MSR3 RADIOMETRIX [Radiometrix Ltd], MSR3 Datasheet - Page 5

• Manufacturer Part Number: MSR3
• Description: NBFM Multi-channel receiver for 868MHz SRD band
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

MSR3 serial configuration commands
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
e2prom will result. For this reason the user must send the 16-character string ENABLESERIALMODE
(followed by a carriage return) 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. You must
power the unit to successfully program it.
2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control
Notes:
Radiometrix Ltd, MSR3 Data Sheet
N
R
GOCHAN aa
LOAD aa nnnnn
SETPAR
SETSER
RVALUE rrrr
SINGLE nnnnn
<cr>
/
#
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)
f
f
Channelspa
channelspa
f
RF
f
Xtal
1. When If an N value greater than 65536 is needed then an offset of +65536 can be selected
2. A pause of at least 50ms must be allowed between command strings (EEPROM
3. /SETPAR command should be issued at the end of channel programming to put the module
4. User can modify the frequency table of 32channels to any desired frequency by changing N,
IF
cing
cing
by setting bit 15 of the R value high
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.
back into parallel frequency select mode
R values of synthesizer within 1.5MHz of factory set Channel 0 frequency subject to the
Radio Regulatory Band Allocation in the country of intended use.
13
868
25
MHz
kHz
MHz
25
, So R=520
kHz
Serial select of channel aa (0 to 31)
Set value of N for channel aa (channels 0 to 31)
Channel selected by 4 bit parallel input (0 to 15)
Channel selected by most recent 'gochan' operation
Enter 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
45
MHz
32920
page 5