OnDemand Encoder Measurement

[ivans]

I'm trying to implement in C# the same configuration I did previously in SignalExpress.

I measure the Counter Angular Position of an encoder in OnDemand Aquisition mode. I use the counter 0 of the card PCI-6232 to accomplish this task.

In SignalExpress it works just fine, but there is no example in C# for that task. The example of C# code that do exists uses external clock and buffering that I don't need nor can't to do because of my card is not supports such behaviour.

Does anybody have that piece of code I need so much?

Thanks in advance

Ivan

[ianidas300]

The commnents in the code specify why an external sample clock is necessary and potential ways around this. The comment is as follows:

Note: An external sample clock must be used. Counters do not
* have an internal sample clock available. You can use the
* Dig Pulse Train-Continuous example to generate a pulse
* train on another counter and connect it to the Sample
* Clock Source you are using in this example.

[ivans]

Thank you for your answer lanidas300.

The problem is my current card does not support such kind of routing. I can't set counter 1 to be external clock for counter 0. When I try to set it I receive error. Besides what I need to do is to read counter OnDemand, I don't need buffering.

Eventually the solution was found.

You have to use Count Digital Events example and replace original channel setting

myTask.CIChannels.CreateCountEdgesChannel(counterComboBox.Text, "Count Edges",
              edgeType, Convert.ToInt64(initialCountTextBox.Text), countDirection);

to settings from Meause Angular Position with Buffered External clock example

myTask.CIChannels.CreateAngularEncoderChannel(counterComboBox.Text,
                    "",encoderType,zIndexEnable,zIndexValue,encoderPhase,pulsePerRev,
                    0.0,CIAngularEncoderUnits.Degrees)

Also don't forget to copy required variables definitions like encoderType, zIndexEnable, zIndexValue, encoderPhase, pulsePerRev.

That's all!