COMMELL HE-B71 - Manual (Page 27)

HE-B71 User’s Manual
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2.11
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