Control byte for process data exchange

The control byte is transmitted from the controller to the terminal. It can be used

in register mode (REG = 1_bin) or
during process data exchange (REG = 0_bin)

The control byte can be used to carry out gain and offset compensation for the terminal (process data exchange). This requires the code word to be entered in R31. The gain and offset of the terminal can then be compensated.
The parameter will only be saved permanently once the code word is reset!

Control byte:

Bit 7 = 0_bin
Bit 6 = 1_bin: Terminal compensation function is activated
Bit 4 = 1_bin: Calibration gain
Bit 3 = 1 offset calibration
Bit 2 = 0_bin: slower cycle = 1000 ms
1_bin: fast cycle = 50 ms
Bit 1 = 1_bin: up
Bit 0 = 1_bin: down