🚀 go-pugleaf

>jdc@isis.cs.wayne.edu (Jon Cardwell) writes:
>+---------------
>| We're looking for sources or references for a "multi-drop serial protocol"
>| i.e. one that allows multiple devices to be attached to the same serial line.

RS-232 is not a multi-drop protocol *electrically* because it holds
the line at the mark (or space) state.  You need the RS-485 protocol
to multi-drop devices, because it lets the line float if a device
has nothing to say.  There are 232 to 485 converters available (or
there were 7 years ago).  Then you can implement a master-slave
software protocol for the universe of devices attached to the line.

In ISO terms, RS-232/485 is barely a physical layer specification.
You get to do anything you want with the rest of the layers.

Bill Hawkins