How to connect Trigger USB-6009 on a flowmeter

[estein]

I have a flowmeter with the data:

sensing principle: hall-effect, non contacting

output square wave: NPN o.c.

Voltage supply: 4,5-24 VDC

output current: 13mA max

more you can find in the attachement and i use the USB-6009.

How i have to connect the flowmeter to the trigger (PFI0)?

Thanks in advance for any help!

E.Stein

[HoussamK]

Hi

The USB-6009 does not support using an external clock. The PFI0 line on the device is actually meant to be used as either a digital trigger for your tasks, or a counter input for event counting (the 6009 manual mentions this on page 15: http://www.ni.com/pdf/manuals/371303l.pdf). You will notice in our LabVIEW shipping examples, all of the External Clock examples don't list the 6008 or 6009 as supported devices.

[estein]

Hi,

thanks for help. I want to use the PFI0 as a counter input for event counting.

To count the signals of the flowmeter.

[HoussamK]

Hi

are you working with LabVIEW? What is the version you´re working with?

The active edges of  the source signal increment the value of the count register. You can configure PFI 0 as a source. In this mode, falling-edge events are counted using a 32-bit counter. The gate and out are not used for simple edge counting.

The Count Digital Events examples in LabVIEW (Help>>Find Examples...Hardware Input and Output>>DAQmx>>Counter Measurements)  should give you a good starting point.

The USB-6008/9 only works with falling edge counting. Simply change the type of edge to falling and your task will work properly.

[estein]

Thanks for Info!

I work with LabVIEW 8.6 and the configure and programming  of

falling-edge events is not the problem.

The Problem is the connection. How to connect the flowmeter to the

USB-6009? Because the 6009 have no gate and out.

[Dennis_Knutson]

Read what was said - "The gate and out are not used for simple edge counting."