USB 6009 Up/Down Counters

[Liga]

Hello to everybody,

I'm going to buy a USB 6009 for a low cost application and it fits my requirements except the counter.

In fact, I would need an Up/Down counter while USB 6009 has an event counter type only.

Do you know whether is possible to create the count direction by using one of the DIO bit?

I have been thinking to design an external circuit for creating the right signal but I have no idea for a while.

Please, let me know any suggestion.

Thanks in advance.

Regards 

[MarcoL]

Hi,

These device can be used only for simple event counting using PFI 0 as an event counter input. The counter gate is not accessible on the USB 6008/6009 devices.

No Quadrature Encoder Capability is available: USB-6009 has counter. However, in DAQmx Base, externally controlled count direction is not supported. Notice that for a CI input task in the NI-DAQmx Base configuration utility, you can only specify count up. You cannot select "externally controlled." or "Count Down".

I hope it helps,

Marco