Raveon RV-M7, Техническое руководство, Страница: 53 / 67

RV-M7 Technical Manual
53
11.6 ATST3 Command
The ATST3 command, will return the time and date the firmware in the M7 was compiled.
11.7 ATST4 Command
The ATST4 command will return internal timers that tell how long the modem has been powered up and
running. All of these timers restart a 0 upon power up.
Run time:
Years: nnn
(number of years running)
Days : nnn
(number of days running, resets to 0 after one year)
Hours: nnn
(number of hours running, resets to 0 after 23 hours, 59 minutes, 59 seconds)
Min: nnn
(number of minutes running, resets to 0 after 59 minutes, 59 seconds)
Sec: nnn
(number of seconds running, resets to 0 after 59 seconds)
Uptime:nnn
(number of seconds running. Does not reset.
OK
12. Tune-up and Alignment
Do not key the transmitter for more than 30 seconds out of every
150 seconds if the RF power is set above 2 watts.
The M7 modem has been factory calibrated, in should not require any re-calibration when installed,
or when changing frequency or channel. Unless the user is trained in radio test and calibration, the
values stored in the R registers should not be modified. Radio calibration and alignment is
performed using the
ATRx commands.
Improper adjustment of the radio calibration (R0-R9 and RA registers), can result in failure of the
radio modem.
Calibration and alignment values are stored internal to the modem in the “R” registers. (R0-R9 and
RA). For example, to read R5, issue the
ATR8 command without any parameter. To change the
setting, issue the ATR8 nn command, where nn is the new value you would like to store.
Once you read a register using an ATRx command, you may modify its value by entering a “U” for up
or a “D” for down. U or D will change the value by one. Use this trick carefully, because it modifies
the last R register that was read, and it is easy to unintentionally modify the wrong register.
12.1 Periodic Calibration
The only setting that may require adjustment is the center frequency. After years of operation, all
crystals will age and change frequency slightly. The ATR8 command is used to adjust the center
frequency. Like all narrow-band radios, semi-annual checks and adjustment of frequency is
recommended.