I
For the public function codes the possible Exception Response codes and message format are strictly defined by the specification. Within the ModBus specification it is allowed to create User Defined Function Codes within the specified range.
On this basis it would seem appropriate that the Exception Response Codes and message format used in conjuntion with these User Defined Function Codes would also be User Definable without going outside the ModBus specification.
So the question is whether this thinking is correct?
On this basis it would seem appropriate that the Exception Response Codes and message format used in conjuntion with these User Defined Function Codes would also be User Definable without going outside the ModBus specification.
So the question is whether this thinking is correct?