UHX1-144-5 Datasheet, PDF (5/7 Pages) Radiometrix Ltd – NBFM Multichannel 500mW VHF Transceiver

Commands
Function
Parallel:
P
Serial:
S
Short:
I
Modem:
M
Notes
(Channels 0-15 are individually programmed by the LOAD operation. Channels 16-127 are a
consecutive table, using the START value as a start point (=channel 16) and increasing the N value by
STEP with each increase in channel number)
ccc = a channel number from 00 to 127
aa = a two digit channel number from 00 to 15
nnnnn = synthesizer N register value, (up to 65535)
rrrrr = synthesizer R register value, (up to 16383)
pp = power setting value (3-30: a value of 30 corresponds to a power output of +27dBm)
i
= table step (increments of N) (0-7)
ooooo = receive mode frequency offset
eee = power calibration figure
N = channel frequency / (10MHz / R)
10MHz / R = 25KHz , so R = 400 (usually)
receive offset = 21.4MHz / (10MHz / R) , so = 856 (usually)
A pause of at least 50mS must be allowed after operations which result in eeprom programming
operations (all except NDIV, RDIV, GOTO, PSET and RSSI). This allows the programming cycle to
complete.
Instructions marked ' # ' output a three byte ' OK<cr> ' sequence after sucessfully completing their
eeprom programming cycles
When first powered up, the unit will operate on channel and output level specified by the last CHAN
and POWER instructions, irrespective of previous NDIV, RDIV, CHAN or PSET operations)
3. Short
A limited range of radio functions are controlled by sending a single byte to PO
0 - 127
select channel
(volatile)
128 - 159
select power
( = byte -128) (volatile)
200 single read of RSSI
(output on P3)
201 single byte read, as for IDENT command
222 reception of 16 consecutive 222 bytes returns radio to serial mode.
This mode of operation is intended to provide a simple, fast, serial command mode.
4. Modem
Commands are interpreted as in SERIAL mode (and 'short' mode may be selected.) In this mode the
unit operates as a simple 1200 baud packet modem, with TXD (in) on P2 and RXD (out) on P1.
The TXE pin does not control tx switching in this mode, but rather the presence of valid data in the tx
buffer initiates a transmit burst. No handshaking is provided, and the unit has a sufficient over-link
data rate to transparently 'stream' continuous data. Error correction, re-transmission of corrupt packets
and addressing are not provided.
This mode is compatible with other Radiometrix 'i 1200' mode equipment, including the narrow band
eval kit.
Notes:
1. Unlike in the RLC and TLC units, the LOCKSERIALMODE (and FAST) commands are non-
volatile. Once a serial mode is selected, the unit will power up in this mode until a PARALLEL
command is received.
Radiometrix Ltd
UHX1 Data Sheet (preliminary)
page 5