How to read Exceptions from goburrow modbus slave library

[samminen]

Hello, I have both modbus slave and modbus master (implemented in GoLang) but I am not able to figure out how to get below list of exceptions when there a invalid operation read/write.

In modbus slave how to call func GetException(frame Framer) (exception Exception) ? I am calling below function to read holding registers and handling err if any

result, err := client.ReadHoldingRegisters(req.StartAddress, req.Count)

---

client := mb.NewClient(handler.client) result, err := client.ReadHoldingRegisters(req.StartAddress, req.Count) if err != nil { // Added close in since the keep alive will prevent it from ever reconnecting level.Error(logger).Log("err: Modbus TCP Client Unavailable ", err.Error()) handler.client.Close()

				go buildResponseRawData(*handler, req.Type, "", result, err, &req.ResultsChan)
			} else {
				go buildResponseRawData(*handler, req.Type, req.Endian, result, nil, &req.ResultsChan)
			}

---

// Success operation successful. Success Exception // IllegalFunction function code received in the query is not recognized or allowed by slave. IllegalFunction Exception = 1 // IllegalDataAddress data address of some or all the required entities are not allowed or do not exist in slave. IllegalDataAddress Exception = 2 // IllegalDataValue value is not accepted by slave. IllegalDataValue Exception = 3 // SlaveDeviceFailure Unrecoverable error occurred while slave was attempting to perform requested action. SlaveDeviceFailure Exception = 4 // AcknowledgeSlave has accepted request and is processing it, but a long duration of time is required. This response is returned to prevent a timeout error from occurring in the master. Master can next issue a Poll Program Complete message to determine whether processing is completed. AcknowledgeSlave Exception = 5 // SlaveDeviceBusy is engaged in processing a long-duration command. Master should retry later. SlaveDeviceBusy Exception = 6 // NegativeAcknowledge Slave cannot perform the programming functions. Master should request diagnostic or error information from slave. NegativeAcknowledge Exception = 7 // MemoryParityError Slave detected a parity error in memory. Master can retry the request, but service may be required on the slave device. MemoryParityError Exception = 8 // GatewayPathUnavailable Specialized for Modbus gateways. Indicates a misconfigured gateway. GatewayPathUnavailable Exception = 10 // GatewayTargetDeviceFailedtoRespond Specialized for Modbus gateways. Sent when slave fails to respond. GatewayTargetDeviceFailedtoRespond Exception = 11