The MAX232's success was as much a tribute to the vision of its definer, Charlie Allen, as it was to the ingenuity of its designer, Dave Bingham. Before the MAX232, RS-232 interfaces consisted of two ...

These need to be stepped down to 5 volts or less using a MAX232 chip to work with your project. Finally there’s the option of using a microcontroller running the V-USB firmware package.

The Arduino communicates with the printer through the max232 chip by converting the TTL signal to RS-232. It has a single button on top, ...