Comark RF500A - Manual (Page 28)

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Know your Transmitter
B A C
E
D
F
Figure 9 - Front view of RF512 Series Transmitter
A. Alarm LED. Flashes red to indicate any one channel in alarm
B. Active LED. Flashes green to indicate external power detected
C. Infra-Red interface. For Comark use only
D. Antenna. (Do not remove whilst in operation)
E. Lashing eye - Four available
F. Internal temperature sensor