HE-B71 User’s Manual
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2.11 <Serial Port>
The board supports five RS232 serial port and one jumper selectable RS232/422/485
serial ports. The jumper JCSEL1 & JCSEL2 can let you configure the communicating
modes for COM2.
Connector:
COM1/2
Type: 20-pin(2 x 10)header pitch = 2.54 x 1.27mm
Pin
Description
Pin
Description
1 DCD1
2 RXD1
3 TXD1
4 DTR1
5 GND1
6 DSR1
7 RTS1
8 CTS1
9 RI1
10
N/C
11 DCD2/422TX-/485-
12 RXD2/422TX+/485+
13 TXD2/422RX+
14 DTR2/422RX-
15 GND
16 DSR2
17 RTS2
18 CTS2
19 RI2
20 N/C
Setting RS-232 & RS-422 & RS-485 for COM2
Connector:
COM3/4, 5/6
Type: 20-pin(2 x 10)header pitch = 2.54 x 1.27mm
Pin
Description
Pin
Description
1 DCD1
2 RXD1
3 TXD1
4 DTR1
5 GND1
6 DSR1
7 RTS1
8 CTS1
9 RI1
10
N/C
11 DCD2
12 RXD2
13 TXD2
14 DTR2
15 GND2
16 DSR2
17 RTS2
18 CTS2
19 RI2
20 N/C
