LTP DPTR + Zero Tool

Good day. There is an optocoupling board LTP DPTR 1.03, sensors

The zero and the instrument height sensor, the zero and instrument height sensor are connected to one LPT pin (Z-limit / Z-probe). All sensors are connected, the machine parks to zero, everything works. However, if you also connect a zero sensor to the same connector, (an ordinary tablet), then it does not respond to
G38.2. But it reacts when parking to zero (when parking, touch the tool sensor), i.e. connected correctly. As I understand it, I need to configure the pin in the config correctly, now it is configured as home. Having tried all the options home + limits, nothing worked, just when I try to park, I get an error. ask
Sorry for the confused description. Perhaps there is experience in this problem, or at least it can prompt that it is possible to diagnose in order to understand the reason, very few people use this board ...
Thanks in advance for any help ...