The red, brown and blue wires go to the RS-232 port – see the illustration on right for connections on this side. The orange, white, green and black wires come from Raspberry Pi and provide power and data lines. I’m not going to cover the internals in detail this time, please either refer to the datasheet or my previous tutorial discussing this same chip.Ībove you can see one rather compact way to wire the MAX3232. It uses a few capacitors to deliver true +-12V RS-232 signalling on one end, and 3.3V signalling on the other. The MAX3232CPE is very much like it’s 5V sister model, MAX232. GND is also needed, and the two UART pins, TXD and RXD. We’ll use the 3.3V pin for power – the draw should not exceed 50 mA, but this should not be an issue, since MAX3232CPE draws less than 1 mA and the capacitors are rather small. The connections on Pi side are rather straightforward. Just make sure it doesn’t internally short any of the connections – use a multimeter if in doubt! I had a short 2×6 pin extension cable available and used that, but an IDE cable and other types ribbon cable work fine as well. The last item is needed to connect male-male jumper wires to RaspPi GPIO pins.
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