Dfi EC300 Series Manual de usuario Pagina 102

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102
5
Ports and Connectors
COM 3 and COM 4 RS232/Power Select
JP2 and JP4 are used to con gure COM 3 and COM 4 to pure RS232 or RS232
with power.
The pin function of COM 3 and COM 4 will vary according to JP2’s and JP4’s set-
ting respectively.
JP2 / JP4
COM 3 / COM 4
1-3, 2-4 On:
RS232 (default)
64
2
531
3-5(+12V), 4-6(+5V) On:
RS232 with power
64
2
531
DCD
TXD
RXD
DTR
GND
12345
DSR
+5V
TD
RD
DTR-
GND
12345
6789
689
7
CTS
RTS
RI
RTS-
+12V
DSR-
CTS-
JP4
JP2
COM 4
(JP4)
COM 3
(JP2)
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