EXCEPTION_CODE

[Modbus]

Description

The exception code is used for the Modbus Slave node to send back packets so that the Modbus Master can get feedback.

Code

• MODBUS_SUCCESS (0x00)
  － The packet was successfully transferred.
• MODBUS_ILLEGAL_FUNCTION (0x01)
  － The Slave device receives an unallowed function code.
• MODBUS_ILLEGAL_DATA_ADDRESS (0x02)
  － The Slave device receives an unallowed address space.
• MODBUS_ILLEGAL_DATA_VALUE (0x03)
  － The Slave device receives an unallowed value in the specified address space.
• MODBUS_SERVER_DEVICE_FAILURE (0x04)
  － A non-recoverable error occurred during operation.
• MODBUS_ACKNOWLEDGE (0x05)
  － The instruction has been accepted and is being processed, but it will take a long time to complete.
• MODBUS_SERVER_DEVICE_BUSY (0x06)
  － Long command being processed.
• MODBUS_MEMORY_PARITY_ERROR (0x08)
  － Parity error detected when trying to read memory.
• MODBUS_GATEWAY_PATH_UNAVAILABLE (0x0A)
  － Unavailable Modbus Gateway paths.
• MODBUS_GATEWAY_TARGET_DEVICE_FAILED_TO_RESPOND (0x0B)
  － Modbus Gateway devices are not on the network.
• MODBUS_INVALID_SLAVE_ID (0xE0)
  － Invalid Slave Number.
• MODBUS_INVALID_FUNCTION (0xE1)
  － Invalid Function Code.
• MODBUS_RESPONSE_TIMEOUT (0xE2)
  － Replies over time.
• MODBUS_INVALID_CRC (0xE3)
  － Ineffective cyclic redundancy checks.
• MODBUS_ILLEGAL_DATA_MODE (0xE4)
  － Illegal data patterns.
• MODBUS_INVALID_BUS (0xE5)
  － Ineffective access.

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The text of the 86Duino reference is a modification of the Arduino reference and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.