7 Unihedron Device Manager
GPS on Mac
To get the Communications Port for a USB connected GPS to a Mac computer:
1. Follow the instructions for driver installation on the CD provided with the GPS
2. Connect the GPS
3. Open a terminal window
4. Type in:
ls -altr /dev/*
to look for the most recently created file that looks something like
cu.usbserial
5. The newly connected GPS is located at something like
/dev/cu.usbserial
6. Make sure that no other programs are accessing the GPS.
7. In UDM
→
Log-continuous
→
GPS
→
Port:, type in that filename. An example would be:
/dev/cu.usbserial
8. Enter the baud rate for the GPS into the Baud: field, in my case I just typed in 115200
GPS and SQM startup procedure
Some computers reassign the communications port at power up or re-connection, so
to ensure that the UDM can recognize both the SQM and the GPS, please follow these steps:
1. Disconnect the SQM and GPS from computer before powering up.
2. Power up the computer.
3. Start up UDM.
4. Connect the SQM and ensure you get a reading.
5. Disable the GPS connectivity from the log continuous tab.
6. Connect the GPS, and under the Log Continuous GPS tab ensure you are getting GPS location data.
7. Carry on from there.
GPS status
Upon succesful parsing of the GPS data, UDM illuminates (with bright green) the associated indicators
(GPRMC, GPGGA, GPGSV). If too much time passes, the indicators fade to black.
The signal strength group shows the signal to noise ratio (SNR) for all visible satellites. The satellite number is displayed
below each signal strength meter.
The location, speed, time, and status information is displayed as it is received.
If the GPS is enabled before logging, then the logfile is forced to ”MOVING” platform mode, and five fields (latitude,
longitude, elevation, speed, number of satellites in view) are appended to each record.
GoTo
A GoTo pointing device accessory can be controlled by UDM for the purpose of pointing the meter to various
parts of the sky and automatically gathering a reading at each position.
The following GoTo devices are currently supported:
•
SynScan V4
•
iOptron 8408
The connection of the GoTo device is made to the serial port. Note; some USB to RS232 serial adapters do not act
properly with UDM. Usually an FTDI addapter should work well.
Select the machine type, port, and baud rate. Ensure that the connected device is actually available on the port you
select. In Windows, you can use the Device manager, In Mac and Linux, you can type
dmesg
on the command line in a
terminal window to see the latest USB device attached.
A script file containing the positions is located in the “Data Directory” which is identified by:
View
→
Directories
→
Data Directory.
On a Mac, you can use Finder to go to “Applications”, then right click on “udm” or “udm.app” then select “Show
contents”. Then you can navigate to Contents
→
Resources to see the location of the *.goto file(s).
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Unihedron SQM-LU-DL-V Operator’s Manual -
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Summary of Contents for SQM-LU-DL-V
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