Ascii is working completely fine but RTU is not working . When I tried to communic

Try the connectRTUBuffered <div class="snippet-cl

Getting Crc Error in RTU about node-modbus-serial HOT 4 CLOSED

yaacov commented on August 16, 2024

Getting Crc Error in RTU

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Comments (4)

dedhdude commented on August 16, 2024

Even Tried RTUBuffer

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yaacov commented on August 16, 2024

Try the connectRTUBuffered

client.connectRTU("/dev/ttyAMA0", {baudrate: 9600, dataBits: 8, parity: 'even', stopBits: 1})
  .then(read)
  .catch(console.log)

will become:

client.connectRTUBuffered("/dev/ttyAMA0", {baudrate: 9600, dataBits: 8, parity: 'even', stopBits: 1})
  .then(read)
  .catch(console.log)

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yaacov commented on August 16, 2024

can you check using the pymodbus:

a. install ( if you have python and pip )

$ sudo pip install pymodbus
...

b. run python

$ python
Python 2.7.13 (default, Jan 12 2017, 17:59:37) 
[GCC 6.3.1 20161221 (Red Hat 6.3.1-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from pymodbus.client.sync import ModbusSerialClient as ModbusClient
>>> client = ModbusClient(method='rtu', port='/dev/ttyAMA0', timeout=1)
>>> client.connect()
True
>>> client.read_holding_registers(5,2).registers
[234, 234]
>>>

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yaacov commented on August 16, 2024

Checked against ArduinoESP running TCP and RTU modbus, no crc errors.

Arduino code:
https://github.com/yaacov/ArduinoModbusESP

Test used as client:
https://github.com/yaacov/node-modbus-serial/blob/master/examples/simple.js

Fixed in v5.2.6 , closing.

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