Cables and Pin Assignments
C-3
7520-A2-GB20-20
May 1998
EIA-232 User Data Port Connector
The following table provides the pin assignments for the 25-position
EIA-232 connector to the user data terminal equipment.
Signal
ITU
CT #
Direction
25-Pin
Socket
Connector
Transmitted Data ( TXD )
103
To DSU (In)
2
Received Data ( RXD )
104
From DSU (Out)
3
Request to Send ( RTS )
105
To DSU (In)
4
Clear to Send ( CTS )
106
From DSU (Out)
5
Data Set Ready ( DSR )
107
From DSU (Out)
6
Signal Ground/Common
102
—
7
Received Line Signal Detector/Carrier
Detect ( RLSD/CD )
109
From DSU (Out)
8
Transmitter Signal Element Timing –
DCE Source ( TXC )
114
From DSU (Out)
15
Receiver Signal Element Timing –
DCE Source ( RXC )
115
From DSU (Out)
17
Local Loopback ( LL )
141
To DSU (In)
18
Data Terminal Ready ( DTR )
108/1, /2
To DSU (In)
20
Remote Loopback ( RL )
140
To DSU (In)
21
Transmitter Signal Element Timing –
DTE Source ( XTXC or TT )
113
To DSU (In)
24
Test Mode Indicator ( TM )
142
From DSU (Out)
25
Содержание 7520
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