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Modbus RTU over TCP #91

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azat385 opened this issue May 21, 2020 · 2 comments · May be fixed by #93
Closed

Modbus RTU over TCP #91

azat385 opened this issue May 21, 2020 · 2 comments · May be fixed by #93

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@azat385
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azat385 commented May 21, 2020 •
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Hello!

Is it possible to use rtu frame over TCP connection?
Slave rtu device is connected to pc via moxa nport 5150 through the ethernet. (Nport is changing just interface but not the messages)

Thanks a lot!
azat385 pushed a commit to azat385/uModbus that referenced this issue May 28, 2020
First attempt to add new feature to umodbus.client.serial.rtu
24d4050 
Sending rtu ADU over tcp socket aka "modbus rtu over tcp"

Should fix AdvancedClimateSystems#91
@azat385 azat385 mentioned this issue May 28, 2020
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@tiagocoutinho
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tiagocoutinho commented Nov 7, 2020 •
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@azat385 ,

You can create a Serial object which talks to moxa via raw socket or even RFC 2217 (I think moxa supports both in all models).
I recommend you use raw socket unless you need to change the serial line settings frequently (like using different baudrate)

Here is an example:

import serial
from umodbus.client.serial import rtu

serial_port = serial.serial_for_url("socket://moxa.acme.org:6610")
message = rtu.write_multiple_coils(slave_id=1, address=1, values=[1, 0, 1, 1])
response = rtu.send_message(message, serial_port)

serial_port.close()

Hope it helps.

@azat385
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azat385 commented Dec 7, 2020

@tiagocoutinho thanks a lot !

@azat385 azat385 closed this as completed Dec 7, 2020
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Add feature Modbus RTU over TCP azat385/uModbus
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@tiagocoutinho @azat385