TapHome to Modbus RTU / ASCII / TCP

Supported communication layers

• Modbus RTU via RS485 (BUS 1, BUS 2, or BUS 3 terminals)
• Modbus ASCII via RS485 (BUS 1, BUS 2, or BUS 3 terminals)
• Modbus TCP (via ethernet, connecting to local IP address or VPN)

Setup

1. Open Settings → Expose devices and select Add Interface. Select Modbus RTU, Modbus ASCII or Modbus TCP.
2. Define communication properties
   • 2.1 Modbus RTU or ASCII: Terminal (BUS 1, BUS 2 or BUS 3), Baud rate, Parity, Data bits, Stop bits
   • 2.2 Modbus TCP: TCP Port. (IP Address is set specifically for every device)
3. Add devices to be exposed
   • Each device will show brief overview how to access them in 3rd party system

Example: Switch:

Using Modbus TCP to connect to any other system

Simply Modbus is a great source if you are unfamiliar with the protocol. Using open source libraries for Modbus, you can connect TapHome installation with any other system that has possibility to develop a simple driver:

• NModbus4 - C# implementation of the Modbus protocol GitHub
• libmodbus - A Modbus library for Linux, Mac OS X, FreeBSD, QNX and Windows GitHub
• pymodbus - A full modbus protocol written in python GitHub
• digitalpetri / modbus - High-performance, non-blocking, zero-buffer-copying Modbus for Java GitHub
• goburrow / modbus - Fault-tolerant implementation of modbus protocol in Go (golang) GitHub
• node-modbus-tcp- NodeJS Modbus TCP/IP (GitHub)