Python API Analog input

That's good to know. Is it possible to use a userspace and read data at microsecond intervals?

We are going to get sensor data then process the data outside of LinuxCNC then feed LinuxCNC commands based on sensor data. I'm not the architect of this project, so I don't know why we're doing it that way. The halcmd method you provided above will work, so now I'm satisfying my own curiosity.

koth442 wrote: That's good to know. Is it possible to use a userspace and read data at microsecond intervals?

No.

Even in the realtime layer the analogue inputs of the Mesa cards only update every 1mS.

The way to do what you want, if you must use Python, is to create a HAL pin in a Python HAL component that is connected to the Mesa analogue output, then process that data.
linuxcnc.org/docs/2.7/html/hal/halmodule.html

Note that anything done in standard Python is not going to be even close to real time
( you may have unpredictable multi-millisecond delays due to memory allocation and garbage collection )

Thanks for the help everyone.