@modbus-ts/transport-tcp

Node.js TCP transport adapter for Modbus traffic.

Installation

pnpm add @modbus-ts/transport-tcp

Core Exports

• TcpTransportOptions
• TcpTransport

Minimal Example

import { TcpTransport } from '@modbus-ts/transport-tcp'

const transport = new TcpTransport({
  host: '127.0.0.1',
  port: 502,
  connectTimeoutMs: 5000,
  reconnectDelayMs: 300,
  maxReconnectDelayMs: 5000,
})

await transport.connect()
await transport.send(new Uint8Array([0, 1, 0, 0, 0, 6, 1, 3, 0, 0, 0, 1]))
await transport.close()

Behavior

• MBAP-based frame assembly from TCP stream
• Automatic reconnect with exponential backoff
• onConnect, onData, onClose callbacks

Packages

• high-level Modbus client
• shared contracts, types, and errors
• FC1/FC2/FC3/FC4/FC5/FC6/FC15/FC16 frame encode/decode for TCP/RTU/ASCII
• serial request queue with priority
• polling engine and range merge
• Node TCP transport with reconnect
• Node UDP transport
• browser WebSocket transport with reconnect
• typed Electron main/renderer bridge
• Electron IPC transport adapter
• WebSocket to TCP binary relay gateway
• register-value codec helpers
• shared async and comparison utilities