13 <serial port jumper setting – COMMELL HE-772 User Manual
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HE-772 User’s Manual
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2.13 <Serial Port Jumper Setting >
The board provides two RS232 serial ports, with jumper selectable RS422/485/IrDA for
COM2.
Connector: CN_COM 1/2
Type: 20-pin D-sub male connector
Pin
Description
Pin
Description
1 MDCD1-
11
DCDBTXC-
2 MSIN1-
12
SINBTXC
3 MSO1-
13
SOUTBRXC
4 MDTR1-
14
DTRBRXC-
5 Ground
15
Ground
6 MDSR1-
16
MDSR2-
7 MRTS1-
17
MRTS2-
8 MCTS1-
18
MCTS2-
9 MRI1-
19
MRI2-
10 NC
20 NC
Connector: CN_COM3/4
Type: 20-pin (10 x 2) 1.27mm x 2.54mm-pitch header for COM3/4
Pin
Description
Pin
Description
1 HS_DCD1-
11
HS
DCD2-
2 HS_RXD1
12
HS
RXD2
3 HS_TXD1
13
HS
TXD2
4 HS_DTR1-
14
HS
DTR2-
5 Ground
15
Ground
6 HS_DSR1-
16
HS
DSR2-
7 HS_RTS1-
17
HS
RTS2-
8 HS_CTS1-
18
HS
DSR2-
9 COM39
19
COM49
10 NC
20 NC