Hi Lei,
I have tried in the past to do this unsuccessfully. LV always truncates the Zeroes on the MSB side and starts with the First "1" encountered from the MSB side. I am assuming here.. that you are using Numeric Indicator Configured to Show Binary Value.
One Work Around is to Use Format into String Function and Use Pad with Zeros to See the truncated Zeroes. But again the Length of the String is fixed based on what you set it to be. Since you know what your data is 8 Bit 16 Bit etc. This is not a Problem.
Here is a small Vi showing this ...
Good Luck
Mache
Good Luck!
Mache