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Update decompose_requests.rst #54

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May 11, 2018
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Update decompose_requests.rst #54

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10 changes: 5 additions & 5 deletions docs/source/decompose_requests.rst
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Original file line number Diff line number Diff line change
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Decompose requests
------------------

A Modbus requests and responses contains a Application Data Unit (ADU) which
contains a Protocol Data Unit (PDU). The ADU is the enveloppe containing a
message, the PDU is the message itself. Modbus requests can be send
communication layers layers, like RTU or TCP/IP. The ADU for these layers
differs. But the PDU, the message, has always the same strcuture, independent
Modbus requests and responses contain an Application Data Unit (ADU) which
contains a Protocol Data Unit (PDU). The ADU is an envelope containing a
message, the PDU is the message itself. Modbus requests can be sent via
two communication layers, RTU or TCP/IP. The ADU for these layers
differs. But the PDU, the message, always has the same strcuture, regardless
of the way it's transported.

PDU
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