TFA Dostmann KlimaLogg Pro Mode D'emploi page 170

switch point 1
- high alarm -
switch point 2
- low alarm -
C = switch point 1, high alarm
B = switch point 2, low alarm
A = ground
Comply with the technical specifications.
Please get sure, while you plug in any external hardware that this unit is
We assume no liability for damage to the KlimaLogg Pro due to incorrect
use of the hardware output or for external devices that are connected.
Note:
not under electrical power.
Jack