Radiometrix Ltd, MSR3 Data Sheet

page 5

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

GOCHAN aa

Serial select of channel aa (0 to 31)

LOAD aa nnnnn

Set value of N for channel aa (channels 0 to 31)

SETPAR

Channel selected by 4 bit parallel input (0 to 15)

SETSER

Channel selected by most recent 'gochan' operation

RVALUE rrrr

Enter value for R register

SINGLE nnnnn

Set value of N for single channel operation. N value NOT stored in eeprom

<cr>

Process entry

/

Clear all buffers

#

Disable command mode

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)

kHz

MHz

f

f

R

cing

channelspa

Xtal

25

13

=

=

, So R=520

1.

When If an N value greater than 65536 is needed then an offset of +65536 can be selected

by setting bit 15 of the R value high

2.

A pause of at least 50ms must be allowed between command strings (EEPROM

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.

3.

/SETPAR command should be issued at the end of channel programming to put the module

back into parallel frequency select mode

4.

User can modify the frequency table of 32channels to any desired frequency by changing N,

R values of synthesizer within

Radio Regulatory Band Allocation in the country of intended use.

32920

kHz

25

MHz

45

MHz

868

f

IF

f

N

cing

Channelspa

RF

=

−

=

−

=