RJ11 / RS232 - Know everything !

diagram RJ11 to rs232
diagram RJ11 to rs232

RJ11 - RS232


A symmetrical pin layout allows to connect two DTE, data terminal ()) directly without using a modem or other DCE data communication equipment.


The original wiring 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 ......
was developed for 25 pins.
The vast majority of applications 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 ......
use only 3 links : TX, RX and GND.

9 pins 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 ......
connectors are commonly used.
In mixed applications, a 9-to-25 converter can be used to plug in different sizes.
Two other contacts of signal, RTS and CD
The CD player
It's a drive optical drive that reads through a laser diode optical discs called CDs or CD, be it CD or computer CD-ROM. When it is used to listen to music CDs, the CD player can be integrated into various types of portable devices or servants, to a radio handset, etc. It can also be a separate, portable device or domestic, to connect to a channel Hi-Fi, an audio amplifier or headphones.
Computer, the CD playe......
are sometimes used when interfacing to modems or RJ11
RJ11
RJ11 – Regitered Jack 11 – is used for the landline. It is an international standard for connecting the fixed telephone to the telecommunications network.
RJ11 uses a 6-slot connector. In this one RJ11 has 6 slots (positions) and two drivers, the standard is written 6P2C. The information transmitted on the line can be digital (DSL) or analog. The telephone cable that arrives at the subscriber has 4 cond......
.
RJ11 DB9
1 1
4 5
5 3
3 2

For a RJ11 connection to connection RS232 since one taken DB25 :

DB9 DB25 SIGNAL INPUT/OUTPUT
1 8 DCD (DATA DETECTED) ENTRANCE 1
2 3 RXD (RECEIVING) ENTRY
3 2 TXD (TRANSMITTER) OUTPUT
4 20 DTR (DATA READY) OUTPUT 1
5 7 SG (SIGNAL GROUND) .
6 6 DSR (DATA SET) ENTRANCE 1
7 4 RTS (REQUES TO SEND) OUTPUT 1
8 5 (RESET TO SEND) CTS ENTRY 1
9 22 RI (MODEM) (RING INDICATOR) ENTRANCE 1

Adapter RJ11 to RS232
Adapter RJ11 to RS232

Presentation of the telephone connectors

POSITION RJ25 RJ14 RJ11 TWISTED PAIR RECEPTION/TRANSMISSION COLOR TWISTED PAIR COLORS RJ25
1 1 -- PAIR 3 TRANSFER WHITE/GREEN WHITE/GREEN
2 2 1 - 2 PAIR TRANSFER WHITE/ORANGE WHITE/ORANGE
3 3 2 1 1 PAIR RECEPTION BLUE BLUE/WHITE
4 3 2 - 1 PAIR TRANSFER WHITE/BLUE WHITE/BLUE
5 5 4 - 2 PAIR RECEPTION ORANGE ORANGE/WHITE
6 6 -- PAIR 3 RECEPTION GREEN GREEN/WHITE

adapter RJ11 to rs232
adapter RJ11 to rs232

Table of pin RJ11 RS232 connections

RJ11 DB9
1 1
4 5
5 3
3 2

Interior view
Interior view

Adapters

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 ......
mode, six available pins are assigned to the most 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 ......
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 the DTR, the terminal ready data and the DSR, willing to establish data signal.

On some models of the PLC, it is possible to mix the 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 ......
and RS485 communication. When the DSR and DTR signals are not used, the two pins can be used for simultaneous RS485 communication.

RJ11
RJ11
RJ11 – Regitered Jack 11 – is used for the landline. It is an international standard for connecting the fixed telephone to the telecommunications network.
RJ11 uses a 6-slot connector. In this one RJ11 has 6 slots (positions) and two drivers, the standard is written 6P2C. The information transmitted on the line can be digital (DSL) or analog. The telephone cable that arrives at the subscriber has 4 cond......
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 ......
adapters are technically simple.

They are a little expensive, found on the Web or in the specialized shops.
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