Modbus RTU temperature sensor

The sensor based on STM8F003 chip uses ADT7420 to measure temperature.

Registers table

Data	Table	Number	R/W	Range	Default
Temperature	Analog Input Registers	0x0000	R		Nan
Sensor Version	Analog Input Registers	0x0001	R	0x01...0xFF	0x01
MODBUS ID	Analog Output Holding Registers	0x0000	R/W	0x01...0x80	0x01

Tempreature request example

Request:  01 04 00 00 00 01 31 f9
Response: 01 04 02 00 f9 7d 73

Value: 0xF9 => 249
Temperature: 24.9°C

Schematic