Kind of ummm interesting and amusing. The company where I work has around 100 CNC machines that use RS232 serial for communication for G-Code program load/saving to a single server hooked up to a box that can auto-select and auto-switch to any one of those 100 CNC machines at any time across a distance of probably about 50-100 meters using control software. So RS232 is not just for one device and not just for up to 15 meter distances and when done correctly can go beyond that even in industrial applications.....
Kind of ummm interesting and amusing. The company where I work has around 100 CNC machines that use RS232 serial for communication for G-Code program load/saving to a single server hooked up to a box that can auto-select and auto-switch to any one of those 100 CNC machines at any time across a distance of probably about 50-100 meters using control software. So RS232 is not just for one device and not just for up to 15 meter distances and when done correctly can go beyond that even in industrial applications.....