Timer tags
From PTAGISWiki
Timer tags are used to verify system operation. The timer tag is not an actual PIT tag. Rather, it is a device that emits a known PIT tag signal to detection electronics at a pre-programmed interval. This device allows operations and maintenance personnel to see a 'heartbeat' from a detection antenna during extended intervals when tagged fish are absent. Timer tags are also known as fixed reference tags. A Virtual timer tag is not a tag at all, but a specific code generated by a transceiver and routed through the antenna circuitry. In the case of a multiplexing transceiver (MUX), the same virtual timer tag code is routed to all of the active antennas.
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