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RS232 transceiver circuits

There are several RS232 transceiver circuit used for commond communicated between microcontroller and other devices such as PCs or devices rs232.Here is a collection of RS232 transceiver circuits that use well-known for today.

2 transistor
The circit using 2-transistor and some components RS232 transceiver.It useful for the lowest application dose not provide a long duration.

Fig 1. Transceiver with 2 transistor
MAX232 (Full Duplex)
The circuit using MAX232, Maxim’s devices.This circuit is very stable and the use of professional design. This device is inexpensive and it can provide 2-channel RS232.
The MAX232 line drivers / receivers for RS-232 and V.28 communications in harsh environments designed. Each transmitter output and receiver input is protected against? 15kV electrostatic discharge (ESD) shocks, can be operated without latchup.It from a +5 V supply voltage.

Fig 2. Use MAX232 for RS232 transceiver
DS275 (Half Duplex)
This RS232 transceiver circuit using DS275, a small half-duplex transceiver chip.I Compatible with RS-232-E signals and suitible for low-power serial transmitter / receiver for battery-
secured application.Requies no external devices.

Fig 3. Circuit to use DS257

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