For the challenge, I wanted to send data from my computer's real serial port (RS232 9-pin connector). For that, I created an adaptor circuit because the voltages on a computer serial port are ...

An Arduino is used to decode the commands from the alarm system and interface with the SmartThings hub. The output of the IT-100 interface is RS232 at 12V levels therefore it can't be directly ...

Arduino and PLCs Hook Up Via RS232 and Modbus There is a thriving online developer community using RS232, Arduinos, and PLCs to build industrial and home automation systems on the familiar serial ...