root node

the root node provides the other stations with power and forwards all incoming can messages between the different bus lines. each line can be switched on and off with a power mos fet. a fuse plus suppressor diode protects against short circuits and over voltage. the power drain of each line is measured through a sense resistor and an op amp. three mcp can bus controllers handle message transmittion and receiption. an avr m16 connects the mcps through a spi backplane.

sensors

power level
§0400
range [ §0402 .. §0403 ]
line 0
§0410
range [ §0412 .. §0413 ]
line 1
§0420
range [ §0422 .. §0423 ]
line 2
§0430
range [ §0432 .. §0433 ]