QuickStart Guide REX 200/250 | Version 5 | 26.05.2021 5
2 Introduction to the function of the REX 200/250
The REX 200/250 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 settings in the myREX24 V2 portal and shows how to transfer the configuration made there to the
REX 200/250 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 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 ma-
chine network. Internal switch functions are active even if the REX 200/250 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 variants) are required for access to a GSM
network. This serves the purpose of identifica-
tion for the network operator. The insert is
found on the left housing side. In order to un-
lock 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 200/250 is designed exclusively for operation with safety extra-low voltage (SELV / PELV) and is
supplied 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.
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