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eDO() timing


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3 replies to this topic

#1 Jim Wilson

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Posted 05 December 2014 - 04:01 PM

How much time typically elapses between a call to eDO() and its return?

 

Is the given digital output guaranteed to be in the specified state when eDO() returns?

 

Thanks!



#2 LabJack Support

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Posted 08 December 2014 - 03:21 PM

The round trip-time is typically about 1 ms (the following shows 0.68 ms for writing all DO):

 

http://labjack.com/s...users-guide/3.1

 

Figure about 0.45ms for the command to get to the U3, 0.1ms of processing time on the U3 (actual is likely much less than that), and about 0.45ms for the response to get back back to the host application.

 

The state is updated before the response is sent back to the host.  If there is no load, the DO will be at the specified state before you get the response back, but if you have a lot of capacitance on the output you could slow it down to where it is still working on changing.



#3 Jim Wilson

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Posted 10 December 2014 - 10:28 AM

Alright. Same for the U6, presumably, given that the bulk of the time is data transmission. Thank you!



#4 LabJack Support

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Posted 10 December 2014 - 11:02 AM

Yes, same for the U6:

 

http://labjack.com/s...users-guide/3.1

 

The T7 & UE9 are also similar (~1ms) for USB & Ethernet.  WiFi on the T7-Pro has a minimum of more like 7ms.




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