COMMELL HS-771 - Manual (Page 30)

HS-771 User’s Manual
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2.12 <Serial Port>
The board supports one RS232 serial port and one jumper selectable RS232/ 422/485
serial ports. The jumper JCSEL1 and JCSEL2 can let you configure the communicating
modes for COM2.
Connector: CN_COM
Type: 20-pin (2 x 10) header pitch = 2.54x1.27mm
Pin Description Pin Description
1 DCD1 2 RXD1
3 TXD1 4 DTR1
5 Ground 6 DSR1
7 RTS1 8 CTS1
9 RI1 10 N/C
11 DCD2/422TX-/485- 12 RX2/422TX+/485+
13 TX2/422RX+ 14 DTR2/422RX-
15 Ground 16 DSR2
17 RTS2 18 CTS2
19 RI2 20 N/C
CN_COM
1
20
19
2
COM Cable
COM1
COM2