The information contained in this document is subject to change. This document contains proprietary information, which is protected by copyright
laws. All rights are reserved. No part of this document may be photocopied, reproduced or translated to another language or program language
without prior written consent of RFI Engineering B.V.
RefGuide_U-routerNGW_v1.01.docx
Page: 20(
57)
11 Connecting External Relay(s) to the Expansion Port
The RJ11 expansion port can be used to attach additional peripherals to the U-router NGW. First of
all, the two middle pins on the connector are attached to a dry contact. This contact is a low power
relay that can be used for remote controlling low power devices. In order to connect the relay contact
to the low power device you can use a cable with an RJ11 connector. The two middle pins (pin 3 and
4) of the RJ11 connector are connected to the relay, whereby the relay is normally open. This contact
is closed as soon as the relay is activated.
A typical installation of the U-router NGW is together with a Remote Power Switch. This remote
power switch allows the U-router NGW to control the power connection of a connected enterprise
router or switch. Power to the enterprise router can be cycled by operating the Remote Power Switch
from the U-router NGW.
There are multiple possibilities for connecting Remote Power Switches to the U-router NGW.
1.
The U-router NGW contains a low power relay for switching purposes. This low power relay
can be used to drive a (bigger) slave relay for switching high voltages and/or high currents.
2.
The U-router NGW contains an RS485 industrial serial bus that can be used to connect
remote devices communicating over RS485 serial interfaces.
The following paragraphs describe how to connect remote power switches to the U-router NGW.
11.1 Using a slave Remote Power Switch with the U-router NGW
A slave Remote Power Switch connects to the dry contact of the U-router. You can use RFI
Engineering’s Remote Power Switch: RE.99.R1NC.
Figure 14: RE.99.R1NC Remote Power Switch
The state of the relay in the Remote Power Switch follows that of the relay inside the U-router NGW.
The internal relay of the U-router NGW will always show up as Relay#0.
The U-router NGW monitors the connection of a Remote Power Switch. When the Remote Power
Switch is connected the status changes from ‘RPSW disconnected’ to ‘RPSW Connected: Mains
ON/OFF’.
