Comark RF500A - Manual (Page 30)

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Transmitter Display
RF500 transmitters all have a liquid crystal display as shown below. Only RF512 is capable of using all three display
areas and annunciators.
Indicates that the door channel
reads open.
Indicates that the internal lithium battery
requires replacement.
Indicates an unacknowledged alarm on any channel.
When steady, indicates that the transmitter has logged
onto the Gateway.
When flashing, indicates the transmitter is currently
attempting transmission with the Gateway.
Indicates that the sensor or probe is broken.
Indicates that the number to be displayed is too big to fit
on the LCD. E.g. 2000 cannot be shown on a “1999” digit area.

INT
EXT1
EXT2
Figure 12 - Transmitter Display