This section explains how to wire a TapHome installation: how to lay out the RS-485 bus that connects TapHome modules and Modbus RTU devices, where the 100 Ω termination resistor goes, and how to protect the bus with galvanic isolation or surge protection. It is for anyone who connects modules, sensors and Modbus devices to the Core. The overview below points you to the page for each wiring task.
Documentation
Wiring
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Wiring tasks
8 pages · 2 areas
Bus topology and protection
- 01 Choose a bus topology and stay within the limit of 32 modules on one bus Serial Bus
- 02 Add four RS-485 ports with a USB Bus Extender and place its termination resistor Bus Extender
- 03 Separate two power systems with an optical bus isolator when the slave side has its own supply Optical Isolation
- 04 Connect energy meters and devices in another building over LAN on fiber, or add a second Core Another Building
- 05 Protect an RS-485 or Modbus bus that runs outdoors from induced surge voltage Surge Protection