8000 How to return a specific slave excpetion? · Issue #207 · NModbus/NModbus · GitHub
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How to return a specific slave excpetion? #207

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Zapnologica opened this issue Mar 29, 2025 · 0 comments
Open

How to return a specific slave excpetion? #207

Zapnologica opened this issue Mar 29, 2025 · 0 comments

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@Zapnologica
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I have the following in my custom ISlaveDatStote:

    public TPoint[] ReadPoints(ushort id, ushort numberOfPoints)
     {
         _logger.LogDebug($"Received request to read registers with Id {id} and number of points {numberOfPoints}");

         // this is the start of the register you are reading from
         if (!_dataPollingService.DataMappings.TryGetValue(id, out var mapping))
         {
             throw new SlaveException($"register {id} does not exist in the mappings file.");                
         }
     }

How can I throw an exception with the specific error response code in modbus? I want to differentiate between invalid address and invalid data value?
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