PROFIBUS Manual

SRD: Send and Request Data

SRD: Send and Request Data

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SRD: Send and Request Data

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SRD is a service whereby data is sent to a passive responder at the same time as a request for data. The responder can then transmit the data directly in its response. To allow immediate transmission of this response, the responder must have this data ready in advance. It is not therefore absolutely necessary for there to be any relationship between the contents of sent and received data. The SRD service can be used to request data while sending transmitted data in the form of a zero element (blank message).

 

SRD: Send and Request Data

SRD: Send and Request Data

 

The service confirmation (con) can therefore contain data from the responder.