CEStronics AccessOne TSG8 Assembly And Operating Manual page 14

5.1.6 IN1–4 analogue
For the connection of the door contact, release button, floor circuit, burglar alarm system ready to arm, burglar alarm system
armed, motion detector triggered, etc.
No. Connection
1 2.3 V
2 GND
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Function
2.3 V AC/DC
Ground. The signal voltages are measured against this cable.