DFI HU171 - Manual (Page 13)

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13
Chapter 2 Hardware Installation
Chapter 2
COM 1 RS232/422/485 Select
JP3, JP5 and JP6 allow you to configure the Serial COM port 1 to RS232, RS422 (Full Duplex)
or RS485. The pin functions of Serial COM port 1 will vary according to these jumpers’ setting.
6
4
2
5
3
1
1-3, 2-4 On:
RS232 (default)
3-5, 4-6 On:
RS422 Full Duplex/RS485
Note:
When COM 1 RS232/422/485 is selected, JP5 and JP6 must be set in accordance to
JP3.
6
4
2
5
3
1
JP3
RS485
COM 1
1-2 On: RS232
(default)
1
3
5
2
4
6
RS422
Full Duplex
3-4 On: RS422
Full Duplex
1
3
5
2
4
6
5-6 On: RS485
1
3
5
2
4
6
RS232
2
1 9
RXD
DCD- TXD
D
TR
-
GND
DSR
-
RT
S-
CTS-
RI
-
2
1 9
RXD-
RXD+ TXD+
TXD-
NC.
NC.
NC.
NC.
NC.
2
1 9
D
ATA
-
D
ATA
+
TXD
NC.
NC.
NC.
NC.
NC.
NC.
JP5
JP3
JP6
2
1 9
COM 1: RS232/422/485
COM 1
JP5 and JP6