My BMS system
The BMS system finally started working.
The missing part was the so called concentrator, which interfaces several RS485 bus lines to the server through a single RS232 or USB.
The interior of the concentrator.
This is just a prototype, a proof of concept, that the SPI backbone can work. The final design will be more compact.
Close up of the line cards.
The whole stuff mounted in the rack.
The temperature sensor
The temperature sensor has three inputs. This is sufficient to mount on a heat exchanger, so it can monitor the input and output temperature, and ambient temperature.
The front of the temperature sensor
The back of the temperature sensor
The relay module
To be added.