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SML (Smart Message Language) is a communication protocol for applications in the area of data acquisition and parametrisation of devices. User data are packed into SML-messages, which are again combined to SML files for transmission. SML-files are independent of the transmission method. They can be sent via e-mail, modem-connection or IP-Telemetry.

The following SML-files can occur: SML-request file, SML-response file or SML-combined file.

An SML-message is either a request message or a response message. Depending on the task, SML defines different message types.