ArchestrA data conversion

A key part of protocol conversion capabilities of the Gateway Communication Driver is its data type conversion between DDE, SuiteLink, OPC, and ArchestrA Message Exchange sources and clients. Each protocol has a set of supported data types for the values that can be accessed.

• If a client pokes an out-of-range value for any data type, Gateway Communication Driver does no clamping on the value, and passes the client request to the server.

• All pokes greater than 499 characters return Uncertain quality in the client and OCMC. The value is successfully poked to ArchestrA but it is truncated to 499 characters on the read-back. Additionally, all data below +/-1.5e-45 is rounded to 0.0.

  Note: Since InTouch communicates through DDE or SuiteLink protocols, its data type conversions are covered in the sections that address DDE and SuiteLink conversion.