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

2 Introduction to the function of the REX 100  

The REX 100 is an industrial router suitable for worldwide remote access (depending on the REX variant)  

to IPv4-capable end devices (PLC, HMI, IP cameras, etc.). This Quick Start Guide explains the basic set-  

tings in the myREX24 V2 portal and shows how to transfer the configuration made there to the REX 100  

unit.  

No integration into a PLC engineering tool by means of a GSDML file is necessary and system states can  

be viewed and diagnoses can be carried out on the password-protected website of the device.  

Internet access and a valid account for the myREX24 portal are required for the configuration. The free of  

charge software shDIALUP for Windows operating systems is available to you by downloading from  

www.helmholz.de.  

We recommend using the current version (from V3.7R1.0) of the "shDIALUP" client software for  

commissioning. For a successful and secure connection to the myREX24 V2 portal, the firmware  

status of all REX 100 routers should be checked regularly and, if necessary, updated with the help of  

the system settings in your myREX24 account.  

3 Prepare and Connection  

Depending on the REX variant, the LAN ports P1 to P4 or P2 to P4 are available for connection to the  

machine network. Internal switch functions are active even if the REX 100 router is not connected to the  

Internet.  

For devices with a modem, antennas available as accessories and a mini-SIM card (except for Wi-Fi vari-  

ants) are required for access to a GSM net-  

work. This serves the purpose of identifica-  

tion for the network operator. The insert is  

found on the left housing side. In order to  

unlock and remove the insert, please press  

the recessed yellow button next to the card  

reader. Please use the supplied tool (SIM card  

ejector) for this.  

When selecting a mobile phone contract, please use a standard mobile phone data tariff. Please  

avoid IoT tariffs, because these are often only designed for small amounts of data or low transmis-  

sion speeds.  

3.1 Power supply  

The REX 100 is designed exclusively for operation with safety extra-low voltage (SELV / PELV) and is sup-  

plied with 24 V DC via the supplied connector.  

The housing of the REX 100 is not earthed. Please make sure to connect the functional earthing con-  

nection (FE) of the device to the reference potential of your control cabinet or system structure in order  

to ensure correct ESD derivation of the antenna and network sockets.  

The device is intended to be supplied by an isolated Limited Energy Source according to UL61010-1 (3rd ed cl. 9.4)  

or according to UL60950-1/UL62368-1 or Class 2 according to NEC. Please use Cu power supply wires, AWG 28-  

12. Maximum length of removed insulation is 10 mm. Temperature cable rating is 87 °C.  

QuickStart Guide REX 100 | Version 14 | 22.01.2025  

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