UHX1-144-5 Datasheet, PDF (4/7 Pages) Radiometrix Ltd – NBFM Multichannel 500mW VHF Transceiver

Serial interface commands
The UHX1 user interface is accessed through the four parallel pins (P0/serial through P3).
It has four operating modes:
1. Parallel.
Frequency of operation is selected as one of 16 (chans 0-15), by means of a 4 bit inverted value applied
to P0-P3. The P0 pin will also respond to a LOCKSERIALMODE datastream (inverted rs232, 9600
baud), which will cause the radio to enter serial mode. In parallel mode, the IDENT command string is
still decoded, but the unit remains in parallel mode.
2. Serial
Frequency of operation, radio set up, power output and various other parameters are controlled by
command strings sent to P0. Pin P3 functions as a 'readback' port while P1,2 are not used in this mode.
In this mode, decimal values are used (to simplify direct manual programming via a terminal)
Commands include:
Commands
Function
Notes
:
empty command buffer
? or /
read back buffer contents
<backspace>
delete last character
<cr>
process buffer
PARALLEL
DUMP
MODEM
NOMODEM
return to the basic, parallel mode (and turn
modem off)
read back contents of EEPROM (output on P3)
activate 1200 baud modem
#
de-activate 1200 baud modem
#
DEFCH ccc
set default channel (non-volatile)
#
DEFPOW pp
set default tx power (non-voltatile)
#
CHAN ccc
POWER pp
RSSI
jump to channel (volatile)
select tx power (volatile)
single read of RSSI (output on P3)
SHORT
enter short command mode
#
(The following commands are used to set up the radio operating characteristics, and should be viewed
with caution. Especially the CALPOWER command, which initiates a multiple write operation to the
power calibration table )
Commands
NDIV nnnnn
RDIV rrrrr
RLOAD rrrrr
OFFSET ooooo
LOAD aa nnnnn
START nnnnn
STEP i
LIMIT ccc
SETPOW eee
CALPOWER (etc)
TEST
IDENT
Radiometrix Ltd
Function
force N divider value (volatile)
force R divider value (volatile)
Set R divider value
Set RX offset
Set N values for first 16 channels
Set N value for ch 16
Set increment for table
Set highest permitted channel number
Set maximum power output (500mW)
(see factory procedures for more details)
Generate a 250Hz test modulation (only fuctions in
TX mode, cancelled by sending a <cr> byte)
Readback a single byte, depending on current
mode:
UHX1 Data Sheet (preliminary)
Notes
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