HP/Agilent 33120A Single Pulse Using Burst

Hello,
I am trying to trigger an on demand pulse from an HP 33120A function generator.
The pulse has to be a single, 0-5V ramp with adjustable frequency/period. I was able to get as much from the FG by using Burst and manually triggering off the front panel. Now I would like to get the same functionality from a LabVIEW VI.
While there is a driver for the device, the burst function is, unfortunately, not applicable to the model I am using. I found a similar issue on the forums and followed the SCPI code provided in the answer with some of my own midification (http://forums.ni.com/t5/LabVIEW/33120A-Pulse-Mode/td-p/1088106).
Unfortunately, my VI is not producing the same waveform as the manual triggering off the front panel. It hovers at the offset value and gives me a few square waves down to zero when I run the VI. The square waves are oddly spaced and I usually see 4-5 even though I specified 1 cycle in the VI. Reading through the 33120A, I get the impression that the issue is my not turning off the previous waveform but, if that's the case, I can't figure out how I would do that.
I am starting to move away from only using drivers and into modifying SCPI code but I am still quite new to this. Would really appreciate some advice on what the problem could be. I modified my original VI twice; once to configure only the burst with the FG wave parameters set manually and once to just set up the waveform with no burst. The former did not give me much better results and the latter works fine so I'm back to thinking the issue is in the transition.
I am attaching the initial VI (b) with the two modifications just in case (c, d).
Hope to hear from you,
Yusif Nurizade
Edit: Burst string should say TRIG: SOUR BUS instead of EXT although neither works.
Solved!
Go to Solution.
Attachments:
Init_Burst_3_19b_2014.vi ‏17 KB
Init_Burst_3_19c_2014_Local_Ramp_Rmt_Burst.vi ‏16 KB
Init_Burst_3_19d_2014_Set_Wave_Form.vi ‏16 KB

Sorry for the later reply fellas; I've been in contact with Agilent trying to figure out a fix.
To address some suggestions;
Albert, I've been in touch with Agilent. They've reproduced my SCPI commands on their end with their software (VEE) and got the desired output. I thought that maybe the issue was with the commands I was sending via LabVIEW so I downloaded a trial of VEE and sent the same commands that worked for Agilent. With VEE I have the same problem; some of the commands, relating to frequency, shape and amplitude are processed correctly, while the burst commands are not.
I suggested the firmware issue to them and they agree it might be what's causing the problem. Unfortunately, the device is no longer supported and it would be difficult, if at all possible, to get the update especially considering this is a time sensitive project.
Karl, I've run NI I/O Trace on both the .vi and VEE. The commands seem to be going over without issue. I am led to believe that the issue is with the instrument since Agilent was able to get the desired result using my exact commands and I can't reproduce the same using their software.
I must confess I am a bit confused as to how this could be a firmware issue if some of the commands are going through and the whole thing works if I program manually off the front panel.
Please advise,
Yusif Nurizade

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