Sequence of Tags in a browse or subscription from client

Hi ,
When an OPC Client browses or subscribes to all tags under a folder, in what sequence to tags are sent to client? In my case the sequence isn’t same as it appears on OPC Browser in Server.

Any idea? Does OPC Spec mandate maintenance of the same sequence in which they were added in the server?


No, there’s no ordering defined in either browsing or subscribing. It’s up to the server.

In practice, a server will generally return a consistent browse order, but subscription data arrives as it becomes available from the data source, so you should never expect any order to it.

So basically its due to asynchronicity.
Thanks for the clarity.