How do I use OPC to access net weights in my HI 3000 series unit?

OPC requires an OPC driver.   You should be able to use any approved OPC driver program.  Once you get the driver set up on your system you should receive data registers from your HI 3000 unit (which include the HI 3010, HI 3030, HI 3300, and HI 3600). There is an example of setting up the OPC driver in our HI 3000 Series Operation and Installation manual available online at www.hardysolutions.com. Go to the products page for the unit you wish to download the manual for.

Once you have the link made you would need to "map" the desired data into the Hardy Control-Link output table within the unit. This will place the desired data into the output registers. There is an example of this "mapping" in the HI 3000 Series Operation and Installation manual, as well as several questions/answers about mapping in this knowledge base.