DFI EC300 Series - Manual (Page 72)

72
4
Jumper Settings
EC300/310/320/321-CR4G65
JP3 JP1
COM 4
(JP3)
COM 3
(JP1)
1-2 On: RS232
(default)
3-4 On: RS422
Full Duplex
5-6 On: RS485
6 4 2
5 3 1
JP1 (for COM 3) and JP3 (for COM 4) are used to confi gure 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.
JP1 / JP3
6 4 2 6 4 2
5 3 1 5 3 1
COM 3 / COM 4
DCD TXD RXD DT
R
GND
1 2 3 4 5
RX+ TX+ RX
-
TX
-
GND
1 2 3 4 5
D
ATA
+
N.C. D
ATA
-
N.C. GND
1 2 3 4 5
COM 3 and COM 4 RS232/RS422/RS485 Select
6 8 9 7
DSR CT
S
RT
S
RI
6 8 9 7
N.C. N.C. N.C. N.C.
6 8 9 7
N.C. N.C. N.C. N.C.