Recent content by paulchernoch

  1. paulchernoch

    Do MODBUS TCP responses have a TCP header like the requests?

    I revisited the version of the MODBUS spec I have - it is different from yours and the sections are numbered differently, less detailed and does not indicate that the response has a header. I will look at your spec.
  2. paulchernoch

    Do MODBUS TCP responses have a TCP header like the requests?

    Is it adequate that the response's MBAP header be identical to the request header (apart from the length)? Or are there specifics to the slave that must be part of the header?
  3. paulchernoch

    Do MODBUS TCP responses have a TCP header like the requests?

    I am coding a MODBUS TCP Windows service in Python. When I use MODSCAN64 to communicate with my Windows Service, all looks good on the service side, but MODSCAN reports a Timeout error. My hypothesis is that my response requires more information, hence MODSCAN is left waiting. The MODBUS spec...
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