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19
Serial Port Interface
EIA-232D 25 Pin Serial Port Interface
Pin
ITU-TSS
Number
Signal
Name
1
101
2
103
3
104
4
105
5
106
6
107
7
102
8
109
15
114
17
115
18
141
20
108/2
108/1
21
140
152 Serial Port Interface
EIA
Signal/Pin
Signal
Description
Name
AA
Protective Ground
(GND).
BA
Transmitted
Data(TXD).
BB
Received
Data(RXD).
CA
Request To Send
(RTS).
CB
Clear To Send
(CTS).
CC
Data Set Ready
(DSR).
AB
Signal Ground
(GND).
CF
Data Carrier
Detected (DCD).
DB
Transmit Clock
Signal (source:
DCE).
DD
Synchronous Receive
Clock.
Local Analog
Loopback Test.
CD
Data Terminal Ready
(DTR).
Connect DCE to line.
Remote Digital Loop
Signal
Direction
DTE -DCE
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