CALL METERING SERVICES APPLICATIONS
Ed. 0426/30 Réf. 3EH 21000 BSAA
ANNEX: V24 CONFIGURATIONS
V24 Signals
Functions performed by the various managed circuits (indications for 25-point connectors)
(*): pin not assigned in standard EIA-RS232
101 (1): Protection Ground (PG)
This pin ensures continuity between the earth on the cable and on the optional board (the protection
and signal grounds are in this case connected to a joint reference).
Female socket
(view from behind station)
DSR
CTS
RTS
RD
TD
PG
TI RI
DTR
LL
13
25
1
14
DCD
SG
RTS
RD TD
5
6
1
9
0V
CTS
No of
pin
No of
circuit
Meaning
Abbreviation
Direction
7 102
2 103
3
4
5
6
20
8
22
104
105
106
107
108/2
109
125
18
141
DTE --> DCE
DTE <-- DCE
DTE
DTE
DTE
DTE
DTE
DTE
-->
<--
<--
<--
<--
-->
DCE
DCE
DCE
DCE
DCE
DCE
DTE -->
DCE
TS
CCITT EIA
ED
RD
DPE
PAE
PDP
TPD
DS/DP
IA
25
142
BL
IT
SG
TD
RD
RTS
CTS
DSR
DTR
DCD
RI
LL
TI DTE <-- DCE
1 101 PG
TP
108/1
DTE -->
DCECPD (*)
Protection Ground
Signal Ground
Transmit Data
Receive Data
Request To Send
Clear To Send
Data Set Ready
Connect Data Set
Data Terminal Ready
Data Carrier Detect
Ring Indicator
Local Loop
Test Indicator