As of July 17, 2015, the LabJack forums here at forums.labjack.com are shut down. New registrations, topics, and replies are disabled. All forums are in a read-only state for archive purposes.

Please visit our current forums at labjack.com/forums to view and make new posts. To post on the current forums, use your labjack.com login account. Your old LabJack forums login credentials have been retired. There are no longer separate logins for labjack.com and LabJack forums.

Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

eDO() timing

Started by Jim Wilson , Dec 05 2014 04:01 PM

Please log in to reply

3 replies to this topic

#1 Jim Wilson

Members
4 posts

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!

Back to top

#2 LabJack Support

Admin
8677 posts

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.