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Python, using variables in pymodbus.utilities.computeCRC


Python, using variables in pymodbus.utilities.computeCRC

By : kennet aggestrup
Date : November 20 2020, 03:01 PM
wish of those help Here is how you can use the CRC generator for your need , There is a subtle difference on how to the input needs to be passed depending on the python version (2.7 or 3.x).
Python3 and Pymodbus==1.3.2
code :
import pymodbus.utilities
from pymodbus.compat import int2byte
meins=[]
meins.append(0x10)
meins.append(0x33)
meins.append(0x01)
meins.append(0x01)

meins1=b''
for i in meins:
    meins1 = meins1 + int2byte(i)

meins2=b'\x10\x33\x01\x01'

meins3=bytearray.fromhex("10330101")

crc=hex(pymodbus.utilities.computeCRC(b'\x10\x33\x01\x01'))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins1))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins2))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins3))
print(crc)
0x34bb
0x34bb
0x34bb
0x34bb
0x34bb
import pymodbus.utilities
from pymodbus.compat import int2byte
meins=[]
meins.append(int2byte(0x10))
meins.append(int2byte(0x33))
meins.append(int2byte(0x1))
meins.append(int2byte(0x1))

meins1=''
for i in meins:
        meins1 = meins1 + i

meins2='\x10\x33\x01\x01'

meins3=bytearray.fromhex("10330101")
meins3=''.join(str(meins3))

crc=hex(pymodbus.utilities.computeCRC('\x10\x33\x01\x01'))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins1))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins2))
print(crc)
crc=hex(pymodbus.utilities.computeCRC(meins3))
print(crc)
0x34bb
0x34bb
0x34bb
0x34bb
0x34bb


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Python pymodbus in gui class

Python pymodbus in gui class


By : user3029626
Date : March 29 2020, 07:55 AM
I hope this helps . I am trying to develop a python gui application which communicates with a PLC using pymodbus. Using the documentation from the website & what I've found online, I can easily communicate & everything works perfectly. I am struggling with how to incorportate all this into a gui class with various methods. I am new to python & oo programing as my background is in mechanical engineering. , Turn the client into an instance attribute of this GUI:
code :
def modbusConnect(self):
    #modbus connection
    ipaddress = str(self.lineEdit_IP.text())
    self.client = ModbusTcpClient(ipaddress)
def dialValueChanged(self):
    [... 7 lines omitted from output ...]
    self.client.write_coil(some_register, setvalueint)  #write_coil or write_register, depends on your communication
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By : ChyPhix
Date : March 29 2020, 07:55 AM
this one helps. This loader will do the job
https://github.com/shakacode/sass-resources-loader
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By : vincent paul
Date : March 29 2020, 07:55 AM
Any of those help Refer the issue raised in the Github and follow up from the contributor.
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By : Alex
Date : March 29 2020, 07:55 AM
seems to work fine first I think you have some mistake in your code. With pymodbus 1.2.0 the code should look like this:
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By : sachininfosys
Date : March 29 2020, 07:55 AM
like below fixes the issue You are not calling "commit()" for cursor C2. You are simply closing the connection. As a result of this your changes won't be written to the database.The sqlite documentation clearly mentions this. See here. Try doing a c2.commit() before closing the connection and see if the data is getting written or not.
If this does not work, please share the error you are getting. It will be helpful in understanding the problem.
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