FPX3-869-20 RADIOMETRIX, FPX3-869-20 Datasheet - Page 4

• Manufacturer Part Number: FPX3-869-20
• Description: MODULE, TRANSCEIVER, 500MW, UHF
• Manufacturer: RADIOMETRIX

Specifications of FPX3-869-20

• Rohs Compliant: YES

Serial interface commands
Serial data is sent to the unit on the programming input (PGM).
To successfully program the unit, it must be powered
Unlike earlier Radiometrix multichannel units, the FPX3 has separate N and R registers for each channel, on
transmit and on receive. In other words, the frequency of each channel is individually programmed in every
mode.
Commands include:
Most users will not need to edit the table which relates channel frequency, channel number and synthesizer
register programming values. The commands below are used to access the eeprom table containing this
information.
Users should be warned that, in order to get the optimum switching speed from the module, the standard
channel setup uses a different reference frequency for each channel, and the absolute calculated channel
frequency is allowed to deviate by up to +/-2KHz from the nominal
Reference frequency (10MHz/R) must be in the range 210 to 300KHz (tx) or 175 to 300KHz (rx).
As a rule of thumb, an R value greater than 45 (tx) or 55 (rx) should be viewed with suspicion.
a = single digit channel number from 0 to 7
aa = eprom location number from 0 to 31
nnnnn = a synthesizer N register value, (up to 65535)
rrrrr = the synthesizer R register value, (up to 16383)
ALL COMMANDS MUST BE IN UPPER CASE.
Notice that the synthesizer and VCO operate at half the output frequency, so for a frequency of 869.475MHz,
the actual N/R values will be set for 434.7375MHz
Further information TBA
NOTE:
Radiometrix Ltd
Commands
GOCHAN a
SETPAR
SETSER
<cr>
/
#
LOAD aa nnnnn (aa = 0 – 7)
LOAD aa nnnnn (aa = 8 – 15)
LOAD aa rrrrr (aa = 16 – 23)
LOAD aa rrrrr (aa = 24 – 31)
A pause of at least 50mS must be allowed between command strings (eeprom programming time)
Function
serial select of channel a (ch0 to 7)
channel selected by 3 bit parallel input
channel selected by most recent 'gochan' operation
process entry
clear all buffers
disable command mode
set value of N for channel a , for receive
set value of N for channel a , for transmit
set value of R for channel a , for receive
set value of R for channel a , for transmit
FPX3 Data Sheet (preliminary)
page 4