RJ11 ⇾ RS232 - Everything you need to know !

RJ11 to RS232 wiring diagram
RJ11 to RS232 wiring diagram

RJ11 - RS232


A symmetrical pin layout allows two DTEs (data terminals) to be connected directly without the use of a modem or other DCE data communication equipment.

The original RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
wiring was developed for 25 pins.
The vast majority of RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
applications use only 3 links : TX, RX, and GND.

9-pin RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
connectors are commonly used.
In mixed applications, a 9 to 25 converter can be used to connect sockets of different sizes.
Two other signal contacts, RTS and CD, are sometimes used when interfacing to modems or to RJ11
RJ11
RJ11 - Registered Jack 11 - is used for the landline telephone. It is an international standard that is used to connect the landline telephone to the Telecommunications network. RJ11 uses a 6-slot connector. In it RJ11 has 6 slots (positions) and two conductors, the standard is written 6P2C.
The information transmitted on the line can be digital (DSL) or analog.
.
RJ11DB9
11
45
53
32

For an RJ11 link to an RS232 connection from a DB25 socket :

DB9 DB25 SIGNAL INPUT/OUTPUT
18DCD (DATA DETECTED) INPUT 1
23RXD(RECEIVER)INPUT
32TXD(TRANSMITTER) OUTPUT
420DTR (DATA READY) OUTPUT 1
57SG (GROUND SIGNAL)
66DSR (DATASET READY) INPUT 1
7 4 RTS (REQUES TO SEND) OUTPUT 1
85CTS (RESET TO SEND) INPUT 1
922RI(MODEM) (RING INDICATOR)INPUT 1

Overview of Telephone Connectors

position RJ11 contactor no. RJ12 contactor no. RJ25 contactor no. Twisted Pair No. T \ R colors France U.S. colors colours Germany Old Colors
1 . . 1 3 T
I_____I
████
I_____I
ou
████
████
I_____I
2 . 1 2 2 T
I_____I
████
████
████
████
3 1 2 3 1 R
████
I_____I
████
I_____I
████
4 2 3 4 1 T
I_____I
████
████
████
████
5 . 4 5 2 R
████
I_____I
████
████
████
6 . . 6 3 R
████
I_____I
████
ou
████
████
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Single-pin RJ11-RS232 patch panel

RJ11 to rs232 adapter
RJ11 to rs232 adapter

 

RJ11DB9
11
45
53
32

Interior view
Interior view

Adapters

In full RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
mode, the six available pins are assigned to the most commonly used RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
signals. Pins 1 and 6 are, however, reassigned to lines A and B when the port is used in RS485 mode.
These pins are normally used for DTR, Data Ready Terminal, and DSR, Signal Ready for Data Establishment.

On some PLC models, it is possible to mix RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
and RS485 communications. When DSR and DTR signals are not in use, both pins can be used for simultaneous RS485 communication.

RJ11
RJ11
RJ11 - Registered Jack 11 - is used for the landline telephone. It is an international standard that is used to connect the landline telephone to the Telecommunications network. RJ11 uses a 6-slot connector. In it RJ11 has 6 slots (positions) and two conductors, the standard is written 6P2C.
The information transmitted on the line can be digital (DSL) or analog.
to RS232
RS232
For a serial line information arrive at regular intervals (synchronous) or at random intervals (asynchronous). Between a transmitter (DTE) and a receiver (DCE) wiring is right. RS232 cables can be connected in series.
In configurations where 2 DTE are directly connected, a cable of cross linking or \Null-Modem\ should be used. This cable has female connectors at each end.
adapters are technically simple.
They are inexpensive, they can be found on the web or in specialized shops.

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