MAX232
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The MAX232 is an electronic circuit that converts signals from a serial port to signals suitable for usage in e.g. microprocessor circuits.
The MAX232 is a four-channel driver; it amplifies/lowers RX,TX, CTX and RTS signals. The voltage discrepancy (up to +- 12 V from RS232 to 3.3V TTL) is generated by capacitors (typically 10 nF. An MAX232 has a typical threshold of 1.3 V, a typical hysteresis of 0.5 V, and can accept ±30-V inputs.
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