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Link Interfaces Reference
The connector shown here and pinouts described here correspond to
the connector labeled "RS232/ V.24" on the back of the unit.
CCITT
Contact
Circuit
Number
Number
1
101
2
103
3
104
4
105
5
6
107
7
102
8
109
9
10
11
12
13
14
15
114
16
17
115
18
141
19
20
108.2
21
22
125
23
24
113
25
The connecting cable must be a shielded cable.
NOTE For U.K. Approval:
The connecting cable should be manufactured from Belden Cable, or a cable with equivalent specifications.
Each end must be terminated in a male 25 pin X.21 bis connector as defined in ISO-2110 1989. The cable
may be any length between 0 and 5M.
V.24 & RS232C Link Pinouts
13
25
DB25 Female DTE
Circuit
AA
BA
BB
CA
CC
AB
CF
Received Line Signal Detector (CD)
DB
Transmit Signal Element Timing (DCE Source)
DD
Receive Signal Element Timing (DCE Source)
CD
CE
DA
Transmit Signal Element Timing (DTE Source)
Figure 3 - 7 RS232 Link Pinouts
1
14
Circuit
Name
Protective Ground
Transmitted Data
Received Data
Request to Send
----------
Data Set Ready
Signal Ground
----------
----------
----------
----------
----------
----------
----------
Local Loopback
----------
Data Terminal Ready
----------
Ring Indicator
----------
----------
34
Direction
To
From
DCE DCE
NA
X
X
X
X
NA
X
X
X
X
X
X
X
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