Linear D-21A Normally Open Wall-mount Transmitter
The Model D-21A Normally Open Wall-mount Transmitter has a normally open input circuit that operates in conjunction with an externally mounted normally open magnetic or mechanical contact. When the external contact closes, the transmitter automatically transmits a two-second digitally coded signal to a companion standard digital receiver. Pressing the test pushbutton on the front of the transmitter will also cause the transmitter to send a signal. Each transmission causes the red LED indicator on the front of the transmitter to light, showing that the transmitter is sending a signal and that the battery is in good condition.
Features
- Slimline case design
- Test/operate switch
- Test/operate LED
- 2-second transmission
- Standard digital format: 256 selectable codes
- One N/O input loop circuit
- Loop input screw terminals
- Powered by one 9-volt battery (included)
- Current consumption: 12 mA transmitting
- RF frequency: 303.875 MHz
- 2.4" W x 4.7" H x 0.9" D
- Order number: SNT00004
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