Multiple Inputs

[34523]

Hi Everyone,

I am to labview and is desperately in need of some help. I have a multiplexer which is connected to 4 samples to be tested and will read certain data (temperature, frequency and voltage) from a single sample at any one time. I have already constructed the VI for the case of one single sample. How do I modify to incorporate the multiplexer and have a selection button which will allow me to select which (of the 4) sample to obtain output from? I want to be able to choose which sample to acquire data from, at any point of time. All help is much appreciated! Thank you!

[Dennis_Knutson]

How do you physically control the mux? That's an essential piece of information you have not provided? Is it with digital lines from your DAQ board?

[34523]

Hi,

The multiplexer will be connected to a multiplexer evaluation board and I hope to be able to control it using the labview interface? However I am not sure how to go about doing it.I hope you understand what I mean. Thanks!

[Dennis_Knutson]

That does not help at all. What is this "multiplexer evaluation board" and do you have a LabVIEW driver for it? If not, what sort of api is provided by the vendor for communicating to it? DLL, ActiveX, .NET? It's all in the details and you have provided very few.

[34523]

Sorry for all the vagueness and confusion, the Multiplexer Evaluation Board (National Semiconductor LMH 730276) along with the Multiplexer (National Semiconductor LMH 6574) will be connected to my computer via a Connector Block for DAQ Devices (NI SCB-68) and a DAQ Board (NI PCI-6251). The four samples that I will be testing are connected to the Multiplexer Evaluation Board and I would like to know how to edit my VI to enable me to control the multiplexer. Thank you!

[Dennis_Knutson]

That makes even less sense. The 6251 has it's own mux with 16 inputs. Why you want to use an external mux is a mystery but if you insist, just wire two of the digital outputs of the 6251 to your mux's select lines.