Multiplexer communication.

[neevedit]

Hello

I have been given thermocouple amplifiers and 8 channel multiplexer (datasheets attached) so as to measure temperature. I have USB 6211. But I do not have any idea how to proceed with it. Moreover the circuit setup for the amplifier and multiplexer have come from other company which I have attached here. Hence please help me out.

[GerdW]

Hi neevedit,

the 4051 needs a 3-bit coded address to select the channel and a low-active Enable input. So you need 4 DOs to select the active channel (or just 3 DOs when you set /EN to low all the time...).

The MAX31855 talks to an µC using a SPI interface. I don't think you will be able to communicate with that IC using your USB6211 as it is very limited and you already use it's 4 DOs to drive the 4051 multiplexer…

[neevedit]

Hi,

Thanks GerdW for the reply. Bit I have other devices too. Like PCI 6025e with much DI/DO ports. So hence is it possible to communicted with these devices. And how to proceed if possible.

[GerdW]

Hi neevedit,

why don't you say so in your first post?

Well atleast you have more than enough DIOs available. You can search on NI's website and in this forum for "SPI", there are AppNotes and example VIs to be found…