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