Runtime diagnostics and error reporting

For each data source connection, Gateway Communication Driver provides a read-only string item to each connected client called:

$SYS$GatewayConnectionStatusString

To each client, this item functions like other items, just under the topic or device group level. It indicates whether the Gateway Communication Driver has established a successful connection to the configured data source and topic (if any) as follows:

• Connected

• Disconnected

Another item, called $SYS$GatewayConnectionStatus, is a Boolean that reads True when connected and False when disconnected.

• In the case of a DDE/SuiteLink data source, the connection is to an application and a topic.

• In the case of an ArchestrA data source, the connection is to a Platform through Message Exchange.

• In the case of an OPC data source, the connection is to an OPC Server through COM/DCOM object creation.