RJ45 converter to rs232 cable

RJ45 - RS232

Converters fit, for example, printers and PC.
Cables adapters are usually powered by the external 5V and convert RS232 RJ45 signals.
The tables below give the wiring :

RJ45 to RS232 schemas :

Basic wiring

RJ45	-----------------------------	DB25
4 (TXD)	-----------------------------	3 (RXD)
5 (RXD)	-----------------------------	2 (TXD)
6 (GND)	-----------------------------	7 (GND)

Wiring for printer

RJ45	----------------	DB25
4 (TXD)	----------------	3 (RXD)
5 (RXD)	----------------	2 (TXD)
6 (GND)	----------------	7 (GND)
7 (CTS)	----------------	20 (DTR)

conversion to type DB9 rs232 RJ45

Namely :

The most common protocols are supported by the converters, including TCP - IP for Windows.

The port must be set to optimize the speed of communication, otherwise it can be slow.

conversion to type DB25 rs232 RJ45

Adapters

These adapters are cheap. We find them for sale on many web sites.

Wiring DB25 for pc

RJ45	-----------------------------	PC DB25
3 (DSR)	-----------------------------	20 (DTR)
2 (RTS)	-----------------------------	5 (CTS)
4 (TXD)	-----------------------------	3 (RXD)
5 (RXD)	-----------------------------	2 (TXD)
6 (GND)	-----------------------------	7 (GND)
7 (CTS)	-----------------------------	4 (RTS)
8 (DTR)	-----------------------------	6 (DSR)

Wiring DB9 for pc

RJ45	-----------------------------	PC DB9
3 (DSR)	-----------------------------	4 (DTR)
2 (RTS)	------------------------------	8 (CTS)
4 (TXD)	------------------------------	2 (RXD)
5 (RXD)	------------------------------	3 (TXD)
6 (GND)	-------------------------------	5 (GND)
7 (CTS)	------------------------------	7 (RTS)
8 (DTR)	-------------------------------	6 (DSR)

wiring RJ45 to rs232, view a map

Adapter

Example of a converter card.