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How to trigger Lightcrafter 6500 with external signal ?

Grzegorz Finke
Prodigy 65 points


Hi,

I have a problem with triggering my Lightcrafter 6500 with external signal. According to the manual I should choose one of the voltage values, i.e. 1.8 or 3.3 V with jumper J21 and apply one of them to J20 connector, which has two inputs. While trigger input 2 is high, trigger input 1 should advance the pattern sequence to the next pattern in the sequence on every pulse. For my needs I have chosen 1.8 V as a high state and applied it on the input 2 of J20 connector. On the input 1 I apply pulses of 1.8 V.

The thing is that when I connect my triggering device with J20 connector (with or without voltage applied, it does not matter) I receive "Sequencer Abort Status Flag Error" and "Sequencer Running" marked in Status field, and cannot upload anything to LUT or stop the sequence, no images are displayed. I checked Pre-stored Pattern Mode and Pattern On-The-Fly Mode. When I disconnect the triggering device from the J20 connector, everything works fine.

So what can I do wrong ? I will be grateful for any tips.

Regards,

Grzegorz

  • 0
    TI__Mastermind 30600 points
    Grzegorz,

    Sorry you're having trouble with triggering. Just so I'm clear on the issue - when you insert a connector into J20, the device gives you the errors, regardless of whether voltage is being applied? Sounds like you might be shorting out the pins on J20. What method are you using to connect to J20?

    Thanks,
    Paul
  • 0 in reply to Paul Goedeke
    Prodigy 65 points

    Hi Paul,

    You understand my problem correctly. To connect to J20 port I use Molex connector, part number: 51021-0600, as suggested in the manual. I have 4 wires attached to the connector that go to pins: 1 and 2, 3 and 4. Ground pins remain free as I have no ground output in my device.

    However, there might be a short circuit problem as thought it through. I wanted to control triggering of DMD with one device, which has two TTL outputs (BNC jacks).  When I checked them it appeared that -V are coupled, which may cause the short circuit. I will try to use separate power source for each triggering signal and let you know if it helped.

    Regards,

    Grzegorz

  • 0 in reply to Grzegorz Finke
    Prodigy 65 points
    Separate power source solved the problem (pins were shorted out). Thank you Paul for your help.

    Regards,
    Grzegorz
  • 0 in reply to Grzegorz Finke
    TI__Mastermind 30600 points
    Glad it got fixed!

    Paul