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LMT1 Datasheet(PDF) 6 Page - Radiometrix Ltd

Part No. LMT1
Description  VHF Narrow Band FM Low Cost multi channel radio modules
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Maker  RADIOMETRIX [Radiometrix Ltd]
Homepage  http://www.radiometrix.com
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LMT1 Datasheet(HTML) 6 Page - Radiometrix Ltd

 
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Radiometrix Ltd
LMT1/LMR1 Data Sheet
page 6
Serial interface commands
2400 baud UART. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits.
Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit
does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the
e2prom will result. For this reason the user must send the 16 character string ENABLESERIALMODE
(followed by a carriage return) to activate the serial command mode before sending any of the command
strings listed below. Command mode is disabled on power down, or on reception of a # character. To
successfully program the unit, it must be enabled ('RXE high (rx) or TXE low (tx)).
GOCHAN aa
Serially select channel aa, where aa is ch0 to ch31
LOAD aa
nnnnn
Set value of N register for channel aa, where aa is Channels 0 to 31
SETPAR
Channel selected by 4 bit parallel inputs (ch0 to ch15 only)
SETSER
Channel selected by most recent GOCHAN operation
RVALUE rrrr
Set value for R register
SINGLE nnnnn
Set value of N for single channel operation.
N value NOT stored in EEPROM
<cr>
Process entry
/
Clear all buffers
#
Disable command mode
aa = a two digit channel number from 00 to 31
nnnnn = synthesizer N register value (up to 65535)
rrrr = synthesizer R register value (up to 16383)
For LMT1 Transmitter:
kHz
MHz
f
f
R
cing
channelspa
Xtal
25
10
=
=
, So R=400
6930
25
250
.
173
=
=
=
kHz
MHz
f
f
N
cing
Channelspa
RF
TX
For LMR1 Receiver:
kHz
MHz
f
f
R
cing
channelspa
Xtal
25
13
=
=
, So R=520
Notes: 1. A pause of at least 50ms must be allowed between command strings (EEPROM programming
time).
2. SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a
power down until either another valid SINGLE command is received, or mode is changed by a
GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile
applications.
3. For UK version (173.200 - 173.325MHz band) the following channel assignment is supplied:
CH0: 173.250MHz
CH1: 173.275MHz
CH2: 173.300MHz
CH3: 173.325MHz
CH4 - CH7: 173.225MHz (only used for alarm applications)
CH8 - CH31: 173.325MHz
6074
25
4
.
21
250
.
173
4
.
21
=
=
=
kHz
MHz
f
MHz
f
N
cing
Channelspa
RF
RX


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