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| Screen Grabs on TDS series scope over GPIB? |
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| rx8pilot:
--- Quote from: alex.forencich on February 23, 2015, 08:01:46 am ---I think the plotter emulator is not what you need. I believe the TDS scopes have a hardcopy command of some sort that will return the image in BMP format directly. Just capture the output of the command and save it to a file and you should be good to go. --- End quote --- Yes, the TDS does have a BMP option. I am not sure how to capture the returned data from the command. So far, I have only managed to communicate in a terminal which would be kinda clumsy for capturing many screens if the terminal would even capture the BMP data. I am not strong in Python and was hoping and dreaming of a done and proven utility so I don't have to spend a couple of days hacking through it. One of the nice things about the plotter emulator was that it would listen for me to initiate a HARDCOPY from the scope and save it the chosen folder. Or, I could initiate from the PC side as well. I was at least hoping for that to work like that. |
| alex.forencich:
The plotter emulator is primarily for use with old HP test equipment that works with HP plotters, so I'm not sure if it's the right tool for the job. Anyway, the Galvant device is not a standard GPIB to USB cable, it's really a GPIB to RS232 to USB cable (same as the Prologix cable, I believe with a compatible command set as well), so it shows up as a serial port. It's not terribly difficult to open up a serial port in your programming language of choice and read and write data. |
| AlfBaz:
So I installed it on my PC and everything worked ok. However it mashed my NI drivers but not the agilent ones. Uninstalling left NI in an unusable state, way to go TEK you FW's. Luckily windows restore fixed it. You may have to go the programmatic route as a brief read up on the Galvant unit seems to indicate a GPIB to virtual com port device. You may be able to use it with 1 instrument only if you select the virtual com port it uses, which means you'll be addressing it as an ASRLx: device rather than GPIBx: device I assume that visa won't recognise a serial device as multi drop thereby it will only treat it as one instrument |
| rx8pilot:
Sorry to here the test caused trouble, the effort is appreciated. It appears that I should consider a different GPIB interface. The Galvant was an experiment. If it cannot allow chaining of many instruments, I will move on to a more supported way of getting connected. I have plenty of PCs with available PCI slots for a proper GPIB card. Do you think that will simplify the learning curve? In the short term, I am still hoping that I can figure out how to get a screen capture from the GPIB to serial interface I already have. Totally shocked that it is such a mysterious challenge. |
| alex.forencich:
My recommended cables are either an Agilent or Beiming GPIB to USB cable or an Agilent, HP, or ICS GPIB to Ethernet box. These will work with all of the standard drivers. |
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