Chapter 2 – DFI BT160 User Manual
Page 15
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15
Chapter 2 Hardware Installation
Chapter 2
COM 4 RS232/422/485 Select
JP22, JP23 and JP25 are used to configure the COM port 4 to RS232, RS422 (Full Duplex) or
RS485. The pin functions of the COM port 4 will vary according to these jumpers’ setting.
JP22
5-6 On: RS485
COM 4
6
4
2
5
3
1
1-2 On: RS232
(default)
3-4 On: RS422
Full Duplex
JP22
6
4
2
5
3
1
6
4
2
5
3
1
Note:
When COM 4 RS232/422/485 is selected, JP23 and JP25 must be set in accordance to
JP22.
JP23
JP25
1-3, 2-4 On:
RS232 (default)
3-5, 4-6 On:
RS422 Full Duplex/RS485
RS232
2
1
9
RXD
DCD- TXD
D
TR
-
GND
DSR
-
RT
S-
CTS-
RI
-
RS422
Full Duplex
2
1
9
RXD-
RXD+ TXD+
TXD-
NC.
NC.
NC.
NC.
NC.
RS485
2
1
9
DA
TA
-
DA
TA
+
TXD
NC.
NC.
NC.
NC.
NC.
NC.
COM 4:
RS232/422/485
6
4
2
5
3
1
6
4
2
5
3
1
2
1
9