TLC2 Datasheet, PDF (6/11 Pages) Radiometrix Ltd – UHF Narrow Band FM Low Cost multi channel radio modules

Serial interface commands
2400 baud RS232. 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 EEPROM will result. For this reason the user must send the 16 character string
ENABLESERIALMODE to fully enable 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.
GOCHAN xx
LOAD aa nnnnn
SETPAR
SETSER
RVALUE rrrr
SINGLE nnnnn
<cr>
/
#
Serially select of channel xx, where xx is 0 to 31
Set value of N register for channel aa, where aa is Channels 0 to 31
Channel selected by 5 bit parallel inputs (4pins + jumper)
Channel selected by most recent GOCHAN operation
Set value for R register
Set value of N for single channel operation.
N value NOT stored in EEPROM
Process entry
Clear all buffers
Disable command mode
xx = a channel number from 00 to 31
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)
N _TX
=
f _RF
f _{Channelspacing}
= ^433.875MHz = 17355
25kHz
R = ^fTCXO = ^13MHz , So R=520
f _{channelspacing} 25kHz
N _RX
=
f _RF − 21.4MHz ₌ 433.875MHz − 21.4 _{= 16499}
f _{Channelspacing}
25kHz
Note:
A pause of at least 25ms must be allowed between command strings (EEPROM
programming time).
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.
Radiometrix Ltd
TLC2/RLC2 Data Sheet
page 6