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Thread: Laser emergency stop over ethernet

  1. #1
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    Default Laser emergency stop over ethernet

    Project FINISHED.

    See my last post for the schematic
    Attached Thumbnails Attached Thumbnails Laser stop.JPG  

    Last edited by mccarrot; 05-23-2009 at 03:07.

  2. #2
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    cant you just cut the power to the QM as well by wiring the DC power thru the switch?
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  3. #3
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    Default

    It seems no matter what design i come up with a PS is always needed
    for emission indicators,interlock indicators,actuators along with a relay/delay or two

  4. #4
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    Default Off the top of my head....

    You may want to talk to Bill and see if you can get the digital data to kill the QM.NET and have it send a packet to it? Maybe a close shutter packet which triggers a relay to kill? You could sniff the ethernet traffic using "wireshark" and then reproduce the packets but that really complicates things... Sorry if I am off track!

    -Adam
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    Laser (the acronym derived from Light Amplification by Stimulated Emissions of Radiation) is a spectacular manifestation of this process. It is a source which emits a kind of light of unrivaled purity and intensity not found in any of the previously known sources of radiation. - Lasers & Non-Linear Optics, B.B. Laud.

  5. #5
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    Quote Originally Posted by mccarrot View Post
    The only way to add such feature is add a seperate PSU for the relais, but I rather do not want jet another box.
    At this point, that is the only way, as the rj45 jack on the qm.net does not allow access to the spare pins.
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  6. #6
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    Quote Originally Posted by sugeek View Post
    You may want to talk to Bill and see if you can get the digital data to kill the QM.NET and have it send a packet to it? Maybe a close shutter packet which triggers a relay to kill? You could sniff the ethernet traffic using "wireshark" and then reproduce the packets but that really complicates things... Sorry if I am off track!

    -Adam
    The whole idea of this is to be completely fail safe.. Sending packets is definitely NOT fail safe!!!
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  7. #7
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    agreed the packet would have to be read and understood to work..

    i was thinking about a seperate DC power loop that would run along the Ethernet cable for the QM..
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  8. #8
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    Quote Originally Posted by dave View Post
    The whole idea of this is to be completely fail safe.. Sending packets is definitely NOT fail safe!!!
    What you do is, you send a stream of packets which are required to keep the shutter open. If one doesn't arrive when it should, you close the shutter.

    This type of safety system is commonly used in industrial control, and is what I have implemented between my laser and my control booth- if there's no signal positively maintaining communication, it all goes dark, and it does it fast.

    Of course, I also have a current loop kill switch just in case.

  9. #9
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    so i wasn't completely off my rocker...

    if you are sending a stream of packets to keep it open.. what is reading the packets.. or does the QM do that?
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  10. #10
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    Quote Originally Posted by keeperx View Post
    so i wasn't completely off my rocker...

    if you are sending a stream of packets to keep it open.. what is reading the packets.. or does the QM do that?
    I have a micro that does it built into my projector. (I don't have a QM.)

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