Helmholz 700-875-LTE11, 700-875-LTE61 REX 100 Router User Guide

3.2 Power source requirement  

This device may only be operated with power supplies that meet the requirements of EN 62368-1 for  

power sources of limited power. Otherwise, the device must be operated in a housing that meets the re-  

quirements of fire protection according to EN 62368-1.  

3.3 Terminals and Interfaces  

Rigid copper wires with a max. diameter of 1.5 mm² can be clamped onto the provided connector plug.  

Network cables corresponding to at least category 5/5e (CAT-5) should be connected to the RJ-45 sockets.  

3.4 Installation position/minimum clearances  

The router was designed to be mounted on DIN rails (as per DIN EN 50 022) and intended for installation  

in switch cabinets. Installation and mounting must take place in accordance with VDE 0100/IEC 364.  

The router can be installed in any position.  

It is recommended that minimum clearances to neighboring assemblies are observed during assembly. If  

the distances 30 mm on the top and on bottom and 10 mm on each side are maintained, easy access to  

the connections and contact options on the router is possible without having to remove other system  

parts. In addition, there should always be enough space for the necessary cable routing.  

3.5 Digital inputs/outputs IO1 and IO2  

The bidirectional connections IO 1 and IO2 can - independently of one another – be configured as digital  

inputs (standard setting) or as digital outputs.  

3.5.1 Inputs  

The alarm inputs can be activated  

with potential-free switches, buttons  

or relay contacts. IN1 can, for exam-  

ple, be used for the VPN establishing  

of connection with the myREX24  

portal. An alarm can be triggered  

with the IN2.  

Example wiring of the inputs:  

3.5.2 Outputs  

When selecting for the output circuit,  

the REX can provide the status of an  

active Internet, VPN or user portal  

connection as a signal. Each output  

can have a max. 0.5A (@ 24 V).  

Example wiring of the outputs:  

QuickStart Guide REX 100 | Version 14 | 22.01.2025  

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