PIC to RS232 Interface


Posted on Jun 28, 2012

The circuit shown will convert logic level voltages to and from RS232 serial voltages levels. For basic serial comms between a Microchip PIC and a PC or other device you generally only need to connect the Gnd, Txd and Rxd lines. This little circuit will work with a supply voltage of 3.3v to 5v making it ideal for interfacing with a PIC



It derives the negative supply for the RS232 transmit data from the serial RS232 receive data line in a parasitic fashion. This means that the device it's connected to must use voltage levels within the RS232 specification. You can't for example connect




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