USX2 serial interface details (version 4):
PRELIMINARY
The USX2 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 :
:
?
or
/
<backspace>
<cr>
PARALLEL
DUMP
MODEM
NOMODEM
DEFCH ccc
DEFPOW pp
CHAN
ccc
POWER pp
RSSI
SHORT
empty command buffer
read back buffer contents
delete last character
process buffer
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
#
set default channel
set default tx power
jump to channel
select tx power
single read of RSSI
(non-volatile)
(non-voltatile)
(volatile)
(volatile)
(output on P3)
#
#
#
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 )
NDIV
RDIV
nnnnn
rrrrr
force N divider value
force R divider value
(volatile)
(volatile)
#
#
#
#
#
#
RLOAD rrrrr
OFFSET ooooo
LOAD aa nnnnn
START nnnnn
STEP
i
LIMIT
ccc
SETPOW eee
CALPOWER
(etc)
TEST
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 (100mW)
(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:
Parallel:
P
Serial
S
Short
1
Modem
M
IDENT
(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)
Radiometrix Ltd
USX2 Data Sheet (preliminary)
page 4
RADIOMETRIX [ RADIOMETRIX LTD ]
