Com 1/ com 2 rs232/422/485 select, Com 1 / com 2 rs232/power select, Chapter 4 – DFI DT122-CR Manual User Manual
Page 19: Chapter 4 jumper settings
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19
Chapter 4 Jumper Settings
Chapter 4
COM 1/ COM 2 RS232/RS422/RS485 Select
5-6 On: RS485
JP4 (for COM1) and JP5 (for COM2) are used to configure the COM ports to RS232, RS422
(Full Duplex) or RS485.
The pin function of the COM ports will vary according to the jumper’s setting.
JP4/JP5
6
4
2
5
3
1
COM 1
COM 2
JP4
JP5
RS232
RS422
Full Duplex
RS485
COM 1
DCD-
TD
RD
DT
R-
GND
1 2 3 4 5
RT
S
-
RI
-
DSR
-
CT
S-
6 7 8 9
D
ATA
+
N.C.
D
ATA
-
N.C. N.C.
1 2 3 4 5
N.C.
N.C.
N.C.
N.C.
6 7 8 9
RXD+
TXD+
RXD-
TXD- N.C.
1 2 3 4 5
N.C.
N.C.
N.C.
N.C.
6 7 8 9
6
4
2
5
3
1
1-2 On: RS232
(default)
3-4 On: RS422
Full Duplex
6
4
2
5
3
1
JP1
JP3
2 4 6
1 3 5
2 4 6
1 3 5
1-3, 2-4 On: RS232
(default)
3-5 (+5V), 4-6 (+12V)
On: RS232 with power
1-3, 2-4 On: RS232
(default)
3-5 (+5V), 4-6 (+12V)
On: RS232 with power
2
1 3 5
4 6
1 3 5
2 4 6
COM1/COM2 RS232/Power Select