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Gantner's GT7.2500 and GT7.3500 are a commonly used reader for mainly indoor use.
The appearance of the readers is identical, what differs is the interior, 2500 has one relay and one optocoupler (feedback) while 3500 has two relays and two optocouplers (feedback).
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Manual:
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Datasheet:
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Installation and Commissioning
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Common installation scenarios
Digital inputs and outputs
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