TLM2-458-5 Datasheet, PDF (5/7 Pages) Radiometrix Ltd – NBFM Multi-channel 500mW UHF Transmitter

Version 2: programming instruction
The TLM2 provides 32 individually programmable channels
(As supplied, CH00-CH20 are programmed to 458.8 - 459.3MHz, and channels 21-31 are all set to
461.3MHz)
GOCHAN aa
TEMP aa
Serially select channel aa, where aa is ch0 to ch31
select channel aa, but revert to last GOCHAN value on next key-up
LOAD aa nnnnn
RVALUE rrrr
Set value of N register for channel aa, where aa is Channels 0 to 31
Set value for R register
<cr>
/
Process entry
Clear all buffers
aa = a two digit channel number from 00 to 31 (and it MUST be two digits, so use "01" instead of "1".etc)
nnnnn = synthesizer N register value (up to 65535)
rrrr = synthesizer R register value (up to 16383)
N = ^fRF = ^458.800MHz = 18352
f _{Channelspacing}
25kHz
R = ^fTCXO = ^13MHz , So R=520
f _{channelspacing} 25kHz
Notes:
1. A 2400 baud cmos level ‘inverted RS232 format’ (1 start bit, 8 data, 1or 2 stop bits, no parity) is
used.
2. The unit echos all bytes sent back on the P3 output.
Following any successful operation, the bytes OK <cr> are also sent back, when the unit is ready.
3. To successfully program the unit it must be in active state (txe low), so provision should be made to
force the unit into this state while programming (the third pin on the auxiliary programming connector
does this).
4. All commands except the non-volatile TEMP aa initiate an e2prom programming sequence. 50mS
must be left before the next command is sent.
5. These units employs a sub-set of the programming commands used by standard LMT module. (As
the P0 pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command string is
NOT required.)
Radiometrix Ltd
TLM2 Data Sheet
page 5