It requires quite a lot of code to do a Modbus request, see below. This could be wrapped easily in a simple wrapper.
#!/usr/bin/env python
# scripts/examples/simple_tcp_client.py
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()
A solution should look something like this:
with tcp.Client('localhost', 502) as c:
resp = c.read_holding_registers(slave_id=1,starting_address=1, quantity=3)
It requires quite a lot of code to do a Modbus request, see below. This could be wrapped easily in a simple wrapper.
A solution should look something like this: