16
(3) COM1/COM2 (9-Pin): Serial Port Header
9
Pin 1
8 7 6
5 4 3 2
Pin NO. Definition
(RS232)
Description
Pin 1
DCD
Data Carrier Detect
Pin 2
RXD
Receive Data
Pin 3
TXD
Transmit Data
Pin 4
DTR
Data Terminal Ready
Pin 5
GND
Signal Ground
Pin 6
DSR
Data Set Ready
Pin 7
RTS
Request to Send
Pin 8
CTS
Clear to Send
Pin 9
RI
Ring Indicator