LM92 I2C temperature sensor with NI-8451

Hello !
I try to communicate with a LM92 temperature sensor via the NI USB-8451 by I²C protocol. I have an issue with the addressing because the 7 bits sensor address is 1001011 (A1 and A0 set to 1) but the LM92 is working in little endian (LSB first) and Labview adds the R/W bit at the end of the address so the complete frame sent to the LM92 is 1001011R/W.
I'm trying to find a solution to invert the complete frame before seending it in order to communicate with the LM92.
Labview returns the error -301742 because the address is not the wright one and i can't find how to send the adress in little endian.
I just need to read the temperature register of the sensor so i don't need to write anything in it.
Does anyone have an answer ?
Solved!
Go to Solution.
Attachments:
LM92CIM.pdf ‏773 KB
Temperature read.vi ‏17 KB

Sanguigui wrote:
Hello !
I try to communicate with a LM92 temperature sensor via the NI USB-8451 by I²C protocol. I have an issue with the addressing because the 7 bits sensor address is 1001011 (A1 and A0 set to 1) but the LM92 is working in little endian (LSB first) and Labview adds the R/W bit at the end of the address so the complete frame sent to the LM92 is 1001011R/W.
I'm trying to find a solution to invert the complete frame before seending it in order to communicate with the LM92.
Labview returns the error -301742 because the address is not the wright one and i can't find how to send the adress in little endian.
I just need to read the temperature register of the sensor so i don't need to write anything in it.
Does anyone have an answer ?
I do not have the USB-8451 to check this myself, but based off of this document: http://www.ni.com/white-paper/5767/en/ I would guess you should be looking into these two VIs:
Advanced LabVIEW API for Device Addressing
Use the Script Address + Write or + Read Functions after a Script Issue Start function to program the device address.
Note: This, however, is just a shot in the dark. It seems like deep down they are calling a library, so it may be out of your control unless you have access to the library being called as well.
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