how to rewrite ModbusSerialClient(method='rtu' , ...) for pymodbus 3.0.2 ?

[dreamflow]

how should this pymodbus 2.5.3 code

from pymodbus.client.sync import ModbusSerialClient`
client = ModbusSerialClient(method='rtu', port='COM31', baudrate=9600)

be rewritten for pymodbus 3.0.2 ?

instead of
method='rtu'
i've tried
framer='rtu'
framer='ModbusRtuFramer'
but got an error .

[janiversen]

Read the documentation

[dreamflow]

with pymodbus 3.0.2 i've found now via the documentation

from pymodbus.transaction import ModbusRtuFramer
client = ModbusSerialClient(framer=ModbusRtuFramer, port='COM31', baudrate=9600)

so far so good 😊

but my code translation attempt of my next code line from pymodbus 2.5.3 syntax

result = client.read_holding_registers(53, 2, unit=1)

to pymodbus 3.0.2 syntax

result = client.read_holding_registers(address=53, count=2, slave=1)

gives the
NameError: name 'serial' is not defined
what is not correct ?

[janiversen]

I have no idea ! it gives you a line and file name, which should help you identify where the problem is.

And btw, you syntax is valid, but this is not the most simple way to make the call, again look at the documentation.

Did you look at the examples, your import is also wrong, and you miss code.

[dhoomakethu]

You will have to install pyserial , it should have been installed by default. Please check if you are running inside correct python environement with all the required dependencies installed.

[dreamflow]

You will have to install pyserial , it should have been installed by default.

that solved the problem ,
after installing pyserial it works fine 😃.
thank you @dhoomakethu and @janiversen .

i'm on python 3.11.0 on Win10-21H2 .
by running
pip install pymodbus
pyserial is not installed .
i have to also run
pip install pyserial .

[janiversen]

Pyserial is NOT installed by default, nor should is have been, see

https://github.com/riptideio/pymodbus#installing

@dhoomakethu I do not understand why you say it should be installed by default even in 2.5.3 pymodbus was pr default installed without dependencies.

[dhoomakethu]

OK, my mistake then.