RS232 isn't really suitable for multiple devices. RS485 might be a better choice, especially for 192 devices.
@RobR started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
RS232 isn't really suitable for multiple devices. RS485 might be a better choice, especially for 192 devices.