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8. Tamper Detection
The tamper detection conductor can be used to determine if the cable has been
accidentally or intentionally cut by implementing a 10k ohm pullup resistor on the
user’s OEM device that the STS.01 connects to, as shown below in Figure 3.
Figure 3
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Tamper Detection Pullup
Vlogic is the logic high supply voltage of the sensing input device. While the device's
cable is intact, the tamper detection line will be 0V. When the cable is cut, Vlogic will
be present on the tamper detection line.
The tamper detection line is connected to the Chassis Ground line of the cable and
thus to the base of the device. This signaling scheme assumes the Chassis Ground
line is connected to the same reference ground as the ground reference of the sensing
device.
Using the tamper detection line is optional. The device is fully functional if the user
decides not to use the tamper detection line. If unused tamper detect should be left
floating or tied to the same point as Chassis Ground.
