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The existing versions of LIFA and LINX are not compatible with the Arduino sketch supplied by Atlas scientific. The Atlas Scientific sketch uses a second serial port on an Arduino Uno. There is no support in LIFA or LINX to write to or read from a second Arduino serial port. If you need to use Labview use the Continuous Serial Write and Read VI that comes with Laview to communicate with the Arduino sketch supplied by Atlas Scientific.
However, before using Labview make sure you can use the Arduino IDE serial monitor and the Atlas Scientific sketch to read valid data from a PH sensor.