# multiple channel digital output, USB-1024LS

**URL:** <https://psychtoolbox.discourse.group/t/multiple-channel-digital-output-usb-1024ls/1767>\
**Category:** Uncategorized\
**Created:** [May 20, 2008, 10:06pm UTC](https://psychtoolbox.discourse.group/t/multiple-channel-digital-output-usb-1024ls/1767 "2008-05-20T22:06:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [May 20, 2008, 10:06pm UTC](https://psychtoolbox.discourse.group/t/multiple-channel-digital-output-usb-1024ls/1767/1 "2008-05-20T22:06:12Z")

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Hi  
  
I want to control 32 relays. I am thinking about using Measurement computing's USB 1024LS.   
It has 24 bit digital i/o and cheaper than USB 1208LS. Has anybody used USB-1024LS with   
Psychophysics toolbox? It looks Daq toolbox needs some modification. I want to know how   
extensive modification it need to make the 1024LS to work. I would appreciate any   
information.  
  
Thanks,  
  
Hiroto

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**Author:** ![mpantzer1993](https://avatars.discourse-cdn.com/v4/letter/m/b2d939/32.png) [@mpantzer1993](https://psychtoolbox.discourse.group/u/mpantzer1993)\
**Post date:** [May 21, 2008, 9:31pm UTC](https://psychtoolbox.discourse.group/t/multiple-channel-digital-output-usb-1024ls/1767/2 "2008-05-21T21:31:22Z")

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Mario wrote about MCC's 1024LS and the DaqToolbox:  
  

> \> If you have a Mac it looks pretty doable, assuming that the  
> \> low-level HID protocol of the 1024LS is similar to the  
> \> 1208/1408/1608 protocol, and that you don't need too much timing  
> \> resolution.  
> \>   
> \> Best case would be adding 2 lines to  
> \> DaqDeviceIndex.m, so the device is recognized.

I've just glanced at the relevant header and C source files that the  
linux group wrote to talk to MCC devices, and the command codes for  
the 1024LS are completely different from those of the 1208FS. I'm  
afraid Mario was overly optimistic there.  
  

> \> So i guess its worth a try, doable within a day if nothing  
> \> unexpected happens.

I think that's also totally unrealistic. I think the code for the  
1024LS would be so different from that of the 1208/1408/1608FS that  
you'd do just as well to start from scratch...  
  
I could help a little, but I don't have much "free" time at the  
moment. I wouldn't be surprised if it took me a week if I were  
actually writing and testing this code completely myself, and I've  
done this before...  
  
I agree with Mario that it could be done, but I disagree with his  
assessment of how quickly it could be done. Maybe Jeff Mandel will  
chime in with another estimate as he was the one who flirted with the  
idea of modifying code to run a 1208LS. Presumably that device is  
more similar to the 1208FS than the 1024LS is, but Jeff still opted to  
purchase an FS rather than try to make his LS work with the  
DaqToolbox.  
  
--   
Mickey P. Rowe ([mrowe@...](mailto:mrowe@...))