Two's complement

Values like offset are being written in Two's complement notation. This means that, when using Basic Action, a byte value (0-255) can also represent a negative value.

Byte value is converted in Two's complement:

Byte Value	Two's complement
128	-128
...	...
251	-5
252	-4
253	-3
254	-2
255	-1
0	0
1	+1
2	+2
3	+3
4	+4
5	+5
...	...
127	+127

Example: We want to program an offset of -2,5°C for sensor2 so the actual measured temperature will be displayed as follows: Display value sensor2=measured value(in °C) + (- 2,5°C). If we want to convert this to a Basic Action, we know that system values work in 0.5°C so we need to program -5. Following CLI instruction will program an offset -2,5°C for sensor 2:

basic action activate 7 2 0 251 0 0

With following instruction, you can check if the result is correct:

sensor list