DFI EC300 Series - Manual (Page 73)

73
4
Jumper Settings
COM 3 and COM 4 RS232/Power Select
JP2 and JP4 are used to confi 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)
6 4 2
5 3 1
3-5(+12V), 4-6(+5V) On:
RS232 with power
6 4 2
5 3 1
DCD TXD RXD DT
R
GND
1 2 3 4 5
DSR
+5V TD RD DT
R
-
GND
1 2 3 4 5
6 7 8 9 6 8 9 7
CT
S
RT
S
RI
RT
S
-
+12V DSR
-
CT
S-
JP4 JP2
COM 4
(JP4)
COM 3
(JP2)