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11.2 Using RS485 (RIOT) Remote Power Switches with the U-router NGW
The RS485 Remote Power Switch (RPSW) communicates its internal state and can be operated by
sending and receiving commands over an RS485 network. The RS485 network consists of multiple
nodes connected in parallel to a bus. In case of the RS485 RPSW, the RS485 network is formed by
connecting multiple RPSWs together using the supplied RJ11-RJ11 extension cords.
The RS485 RPSW is meant to be connected to and operated from RFI Engineering’s’ U-router NGW.
Although the RPSW can be operated from third party routers using the Modbus protocol, this manual
focuses on how to connect the RPSW to the U-router NGW.
Below is a schematic diagram connecting multiple RPSW’s to a U-router NGW. The RPSW’s can be
daisy chained together using the loop-through RS485 interface connectors (RJ11).
A maximum of 32 RS485 devices, like the RPSW, can be connected to the RS485 bus of the U-router
NGW.
When connected to a U-router NGW, the remote power switches will be found automatically. Each
switch is identified by its RIOT address. In the user interface of the U-router the relays show up on
the ‘Relays’ page. Below is an example of the WEB interface of a U-router NGW showing multiple
connected RPSW’s.
