3.2 Serial port interface
The transmitting signal from PC ranges from 12 Volts to –12 Volts (RS level) which is not compatible with the PIC microcontroller or with the RF transmitter which required a voltage setting of +5 Volts to 0 Volts (TTL level), so we must put max232 as a level shifter between RS level and TTL level .
Figure 3.2 MAX232 IC connections
Figure 3.3 Connection between serial port in PC and MAX232 IC
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