Linx Technologies OTX-xxx-HH-LR8-MS - Manual (Page 7)

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Typical Applications
The signal sent by the MS Long-Range Transmitter
can be received by an LR Series receiver module
or LT Series transceiver module. The outstanding
sensitivity of the LR Series receiver offers the best
range when used with a Linx OEM transmitter. The
receiver module is then connected directly to an MS
Series decoder, which decodes the received signal.
When a button is pressed on the transmitter, a
corresponding line on the decoder goes high. This
is then connected to external circuitry to perform
whatever function is required by the application.
The decoder must learn the transmitter’s address before they can work
together. This is done by taking the LEARN line on the decoder high,
typically with a pushbutton switch. The MODE_IND line starts switching
(if a LED is attached, this causes it to flash) indicating that the decoder
is in Learn Mode. Press any of the buttons on the transmitter to initiate
a transmission. Take the LEARN line high again to exit Learn Mode and
the system is ready for use. "Figure 10: LR Receiver and MS Decoder
Schematic" on page Figure 10 shows a schematic for a typical application.
The MS Long-Range Transmitter is set to 9,600bps, so SEL_BAUD0
should be tied high and SEL_BAUD1 tied low. The decoder has several
unique features, such as Latch Mode, Receiver Control, and TX_ID.
If the LATCH line is tied to V
CC
, the outputs go high on the first
transmission, then low on the second. Figure 10 shows it tied low, so
the outputs are momentary (high for as long as a signal is received that
instructs the decoder to make them high).
The RX_CNTL line can be connected to the PDN line of the receiver and
the decoder activates the receiver with a 10% duty cycle. This greatly
reduces the average current consumption of the system. The adjacent
figure shows it tied to ground, but to use this feature, connect the RX_
CNTL line of the decoder directly to the receiver’s PDN line.
The TX_ID line outputs a number associated with the originating transmitter
/ encoder. Application Note AN-00156 shows how to use this feature.
Data guides for the receivers, the MS encoder, and the MS decoder can be
found on the Linx Technologies website at www.linxtechnologies.com.
GND
GND
VCC
NC
1
NC
2
NC
3
GND
4
VCC
5
PDN
6
RSSI
7
DATA
8
NC
9
NC
10
NC
11
NC
12
NC
13
NC
14
GND
15
ANT
16
RXM-LR
220
D6
D7
SEL_BAUD0
SEL_BAUD1
GND
GND
LATCH
RX_CNTL
TX_ID
MODE_IND D5
D4
D3
D2
VCC
VCC
D1
D0
DATA_IN
LEARN
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20
LICAL-DEC-MS001
VCC
GND
GND
VCC
Figure 9: Receiver and Decoder
Figure 10: LR Receiver and MS Decoder Schematic