RS232 Driver

RS232 Transceiver Circuits

There are several RS232 transceiver circuit which common used for communicated between micro controller and other devices such PC or any devices that use RS232. Here is a collection of RS232 transceiver circuits that popular for today.

2 transistor
The circuit below use 2 transistor and some components to provide RS232 transceiver. It useful for cheap application that dose not long length.

Transceiver with 2 transistor

Fig 1. Transceiver with 2 transistor

MAX232(Full duplex)

The circuit below use MAX232 which is the MAXIM’s devices.This circuit is very stable and use for professional design. This device is inexpensive and it can provides 2 channel for RS232 .
The MAX232 line drivers/receivers are designed for RS-232 and V.28 communications in harsh environments. Each transmitter output and receiver input is protected against 15kV electrostatic discharge (ESD) shocks, without latch up.It can operate from a Single +5V Power Supply.

MAX232 for RS232 transceiver

Fig 2. Use MAX232 for RS232 transceiver

DS275(Half Duplex)

This RS232 transceiver circuit use DS275 which is a small half duplex transceiver chip. I Compatible with RS–232–E signals and suitable for Low–power serial transmitter/receiver for battery-
backed application. Requires no external devices.

Circuit to use DS257

Fig 3. Circuit to use DS257