Selecting an Interface Cable
133
The V.24 Interface
The V.24 interface pin-out diagram and signal definitions and names are shown below.
Pin # Signal
Name
Direction
CCITT #
1
PGND
Protective Ground
Common
101
2
TXD
Transmit Data
Output
103
3
RXD
Receive Data
Input
104
4
RTS
Request to Send
Output
105
5
CTS
Clear to Send
Input
106
6
DSR
Data Set Ready
Input
107
7
SGND
Signal Ground
Common
102
8
DCD
Data Carrier Detect
Input
109
15
TCLK
Transmit Clock (DCE)
Input
114
17
RCLK
Receive Clock
Input
115
18
TEST
Local Loopback Activation
Output
141
20
DTR
Data Terminal Ready
Output
108
21
RLB
Remote Loopback
Output
140
22
RI
Ring Indicator
Input
125
24
DTECLK
Transmit Clock (DTE)
Output
113
25
TI
Test Indicator
Input
142
