– –
– –
4
5
Setting the Transmitter Address
The address is changed by using a paper clip
or probe to press the CREATE_ADDR button
on the board through the hole in the back
of the case. When the button is depressed,
an LED lights up on the front of the keyfob,
indicating that the address is being created.
The address is randomized for as long as
the button is held down. When the button is
released, the randomized address is saved
and the LED begins flashing to indicate that
the Control Permissions may now be set.
Press the buttons that the Keyfob user will have the authority to access.
Press the CREATE_ADDR button with the paper clip again or wait 17
seconds for it to time out. The address and Control Permissions are
now set. The decoder needs to learn the address before it accepts any
transmissions. Please see the Typical Applications section of this data
guide or the MS Series Decoder Data Guide for details.
Button Assignments
The Keyfob is available in five button configurations. Those configurations
and the corresponding switch numbers are shown in Figure 6. The table
shows which encoder data line has been assigned to each switch. When a
button is pressed, the data line goes high, causing the corresponding data
line on the decoder to go high if the address has been learned.
Figure 5: CREATE_ADDR Button Access
S4
S2
S1
S3
S5
S5
S2
S5
S4
S4
S2
S4
S1
S3
S2
Button
Data Line
S1
D0
S2
D1
S3
D2
S4
D3
S5
D4
Figure 6: OTX-***-HH-KF#-MS Button Assignments
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 particular frequency can
occupy airspace without contention at any given time. If two transmitters
are activated in the same area at the same time, then the signals will
interfere with each other and the decoder will not see a valid transmission,
so it will not take any action.
Battery Replacement
The transmitter utilizes a standard CR2032 lithium
button cell. In normal use, it provides several years of
operation. Access for replacement is accomplished
by gently prying apart the two halves of the Keyfob at
the seam (fingernails or a coin will do). Once the unit is
open, remove the battery by sliding it out from beneath
the retainer.
There may be the risk of explosion if the battery is
replaced by the wrong type. Replace it with the same
type of battery while observing the polarity shown in
Figure 7.
Assembly Diagram
Battery
Figure 7: Battery Access
Figure 8: OTX-***-HH-KF#-MS Assembly
CREATE_ADDR
Button Access
+
