance to
JP2.
NC.
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