Unihedron SQM-LU-DL, Operator'S Manual

Page: 72 / 101

8 Commands and responses
Table 8.14: Response of manually setting dark calibration time period
Column Example value Description
0
z
Calibration response is being returned.
2
7
Manual Set Dark Calibration time period.
4-15
0000300.000s
Value that was set into EEPROM
16-17 Carriage return (0x0d), Line feed (0x0a).
An example of the response is:
z,7,00000300.00s
0123456789 1234567
8.3.8 Manually set dark calibration temperature
Calibration is done at the factory, however, in the case where calibration values must be restored or set to something else,
this command allows a new calibration value to be placed into the meter.
The “Dark calibration temperature” is the temperature of the meter when the meter was calibrated for its “Dark
calibration time period”.
Executing the command “
zcal8########.##x
” manually sets the light calibration offset to the value specified in
“
########.##
”. The units are
º
C.
Note: The meter records the temperature in a raw value with different resolution, so the reply back may not be exactly
the same as the value sent.
The format of the response is shown in table: 8.15:
Table 8.15: Response for manually setting of dark calibration temperature
Column Example value Description
0
z
Calibration response is being returned.
2
8
Manual Set Dark Calibration temperature.
4-9
019.0C
Value that was set into EEPROM
10-11 Carriage return (0x0d), Line feed (0x0a).
An example of the response is:
z,8,019.0C
0123456789 1
8.4 Snow LED accessory
An LED used for determining snow cover on the meter can be attached to an internal pin of the SQM-LU-DL . This LED
shines green light out of the meter and the light sensor will see a reflection if snow is covering the meter (housing cap).
The light meter reading will be unchanged with no snow present, and about 1.6
mag
arcsec
2
brighter with snow cover present.
Table 8.16: LED accessory command summary
Command Description
A50x
Turn off the Snow LED accessory.
Table continued on next page ...
72
Unihedron SQM-LU-DL Operator’s Manual -
20220119