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simple_sync_client.py
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simple_sync_client.py
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#!/usr/bin/env python3
"""Pymodbus synchronous client example.
An example of a single threaded synchronous client.
usage: simple_sync_client.py
All options must be adapted in the code
The corresponding server must be started before e.g. as:
python3 server_sync.py
"""
# --------------------------------------------------------------------------- #
# import the various client implementations
# --------------------------------------------------------------------------- #
import pymodbus.client as ModbusClient
from pymodbus import (
ExceptionResponse,
FramerType,
ModbusException,
pymodbus_apply_logging_config,
)
def run_sync_simple_client(comm, host, port, framer=FramerType.SOCKET):
"""Run sync client."""
# activate debugging
pymodbus_apply_logging_config("DEBUG")
print("get client")
if comm == "tcp":
client = ModbusClient.ModbusTcpClient(
host,
port=port,
framer=framer,
# timeout=10,
# retries=3,
# source_address=("localhost", 0),
)
elif comm == "udp":
client = ModbusClient.ModbusUdpClient(
host,
port=port,
framer=framer,
# timeout=10,
# retries=3,
# source_address=None,
)
elif comm == "serial":
client = ModbusClient.ModbusSerialClient(
port,
framer=framer,
# timeout=10,
# retries=3,
baudrate=9600,
bytesize=8,
parity="N",
stopbits=1,
# handle_local_echo=False,
)
else:
print(f"Unknown client {comm} selected")
return
print("connect to server")
client.connect()
print("get and verify data")
try:
rr = client.read_coils(1, 1, slave=1)
except ModbusException as exc:
print(f"Received ModbusException({exc}) from library")
client.close()
return
if rr.isError():
print(f"Received Modbus library error({rr})")
client.close()
return
if isinstance(rr, ExceptionResponse):
print(f"Received Modbus library exception ({rr})")
# THIS IS NOT A PYTHON EXCEPTION, but a valid modbus message
client.close()
print("close connection")
client.close()
if __name__ == "__main__":
run_sync_simple_client("tcp", "127.0.0.1", "5020")