A simple interface for Modbus over TCP/IP
- Read and write modbus registers
- Support for promises and callbacks
const modbus = require('modbus-tcp-ip')
const device = modbus(ipAddress,port,unitId)
//Read
let myCoil = await device.read('c0')
let myHoldingRegister = await device.read('hr0')
let myHoldingRegisters = await device.read('hr1-2')
//Write
await device.write('c0',true)
await device.write('hr0',15)
const modbus = require('modbus-tcp-ip')
const device = modbus(ipAddress,port,unitId)
- ipAddress
- port
- unitId
- timeout
- online
- address - Coil or register to read.
- callback(err,res) - Optional.
- address - Coil or register to read.
- value - Data to write.
- callback(err,res) - Optional.
[Short Hand + Register Number]
- 'i8' - Descrite Input 8
- 'hr418' - Holding Register 418
- 'hr418-419' - Holding Registers 418 through 419
Data Type Short Hand Size Accessibility
Descrite Input i 1 Bit Read Only
Coil c 1 Bit Read / Write
Input Register ir 16 Bits Read Only
Holding Register hr 16 Bits Read / Write
- FC1 - Read Coil
- FC2 - Read Input
- FC3 - Read Holding Registers
- FC4 - Read Input Registers
- FC5 - Write Single Coil
- FC6 - Write Single Register
- FC15 - Write Multiple Coils
- FC16 - Write Multiple Registers