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Unihedron

SQM-LU Users manual

10 Glossary

EEPROM

Electrically Erasable Programmable Read Only Memory is a type of memory that
retains its contents after the power has been removed. This type of memory has a
limited write/erase cycle as well as a lifetime for data retention. .In the SQM-LU, the
parameters in the micro-controller can be written 1 million times and last for 100
years.

SQM-LU

Sky Quality Meter with lens and USB connectivity.

USB

Universal Serial Bus

Revision 1.1

Page 27

Last modified: Jun 18, 2011

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Содержание SQM-LU

Страница 1: ...Sky Quality Meter Lens USB SQM LU User manual...

Страница 2: ......

Страница 3: ...temperature 14 4 2 9 Manually set dark calibration time period 15 4 2 10 Manually set dark calibration temperature 16 4 2 11 Setting interval reporting parameters 17 4 2 11 1 Interval reporting period...

Страница 4: ...e 9 Table 5 Dark calibration response 10 Table 6 Disarm calibration response 11 Table 7 Unit information request response 12 Table 8 Response for manual setting of light calibration offset 13 Table 9...

Страница 5: ...e microcontroller The microcontroller responds to commands by sending data strings to the USB interface which are then relayed to the PC 1 1 Quick start 1 Your computer must have the FTDI VCP driver i...

Страница 6: ...olute precision of each meter is believed to be 10 0 10 mag arcsec The difference in zeropoint between each calibrated SQM L is typically 10 0 10 mag sq arcsec Power requirement 18mA from the 5V USB c...

Страница 7: ...mands can be sent to the SQM LU using a serial terminal emulator to the serial communications port that the device routes to When connecting the SQM LU to a PC where the FTDI device driver is loaded t...

Страница 8: ...ts a sequence of characters as a command then executes those commands and usually provides a response of a sequence of characters 4 1 Commands Commands consist of a string of characters The first char...

Страница 9: ...ller see bootloader Hexadecimal value 19 Intel Hex firmware upgrade initiation see bootloader P x Set period in seconds for interval reporting to EEPROM and RAM for booting and immediate use Firmware...

Страница 10: ...10 21 0000022921Hz Frequency of sensor in Hz 23 33 0000000020c Period of sensor in counts counts occur at a rate of 460 8 kHz 14 7456MHz 32 35 46 0000000 000s Period of sensor in seconds with millisec...

Страница 11: ...h millisecond resolution 28 34 039 4C Temperature in degrees C measured during light calibration Leading space for positive value Leading negative sign for negative value 36 47 00000008 71m Offset of...

Страница 12: ...calibrated light source of approximately 13 5fc is supplied to the sensor The format of the response is Column Example value Description 0 z Indicates that a Calibration response is being returned 1...

Страница 13: ...that the period is correct after entering the dark environment it could take a few minutes to collect an accurate dark period A dark period of only a few seconds is too small The format of the respon...

Страница 14: ...e Description 0 z Calibration response is being returned 1 x All calibration modes 2 d Disarmed 3 L L Locked Wait for unlock before calibrating after Arm command firmware upgrades are disabled U Unloc...

Страница 15: ...to from the SQM LU The protocol version is independent of the feature version 11 18 00000003 Model number 8 digits The model value identifies the specific hardware model that the firmware is tailored...

Страница 16: ...ually sets the light calibration offset to the value specified in The units are magnitudes arcsecond 2 The format of the response is Column Example value Description 0 z Calibration response is being...

Страница 17: ...e specified in The units are C Note The SQM LU 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 respon...

Страница 18: ...x manually sets the light calibration offset to the value specified in The units are in seconds The format of the response is Column Example value Description 0 z Calibration response is being return...

Страница 19: ...pecified in The units are C Note The SQM LU 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...

Страница 20: ...A reading of 0 00m means that the light at the sensor has reached the upper brightness limit of the unit 10 21 0000022921Hz Frequency of sensor in Hz 23 33 0000000020c Period of sensor in counts coun...

Страница 21: ...irmware clears resets the micro controller effectively copying the EEPROM values into RAM 4 2 11 1 Interval reporting period setting Executing the command P x note upper case P sets the period of the...

Страница 22: ...erval period that was set into EEPROM 14 24 0000300360s Interval period that was set into RAM 26 37 00000017 60m Threshold value that was set into EEPROM 39 50 00000017 60m Threshold value that was se...

Страница 23: ...e to keep the domes clean every so often and to make sure that the mounting plane is painted black to that it doesn t reflect light back to the inside of the dome and then back into the meter Source o...

Страница 24: ...nual offset of 0 15 should be applied to all readings 6 3 Cover maintenance Keep the covering clean of dust water ice and bird droppings Revision 1 1 Page 22 Last modified Jun 18 2011 Illustration 4 E...

Страница 25: ...FTDI interface has not been altered from its default There should be no reason to alter the FTDI chip settings The baud rate is defined by the VCP driver side when a terminal program connects to the S...

Страница 26: ...03 PID_6001 Serial_Number 0000 PortName For Windows 98 and Windows ME look here for your device HKEY_LOCAL_MACHINE SYSTEM Enum FTDIBUS VID_0403 PID_6001 Serial_Number 0000 PortName The Serial_Number i...

Страница 27: ...Unihedron SQM LU Users manual Revision 1 1 Page 25 Last modified Jun 18 2011...

Страница 28: ...mpany contact information Mailing address Unihedron 4 Lawrence Avenue Grimsby Ontario L3M 2L9 Canada Telephone 905 945 1197 Fax 905 945 6770 Website unihedron com Email info unihedron com Revision 1 1...

Страница 29: ...he power has been removed This type of memory has a limited write erase cycle as well as a lifetime for data retention In the SQM LU the parameters in the micro controller can be written 1 million tim...

Страница 30: ...al SQM LE product release 4 Interval report reading includes serial number at end SQM LE 11 3 Feature revision history Revision Description 9 Initial SQM LE product release 10 Power up default reset f...

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