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5.1.4 Data port
The data port(s) are implemented as Digital Circuit Terminating Equipment (DCE). The connector
used are female 9-pin D-subs.
Signal name Direction Pin
number
Carrier detect, CD From
DCE
1
Receive data,
RXD
From
DCE
2
Transmit data,
TXD
To DCE 3
Data terminal
ready, DTR
From
DCE
4
Signal ground,
GND
5
Data set ready,
DSR
From
DCE
6
Ready to send,
RTS
To DCE 7
Clear to send,
CTS
From
DCE
8
Ring indicator, RI From
DCE
9