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Difference between revisions of "Velleman K8062"

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* This unit can control DMX fixtures using a PC and USB interface
+
* This unit can control DMX fixtures using USB interface
 
* Test software and "DMX Light Player" software is included, a DLL is provided to write your own software
 
* Test software and "DMX Light Player" software is included, a DLL is provided to write your own software
 
* Furthermore there is a stand-alone test function that outputs all 512 channels at a time, with adjustable levels
 
* Furthermore there is a stand-alone test function that outputs all 512 channels at a time, with adjustable levels
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This is actually a very poor interface and not recommended. See http://forum.velleman.be/viewtopic.php?f=15&t=2018&hilit=vm116. Due to the pic only processing 8 bytes of information at a time, the frame rates for a full non-0 universe of dmx data is around 1.6 per second.
+
This is actually a very poor interface and not recommended. The design of the K8062 means that it can only transfer 8 bytes of data every 10ms over the USB port, leading to a max frame rate of 1.6 full DMX frames / second. The Velleman USB protocol uses a simple form of compression which results in frames having a large number of 0 byte channels being sent faster.  
  
 +
If this number of channels used is kept small this limitation is unlikely to be noticed. Users that want to use a large number of channels at full rate are encouraged to apply the third party upgrade or switch to another interface.
  
The [[Velleman K8062 Upgrade]] describes a modification to the K8062 that enables it to handle full frame rate DMX.
+
The [[Velleman K8062 Upgrade]] describes the limitations of the original design and explains a modification to the K8062 which enables it to handle full frame rate DMX.
 
 
 
 
<del>There is now a much better work in development.  Please see http://k8062forlinux.sourceforge.net/doc.php.  There's a daemon-like program that works as a driver.  There's still more work to be done on it, and some tweaking seems necessary in places in the code, but it's well documented and has worked very well for me.</del>
 
 
 
The above statement is false. If you take the code mentioned above and insert timing information it takes ~800ms to write 512 bytes of non-0 DMX data:
 
 
 
<pre>
 
usec: 7988  // 8ms for 6 channels
 
max chan is 6
 
 
 
usec: 159958  // 160ms for 100 channels
 
max chan is 100
 
 
 
usec: 759857 // 760ms for 512 channels
 
max chan is 512
 
</pre>
 
 
 
It may be possible to pipeline the data, I'll try this sometime.
 
  
 
Supported under Linux and Mac with the [[Open Lighting Architecture]]
 
Supported under Linux and Mac with the [[Open Lighting Architecture]]
  
 
[[Category:USB]]
 
[[Category:USB]]

Revision as of 08:49, 18 May 2011

Link: http://www.velleman.be/ot/en/product/view/?id=353412
Made by: Velleman
{{ #if: | Free! }}{{ #if: yes | Windows Support }}{{ #if: yes | Linux Support }}{{ #if: yes | Mac OS X Support }}{{ #if: yes | Sends DMX }}{{ #if: | Receives DMX }}{{ #if: | RDM Support }}{{ #if: | MIDI Support }}{{ #if: | HTTP Support }}

K8062.jpg


  • This unit can control DMX fixtures using USB interface
  • Test software and "DMX Light Player" software is included, a DLL is provided to write your own software
  • Furthermore there is a stand-alone test function that outputs all 512 channels at a time, with adjustable levels
  • Kit includes:
    • nice enclosure
    • USB cable
    • CD with: test software, DLL for own developments, free DMX light player


This is actually a very poor interface and not recommended. The design of the K8062 means that it can only transfer 8 bytes of data every 10ms over the USB port, leading to a max frame rate of 1.6 full DMX frames / second. The Velleman USB protocol uses a simple form of compression which results in frames having a large number of 0 byte channels being sent faster.

If this number of channels used is kept small this limitation is unlikely to be noticed. Users that want to use a large number of channels at full rate are encouraged to apply the third party upgrade or switch to another interface.

The Velleman K8062 Upgrade describes the limitations of the original design and explains a modification to the K8062 which enables it to handle full frame rate DMX.

Supported under Linux and Mac with the Open Lighting Architecture