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RS-232/V.24 Connections
Pin outs for the 25-pole D-sub and 9-pole screw terminal:
25-pos. Screw
D-sub
Terminal
1
2
8
3
7
4
6
5
5
6
2
7
1
8
4
9
10
12
15
17
20
3
21
22
9
23
24
25
The other pins in the 25-pole D-sub should be left unconnected.
1
:
6
1
2
3
4
2-wire lines are connected to the two middle pins (3 & 4)
in the RJ-12 plug or the TX screws (1 & 2).
In the UK modems the 2-wire line is connected to pin 2 & 5
in the RJ-12 connector.
4-wire lines are connected to the screw terminal, transmitter
to TX (1 & 2) and receiver to RX (3 & 4).
6178-2203
Direction
Name
DCE-DTE
- - -
PE
←
TXD
RXD
←
RTS
CTS
DSR
- - -
SG
DCD
DRS
TXC
RXC
←
DTR
←
RDL
RI
←
DRS
←
EXC
TI
Line connection
The telephone line is connected to the 6-pole RJ-12
connector or to the 4-pole screw block in the bottom
left side.
When using the screw-block a strap plug supplied must
be placed in the RJ-12 connector.
If this is not done the outgoing signal will not be
connected to the screw-block.
Description
Protective earth
Transmit data
Receive data
Request to send
Clear to send
Modem ready
Signal ground
Data carrier detect
Continuous high
Continuous low
Speed indication (1200/2400)
Synchronous TXD clock from modem
Synchronous RXD clock from modem
Data terminal ready
Request of remote digital loop back
Ring indicator
Data speed select (1200/2400)
External synchronous clock
Test indication signal
7
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