Evaluating the CO2-Sensor S8 from SenseAir.

Code for Arduino with some routines to read all register.

Technical information: There is no standard library aviable now - since the functionality / documentation is poor. The flow is very simple: Send a request like {0xFE, 0X04, 0X00, 0X03, 0X00, 0X01, 0XD5, 0XC5} and wait for the response like {0xFE, 0X04, 0X02, 0X03, 0X88, 0XD5, 0XC5}.
Where byte 0 FE any Address
1 04 function code (03 read hold reg / 04 read inp. register / 06 write)
2,3 00 03 starting Address
4,5 00 01 lenght of requested register
6,7 D5 C5 CRC low / high