RJ45 / RS232 Adapter - Techniques and applications

RJ45 converter to rs232 cable
RJ45 converter to rs232 cable

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
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
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
wiring RJ45 to rs232, view a map

Adapter

Example of a converter card.

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