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umodbus Modbus TCP ServerModbus TCP Client Modbus TCP Client

admin 11月 11, 2020 0 

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import logging
from socketserver import TCPServer
from collections import defaultdict

from umodbus import conf
from umodbus.server.tcp import RequestHandler, get_server
from umodbus.utils import log_to_stream


log_to_stream(level=logging.DEBUG)

# A very simple data store which maps addresses against their values.
data_store = defaultdict(int)

# Enable values to be signed (default is False).
conf.SIGNED_VALUES = True

TCPServer.allow_reuse_address = True
app = get_server(TCPServer, ('localhost', 502), RequestHandler)



def (slave_id, function_code, address):
    """" Return value of address. """
    return data_store[address]


@app.route(slave_ids=[1], function_codes=[5, 15], addresses=list(range(0, 10)))
def write_data_store(slave_id, function_code, address, value):
    """" Set value for address. """
    data_store[address] = value

if __name__ == '__main__':
    try:
        app.serve_forever()
    finally:
        app.shutdown()
        app.server_close()

Modbus TCP Client

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import socket

from umodbus import conf
from umodbus.client import tcp

# Enable values to be signed (default is False).
conf.SIGNED_VALUES = True

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect(('localhost', 502))

# Returns a message or Application Data Unit (ADU) specific for doing
# Modbus TCP/IP.
message = tcp.write_multiple_coils(slave_id=1, starting_address=1, values=[1, 0, 1, 1])

# Response depends on Modbus function code. This particular returns the
# amount of coils written, in this case it is.
response = tcp.send_message(message, sock)

sock.close()
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