Modbus rtu

In the Smart Home system, there is a Modbus RTU plugin implemented that enables interaction with devices using the Modbus RTU protocol. The plugin provides the ModbusRtu(FUNC, ADDRESS, COUNT, COMMAND) method, which allows sending commands and receiving data using the specified protocol.

Arguments of the ModbusRtu method:

1. FUNC: Modbus function code indicating the type of operation to perform with the device.
2. ADDRESS: Modbus device address to which the command is sent.
3. COUNT: Number of registers or bits to read or write.
4. COMMAND: Command to be executed, indicating additional parameters and settings.

Usage example:

const COMMAND = []
const FUNC = 'ReadHoldingRegisters'
const ADDRESS = 0
const COUNT = 16

const response = ModbusRtu(FUNC, ADDRESS, COUNT, COMMAND);
console.log(response);

The ModbusRtu method allows sending Modbus RTU commands, performing register reads or writes, and retrieving data from devices. You can use this method in your Smart Home project to interact with devices that support the Modbus RTU protocol.

Configuration:

• slave_id 1-32
• baud 9600, 19200
• data_bits 5-9
• timeout milliseconds
• stop_bits 1-2
• sleep milliseconds
• parity none, odd, even

Commands:

• Custom set

Attributes:

• Custom set

Status:

• Custom set

Available Functions

1-bit functions

ReadCoils ReadDiscreteInputs WriteSingleCoil WriteMultipleCoils

16-bit functions

ReadInputRegisters ReadHoldingRegisters ReadWriteMultipleRegisters WriteSingleRegister WriteMultipleRegisters

JavaScript Properties

• ENTITY_ID
• ModbusRtu
• entityAction
• Action

# Constant with a unique device ID
const ENTITY_ID

# Execute a command (function) on the device:
result = ModbusRtu(func, addr, count, command)

# Event handler function for actions:
entityAction = (entityId, actionName, args)->

state = {
  new_state: 'ENABLED',
  attribute_values: {
    heat: false
  },
  settings_value: {},
  storage_save: true
} 
# Save the state 
EntitySetState ENTITY_ID, state

snapshot in the database |

Example CoffeeScript code

# ModbusRtu
# ##################################
"use strict";

checkStatus = ->
  COMMAND = []
  FUNC = 'ReadHoldingRegisters'
  ADDRESS = 0
  COUNT = 16
  
  res = ModbusRtu FUNC, ADDRESS, COUNT, COMMAND
  print res.error
  print res.result
  print res.time

entityAction = (entityId, actionName, args)->
  switch actionName
    when 'ON' then doOnAction()
    when 'OFF' then doOffAction()
    when 'CHECK' then checkStatus()
    when 'ON_WITH_ERR' then doOnErrAction()