User`s guide

OPC Client Sample Program • 27
Step 8. To perform asynchronous read, click Read button. The server
will read value from corresponding hardware for each item.
The value and other parameters returned will be presented in
the Items in Current Group list.
Step 9. To perform synchronous write, you should first set a value to a
writable item. To do this, you can right-click on an item with
“W” or “R/W” access right. And a dialog box will appear for you
to enter the item value. And then click the Write button, the
value you specified will write to the hardware.