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4.7 Serial Ports
The system provides three high speed NS16C550 compatible UARTS with Read/Receive 16 byte FIFO. Four
com ports are in IO connector.
•
COM1: CN25 DB9-pin header
•
COM2: CN26 DB9-pin header
PIN
1
2
3
4
5
6
7
8
9
•
COM2: CN27 pin header 2.0mm
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
•
COM3: CN24 for Card Reader.
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
4.8 Power Connector
Description
DATA CARRIER DETECT (DCD)
RECEIVE DATA (RXD)
TRANSMIT DATA (TXD)
DATA TERMINAL READY (DTR)
GROUND
DATA SET READY (DSR)
REQUEST TO SEND (RTS)
CLEAR TO SEND (CTS)
RING INDICATOR (RI)
Description
DATA CARRIER DETECT (DCD)
RECEIVE DATA (RXD)
TRANSMIT DATA (TXD)
DATA TERMINAL READY (DTR)
GROUND
DATA SET READY (DSR)
REQUEST TO SEND (RTS)
CLEAR TO SEND (CTS)
RING INDICATOR (RI)
N/C
+5V
N/C
+12V
GROUND
Description
GROUND
+5V
RXD3
TXD3
KB_DATA_OUT
KB_CLK_OUT
KB_DATA_IN
KB_CLK_IN
RI3
DTR3
CTS3
RTS3
DSR3
DCD3
KB_EN
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