ArchestrA Data Conversion

A key part of OI Gateway’s protocol conversion capabilities 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, OI Gateway does no clamping on the value. OI Gateway passes the client request to the server.

• All pokes greater than 499 characters return Uncertain quality in the client and SMC. 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.

The following sections describe the data conversion mapping scheme applied by OI Gateway.