ROC Driver History Info Button
Creates a button that operators may press to access details about the driver's history. This widget will work only with devices that use the ROC Plus protocol..
Sample history for a ROC Plus device.
The ROC driver reads history from tables within the ROC RTU. In the standard ROC protocol, the values in these tables are arranged by RAM Areas, whereas in the ROC Plus protocol they are arranged in History Segments.
Each time that VTScada reads the device's history, it saves the timestamp of the last value read. For the next read, it compares the new timestamp to the stored value. If there is no new information then the tables will not be read again. Each value is read only once.
If you wish to re-read values that have already been read, click the Reset Times button. This causes the next read to re-read the entire history table, not just the most recent information.
The only user-configurable properties for the button widget are the label and the standard Disable Options.
