The data port(s) are implemented as Data Communications Equipment (DCE). The connector
used are female 9-pin D-subs.
Signal name
Direction
Carrier detect, CD
From
DCE
Receive data,
From
RXD
DCE
Transmit data,
To DCE
TXD
Data terminal
From
ready, DTR
DCE
Signal ground,
GND
Data set ready,
From
DSR
DCE
Ready to send,
To DCE
RTS
Clear to send,
From
CTS
DCE
Ring indicator, RI
From
DCE
Pin
number
1
2
3
4
5
6
7
8
9
Peripheral Equipment
217