> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/treiberauswahl/dde_dynamic-data-exchange/dde_advance_f_rsview.md).
# DDE Advance for RsView, ...
DDE for Advance is an event-controlled DDE specified by the Rockwell corporation. It has the same properties as FAST-DDE with the addition of diagnostic functionalities. The ACRON Provider is notified not only about every amendment to measured values but also about communication malfunctions to a variable.
#### Background
The measurement data connection and the pulses for the service module are implemented by way of an event-controlled AdvanceDDE interface. Malfunctions and messages cannot be imported. This is also not necessary, as RSView features its own malfunction database.
#### Measurement data
On any change of a measured value, the ACRON Provider is notified and saves the value - and where appropriate the maximum and minimum - cyclically to the ACRON database.
#### Service variables
In the case of external variables for service, the ACRON Provider is notified of any change by RSView and reacts as follows:
If the value changes from ZERO to a different value, ACRON assumes that the unit has been switched on. If the value changes from not equal to ZERO to ZERO, ACRON assumes that the unit has been switched off.
These events are stored in a binary intermediate file in the ACRON alert path and imported from there by the ACRON Reporter or ACRON Data Transfer as required.
Note
To start the RSView DDE server, it must be enabled in the RSView startup dialog.
#### Syntax of external variable
Full name of the RSView variable (e.g. `system\Second`)
## Driver
### Driver file
Display the name of the selected driver and select a driver from the list of installed drivers
### Version
Version of the driver file
### Interface type
Display the driver interface type
### Data transfer type
Description of the data transfer type
## Driver parameters
### Service
`RTData`:
### Topic
Program name of DDE Server without extension
### Topic
Project name: This is the RSView project name with no path or extension (e.g. Samples).
## Settings
### Polling delay after start
Start of data logging in seconds after the ACRON Provider has successfully established process communication. This is useful, for example, if the opposite party takes some time after a restart to initialize all the variables.
Recommended entry: Depending on project load time about 10-20 seconds
### Always display provider window on top
Provider windows are always displayed on top
### Activate test mode
Display a window with diagnostic messages
On startup the ACRON Provider opens a window with diagnostic messages. The log file is stored under the relevant provider name in the ACRON installation path, in the `Log` directory.
Note
As diagnosis mode heavily influences the performance of the application, and the recorded messages can normally only be evaluated by Technical Support, you should only activate it when prompted to do so by Support.
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