The following tables list the members exposed by SubscribeRequestItemList.
Public Constructors
| Name | Description | |
|---|---|---|
 | SubscribeRequestItemList Constructor |
Public Properties
| Name | Description | |
|---|---|---|
 | Deadband | Specifies the percentage of full engineering unit range of an item??s value that must change prior to being returned in a SubscriptionPolledRefresh response. The deadband value shall be in the range 0-100 percent and only applies to analog (integer or float) types. The deadband will also apply to array types. The entire array is returned if any array element exceeds the deadband threshold. Server default is 0. See the OPC DA Custom Specification for further detail. |
| DeadbandSpecified | If FALSE then the Deadband value is not defined or ignored. |
| EnableBuffering | If True, the client is requesting that the server use the RequestedSamplingRate to check for value changes and save all changes in a buffer for return to the client at the next SubscriptionPolledRefresh request. See the section on Data Management Optimization in this document and OPC DA Custom Specification for further detail. |
| EnableBufferingSpecified | If FALSE then the EnableBuffering value is not defined or ignored. |
| ItemPath | This is a hierarchical parameter. A value specified for an item will override the value on list level. |
| Items | A container tag of the item information that follows. It is expected that there are one or more Items per ItemList. |
| ReqType | This is a hierarchical parameter. A value specified for an item will override the value on list level. |
| RequestedSamplingRate | The client specifies the rate in milliseconds at which the server should check for value changes. If no item-specific sampling rate is specified, sampling will be based on the rate of the item list. See the section on Data Management Optimization in this document and OPC DA Custom Specification for further detail. |
| RequestedSamplingRateSpecified | If FALSE then the RequestedSamplingRate value is not defined or ignored. |