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.
The circuit below use 2 transistor and some components to provide RS232 transceiver. It useful for cheap application that dose not long length.
Fig 1. Transceiver with 2 transistor
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.
Fig 2. Use MAX232 for RS232 transceiver
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.
Fig 3. Circuit to use DS257