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

v1.5.0.rc3

• 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

Pymodbus v1.5.0rc2

• 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 struct errors while decoding stray response
• Change test runner from nosetest to pytest
• Fix Misc examples

Pymodbus 1.5.0 Pre release

• 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)

• Fix Misc examples

• Source dist (tar.gz) is now available in PyPI as well.

v1.4.0

• Bug fix Modbus TCP client reading incomplete data
• Check for slave unit id before processing the request for serial clients
• Bug fix serial servers with Modbus Binary Framer
• Bug fix header size for ModbusBinaryFramer
• Bug fix payload decoder with endian Little
• Payload builder and decoder can now deal with the wordorder as well of 32/64 bit data.
• Support Database slave contexts (SqlStore and RedisStore)
• Custom handlers could be passed to Modbus TCP servers
• Asynchronous Server could now be stopped when running on a seperate thread (StopServer)
• Signal handlers on Asyncronous servers are now handled based on current thread
• Registers in Database datastore could now be read from remote clients
• Fix examples in contrib (message_parser.py/message_generator.py/remote_server_context)
• Add new example for SqlStore and RedisStore (db store slave context)
• Fix minor comaptibility issues with utilities.
• Update test requirements
• Update/Add new unit tests
• Move twisted requirements to extra so that it is not installed by default on pymodbus installtion