nielsbasjes opened a new pull request, #721:
URL: https://github.com/apache/plc4x/pull/721

   When requesting too many registers in a single modbus request the request 
will fail with a very unclear modbus error from the actual device at hand.
   
   The modbus specification 
([pdf](https://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf)) 
documents limits of at most 125 registers or 2000 coils in a single request 
which matches with the limits I have observed in the modbus enabled appliance I 
have here.
   
   This change will simply let the application fail before making the 
connection instead of the actual device returning a very unclear modbus error.
   


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