Try our re-instated info resource - "Aladdin's Cave" (Main menu)- sorry it's taken so long to fix
Yes Ted,"it has the look of the SAM units (Signal Aquistion Modules) that MB use on their cars." That's probably their version, or description, of canbus in which they send just a single positive supply to each area (like a ring main) and then command the components by pinging code from central ECU to call status on or off. Also similar to ethernet over powerline data systems used in domestic router distribution.