In the following datasheet.
At some point it says : "If the option for synchronization is not used, the synchronization input has to be connected to ground (0 V) or the sensor must be operated via a V1 cordset (4-pin). The synchronization function cannot be activated during programming mode and vice versa."
Is ground (O V) same with -Ub (negative terminal of the power supply)? I'm kind of confused why they use different terminology.