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Stream from two Labjacks


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#1 Martin Müllenhaupt

Martin Müllenhaupt
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Posted 29 August 2012 - 12:33 AM

Hi,

the Maximum Data Rates for the LabJack U12 page says

stream mode only works on 1 LabJack at a time (since there is no way to synchronize).


I'm currently successfully streaming the counter value of an U12.
It wouldn't be possible to simultaneously stream anything from another U12?

Since all functions get a Labjack ID, they could distinguish the devices.
Is this problem related to the global streamInfo struct I see in the ljacklm driver?

Does this problem also affect other Labjack devices (U3/U6)?

#2 LabJack Support

LabJack Support
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Posted 29 August 2012 - 09:18 AM

If you are streaming the counter, you can still get 1 analog input and the 4 IO inputs also.

The U12 driver is limited to a single stream. It is possible to stream from 2 U12s at the same time by making a copy of the driver:

https://forums.labja...p?showtopic=279


The UD driver, for the U3/U6/UE9, is not limited to 1 stream, so it can stream from multiple devices at the same time. It does not do any synchronization of the streams, so that is left up to the programmer if needed.

It is possible to get synchronized streams from UE9s by using the external stream trigger feature on that device, but it does require more advanced programming to read the streams properly and handle potential issues properly.

Streams on the U3/U6/UE9 are not limited to 4 channels, so you can get more channels with a single device. In fact, if you use the Mux80 with the U6 or UE9 you can stream lots of channels from a single device.


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