Inherent nature of access to item
AccessRights represents the server's ability to access a single OPC data item. The property value can be 'read', 'write', or 'read/write'. If AccessRights is 'read', you can read the server item's value. If AccessRights is 'write', you can write values to the server item. If AccessRights is 'read/write', you can read and change the server item's value. If you attempt a read or write operation on an item that does not have the required access rights, the server may return an error.
[ 'read' | 'read/write' | 'write' ]
The value is set by the server when an item is created.