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Issue Description

I can’t start the client example.

Python 3.7.0 (default, Sep 15 2018, 19:13:07) [GCC 8.2.1 20180831] on linux

[dev@dev-vm modbus]$ python modbus_client.py 
Traceback (most recent call last):
  File "modbus_client.py", line 18, in <module>
    response = tcp.send_message(message, sock)
  File "/usr/lib/python3.7/site-packages/umodbus/client/tcp.py", line 262, in send_message
    raise_for_exception_adu(response_error_adu)
  File "/usr/lib/python3.7/site-packages/umodbus/client/tcp.py", line 247, in raise_for_exception_adu
    pdu_to_function_code_or_raise_error(resp_pdu)
  File "/usr/lib/python3.7/site-packages/umodbus/functions.py", line 111, in pdu_to_function_code_or_raise_error
    raise error_code_to_exception_map[error_code]
umodbus.exceptions.IllegalDataAddressError:  The data address received in de request is not an allowable address for
    the server.

How can I fix it?

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:6

github_iconTop GitHub Comments

1reaction
albcpcommented, Jun 25, 2020

Hi @codevak, the code for the server included in the Readme is wrong, you need to modify function_codes=[3, 4] to function_codes=[1, 2] and function_codes=[6, 16] to function_codes=[5, 15].

0reactions
codevakcommented, Jun 26, 2020

Hi, This works now. Thanks a lot!

Read more comments on GitHub >

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