This module is plug and play. It does not need driver. you can change
RS232 levels to TTL level easily which makes software download and serial
communication easy for STC series MCU. The 4-pin interface
are without power stealing function, external 5V power supply is
Module has two lights which are receive indicator and transmit
indicator. They will flash when receiving or sending data.
Previous MAX232 has been replaced by MAX3232 which is fully
compatible with previous features and makes operating voltage extended. 3.3V and
5V both will work correctly.