Pymodbus v2.2.0rc1

Version 2.2.0

NOTE: Supports python 3.7, async client is now moved to pymodbus/client/asychronous

from pymodbus.client.asynchronous import AsyncModbusTCPClient as ModbusClient

• Support Python 3.7
• Fix AttributeError when setting interCharTimeout for serial clients.
• Provide an option to disable inter char timeouts with Modbus RTU.
• Add support to register custom requests in clients and server instances.
• Fix read timeout calculation in ModbusTCP.
• Fix SQLDbcontext always returning InvalidAddress error.
• Fix SQLDbcontext update failure
• Fix Binary payload example for endianess.
• Fix tornado async serial client TypeError while processing incoming packet.
• Fix asyncio examples.
• Minor update in factory.py, now server logs prints received request instead of only function code

# Now
DEBUG:pymodbus.factory:Factory Request[ReadInputRegistersRequest: 4]
# Before
DEBUG:pymodbus.factory:Factory Request[4]

v2.1.0

• Fix Issues with Serial client where in partial data was read when the response size is unknown.
• Fix Infinite sleep loop in RTU Framer.
• Add pygments as extra requirement for repl.
• Add support to modify modbus client attributes via repl.
• Update modbus repl documentation.
• More verbose logs for repl.

v2.0.1

Version 2.0.1

• Fix unicode decoder error with BinaryPayloadDecoder in some platforms
• Avoid unnecessary import of deprecated modules with dependencies on twisted

v2.0.0

Version 2.0.0

Note This is a Major release and might affect your existing Async client implementation. Refer examples on how to use the latest async clients.

• Async client implementation based on Tornado, Twisted and asyncio with backward compatibility support for twisted client.
• Allow reusing existing[running] asyncio loop when creating async client based on asyncio.
• Allow reusing address for Modbus TCP sync server.
• Add support to install tornado as extra requirement while installing pymodbus.
• Support Pymodbus REPL
• Add support to python 3.7.
• Bug fix and enhancements in examples.

v2.0.0rc2

Note This is a Major release and might affect your existing Async client implementation. Refer examples on how to use the latest async clients.

• Async client implementation based on Tornado, Twisted and asyncio with backward compatibility support for twisted client.
• Allow reusing existing[running] asyncio loop when creating async client based on asyncio.
• Allow reusing address for Modbus TCP sync server.
• Add support to install tornado as extra requirement while installing pymodbus.
• Support Pymodbus REPL
• Add support to python 3.7.
• Bug fix and enhancements in examples.

Pymodbus Patch

Temporary fix to #307 . Use this patch only if you are having a device which is slow in responding to ReadDeviceInformationRequest/ReportSlaveIdRequest/Any diagnostic requests.

Not a foolproof solution

PyModbus v1.5.2

Version 1.5.2

• Fix serial client is_socket_open method

Version 1.5.1

• Fix device information selectors

• Fixed behaviour of the MEI device information command as a server when an invalid object_id is provided by an external client.

• Add support for repeated MEI device information Object IDs (client/server)

• Added support for encoding device information when it requires more than one PDU to pack.

• Added REPR statements for all syncchronous clients

• Added isError method to exceptions, Any response received can be tested for success before proceeding.

  res = client.read_holding_registers(...)
  if not res.isError():
      # proceed
  else:
      # handle error or raise
  

• Add examples for MEI read device information request

Version 1.5.0

• Improve transaction speeds for sync clients (RTU/ASCII), now retry on empty happens only when retry_on_empty kwarg is passed to client during intialization

client = Client(..., retry_on_empty=True)

• Fix tcp servers (sync/async) not processing requests with transaction id > 255
• Introduce new api to check if the received response is an error or not (response.isError())
• Move timing logic to framers so that irrespective of client, correct timing logics are followed.
• Move framers from transaction.py to respective modules
• Fix modbus payload builder and decoder
• Async servers can now have an option to defer reactor.run() when using Start<Tcp/Serial/Udo>Server(...,defer_reactor_run=True)
• Fix UDP client issue while handling MEI messages (ReadDeviceInformationRequest)
• Add expected response lengths for WriteMultipleCoilRequest and WriteMultipleRegisterRequest
• Fix _rtu_byte_count_pos for GetCommEventLogResponse
• Add support for repeated MEI device information Object IDs
• Fix struct errors while decoding stray response
• Modbus read retries works only when empty/no message is received
• Change test runner from nosetest to pytest
• Fix Misc examples

v2.0.0rc1

Version 2.0.0rc1

Note This is a Major release and might affect your existing Async client implementation. Refer examples on how to use the latest async clients.

• Async client implementation based on Tornado, Twisted and asyncio

PyModbus v1.5.1

Version 1.5.1

• Fix device information selectors

• Fixed behaviour of the MEI device information command as a server when an invalid object_id is provided by an external client.

• Add support for repeated MEI device information Object IDs (client/server)

• Added support for encoding device information when it requires more than one PDU to pack.

• Added REPR statements for all syncchronous clients

• Added isError method to exceptions, Any response received can be tested for success before proceeding.

  res = client.read_holding_registers(...)
  if not res.isError():
      # proceed
  else:
      # handle error or raise
  

• Add examples for MEI read device information request

PyModbus 1.5.0

• Improve transaction speeds for sync clients (RTU/ASCII), now retry on empty happens only when retry_on_empty kwarg is passed to client during intialization

client = Client(..., retry_on_empty=True)

• Fix tcp servers (sync/async) not processing requests with transaction id > 255
• Introduce new api to check if the received response is an error or not (response.isError())
• Move timing logic to framers so that irrespective of client, correct timing logics are followed.
• Move framers from transaction.py to respective modules
• Fix modbus payload builder and decoder
• Async servers can now have an option to defer reactor.run() when using Start<Tcp/Serial/Udo>Server(...,defer_reactor_run=True)
• Fix UDP client issue while handling MEI messages (ReadDeviceInformationRequest)
• Add expected response lengths for WriteMultipleCoilRequest and WriteMultipleRegisterRequest
• Fix _rtu_byte_count_pos for GetCommEventLogResponse
• Add support for repeated MEI device information Object IDs
• Fix struct errors while decoding stray response
• Modbus read retries works only when empty/no message is received
• Change test runner from nosetest to pytest
• Fix Misc examples