The 5×10 cm pcb fits behind the switches in a double plug socket. The 4 pairs in the CAT cable will be used in the following way:
- Connect switch 1 to the miniserver and the backuo system (a post will follow)
- Power supply 24V (the selected switches need the 24V and I have decided – since I don’t know better – that a buck is easier than a boost)
- + 4. CAN (Since CAN bus does not allow a star topology it’ll be a long bus with a baud rate of around 100kBaud. Of course this has to be checked after installation. Wikipedia indicates that 125 kbit/s allow up to 500 meters of cable. A rough calculation )
Apart from reading switch states (maybe with double-click detection) and writing to feedback LEDs the next version of cancombase will also contain a temperature sensor.