IDEC WindSRV User Manual
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meet the needs of rare OPC clients. Normally these options will not need to be adjusted for a majority of the OPC client
applications users will encounter. The OPC compliancy dialog appears as shown below.
Descriptions of the parameters are as follows.
Perform the following operations is the master enabling switch for the options present in the list box. When
enabled, the server will set all options to conform to OPC compliancy. This setting is not enabled by default.
When enabled, Reject unsupported Language IDs only allows Language IDs that are natively supported by
the server. If the OPC client application attempts to add an OPC group to the server and receives a general
failure, it is possible the client has given the server a Language ID that is not natively supported. If this occurs,
the server will reject the group addition. To resolve this particular issue, disable the compliant feature to force
the server to accept any Language ID.
When enabled, Ignore dead-band when returning data for cache needs allows the server to ignore the
dead-band setting on OPC groups added to the server. For some OPC clients, passing the correct value for dead-
band causes problems that may result in the OPC client (such as, having good data even though it does not
appear to be updating frequently or at all). This condition is rare. As such, the selection should normally be left in
its default disabled state.
When enabled, Return all browse items regardless of read-write filter causes the server to return all tags
to an OPC client application when a browse request is made, regardless of the access filter applied to the OPC
clients tag browser.
When enabled, Data type support for 2.05a causes the server to adhere to the data type requirements and
expected behaviors for data type coercion that were added to the 2.05a specification.
When enabled, Return synchronous device read failure if one or more items would result in bad quality
causes the server to return a failure if one or more items for a synchronous device Read results in a bad quality
read. Compliance requires the server to return success, indicating that the server could complete the request
even though the data for one or more items may include a bad and/or uncertain quality.
When enabled, Return initial updates for items in a single callback causes the server to return all
outstanding initial item updates in a single callback. When not selected, the server returns initial updates as they
are available (which could result in multiple callbacks).
When enabled, Respect Language ID set by client when performing data type conversions determines
whether the server uses the Locale ID of the running Windows Operating System or the Locale ID set by the OPC
client when performing data type conversions. For example, a string representing a floating point number such as