Overload List
| Overload | Description |
|---|---|
| ReadMaxAge(ItemValue[]) | Reads one or more values, qualities and timestamps for the items specified. This is functionally similar to the OPCSyncIO::Read method except it is asynchronous and no source is specified (DEVICE or CACHE). The server will make the determination as whether the information will be obtained from the device or cache. This decision will be based upon the MaxAge parameter. If the information in the cache is within the MaxAge, then the data will be obtained from the cache, otherwise the server must access the device for the requested information. |
| ReadMaxAge(Int32[],Int32[],Int32,Int32,Int32[]) | Asynchronously reads values, qualities and timestamps for the items specified. ( Available only in OPC DA V3 servers ) This method is functionally similar to the OpcGroup.Read method except it is asynchronous and no source is specified (DEVICE or CACHE). The server will make the determination as whether the information will be obtained from the device or cache. This decision will be based upon the MaxAge parameter. If the information in the cache is within the MaxAge, then the data will be obtained from the cache, otherwise the server must access the device for the requested information. |