D-21A Linear 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.

Specifications

• Encoding Technique - 8-position DIP switch provided for code setting
• RF Carrier Frequency - 303.875 MHz
• Current Consumption - 12 mA DC transmitting
• Operating Temperature - Battery limited
• Power - one 9-volt battery (included)
• Dimensions - 2.4" W x 4.7" H x .9" D (62 x 120 x 23 mm)

D-21A Installation Manual