Page 2
THEORY OF OPERATION
The CMD-HHLR-xxx Remote Command Unit combines the popular Linx LC
Series transmitter and an antenna with a commonly available encoder IC to form
a simple yet effective RF remote-control transmitter. When a button is activated
on the remote unit, power is applied to the internal circuitry and the encoder IC
is enabled. The encoder then detects the logic states of the DIP-switch address
and button data lines. These states are then formatted into a 3-word transmission
cycle which continues until the button is released. The encoder data is used to
modulate the transmitter that, through the antenna, conveys the data into free
space. The transmitted signal may be received by any Linx LC, LR or KH Series
receiver or pre-made function module. Once data is received, a decoder IC or
custom microcontroller is used to check the transmitter's address bits against the
address settings of the receiving device. If a match is confirmed, the decoder’s
output(s) are set to replicate the transmitter’s button status.
SETTING THE TRANSMITTER ADDRESS
In order to allow the formation of up
to 1024 unique Transmitter-Receiver
relationships, the transmitter’s
address may be selected using
internal DIP switches as shown. The
switches are accessed by removing
the DIP-switch access cover.
Note: If the switch is on, the address line is
connected to ground, otherwise it is floating.
The receiver's address must match in order for
the units to communicate.
CONTENTION CONSIDERATIONS
It is important to understand that only one transmitter at a time can be activated
within a reception area. While the transmitted signal consists of encoded digital
data, only one carrier of any frequency can occupy
airspace without contention at any given time.
BATTERY REPLACEMENT
The remote unit utilizes a CR-2032 Button Lithium Cell.
In normal use it will provide 1-2 years of operation.
Access for replacement is accomplished by removing the
battery access cover by pressing down firmly on the label
area and sliding it off. Once the unit is open, remove the
battery by sliding it from beneath the holder. Replace the
cell with the same type while observing the polarity
shown.
Battery Access
+
ADDRESS
A0 = 1
A1 = 2
A2 = 3
A3 = 4
A4 = 5
A5 = 6
A6 = 7
A7 = 8
A8 = 9
A9 = 10
OFF ON
To Next Page
Loading...