DigiReader Series
P/N 6600025, R
EV
. D 15
TAMPER SIGNAL (S-NET ONLY)
DR4200 Series DigiReaders send a tamper signal to an S-Net-based Controller each time an
address switch (SW1 or SW2, described above) is changed. (The DR4201, DR4208S, and DR4220
have separate physical tamper switches.)
Table 10: Tamper Switch(es)
S-NET CONNECTIONS
The S-Net is an RS485 serial network for communication between the Controller and node devices.
Typically, the cable used is two twisted pairs with an overall shield; one pair is for data, the other
pair is for DC power. Terminate the last S-Net device with a 120-ohm, ¼ watt resistor or termination
jumper as shown in Figure 5. The maximum S-Net length is 4000 feet (1200 meters).
Figure 5: S-Net Wiring
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