How do I make labview read sensor data from multiplexer channel

[alicei]

Hi, 

I have a NI8541 ( I2C interface )  and I am trying to use a multiplexer ( PCA9548A ) to be able to control multiple sensors ( HTU21DF ) through one NI8541. To do this I need to send the address of the multiplexer, then the channel within the multiplexer, and then the address of the sensor within that channel.

I have been unable to successfully change the address from the multiplexer address of 70 to the sensor address of 40 in labview . Here is a simple diagram of my setup since this is a bit hard to explain: 

 I have tried to use both the general I2C basic commands as well as the script i2c commands but in both I am unable to figure out how to read/write to the sensor.

Any help or advice would be greatly appreciated !!!! 

[santo_13]

Please do not create duplicate posts - https://forums.ni.com/t5/LabVIEW/Using-PCA9548A-multiplexer-with-NI8451-I2C-interface-device-to/m-p/...