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

The parameterization is carried out via the alarm management in the myREX24 V2 portal. Alternatively,  

the input and output functions could also be displayed in a dashboard using the data point functions.  

When using outputs O1 and O2, the corresponding input signals I1 and I2 assume the respective  

output status and can themselves no longer be used externally for other alarm input signals.  

3.6 REX 100 WAN  

Connect the WAN interface of the REX 100 (P1 WAN) with a patch cable with the higher level (compa-  

ny) network/router. 3 LAN ports are available for connection to the machine network and for commis-  

sioning via PC.  

3.7 Antenna connection  

Only connect antennas that are included in the Helmholz accessories and ensure prior to installation  

that the antenna is positioned in such a way that the modems receive a permanent radio signal to a  

WLAN access point or can connect to an adequate 4G mobile network. Also be sure to follow the instruc-  

tions from the technical data sheets of the antenna manufacturer and do not install these into metal  

housings (e.g., control cabinet).  

3.7.1 REX 100 Wi-Fi  

The WLAN radio module only works in the 2.4 GHz range and it must be ensured that the required inter-  

net connection can be established via an existing access point in the (company) network. The required  

WLAN antenna is connected to the RP-SMA socket. The 4 LAN ports are then available for connection to  

the machine network and for commissioning/diagnosis via PC.  

3.7.2 REX 100 LTE (4G)  

For radio reception, a suitable antenna must at least be screwed  

onto the SMA socket “MAIN”.  

In order to improve the data throughput, a second antenna termi-  

nal is available on the REX 100 LTE router with the SMA socket  

“Rx” that can be used as an option. This functionality is called an-  

tenna diversity in the “WCDMA mode” and Downlink-MIMO in  

the “LTE mode”.  

The second receiver antenna should not be located in the immedi-  

ate vicinity of the main antenna. In order to improve the diversity  

gain and reduce other reciprocal interactions (interference effects),  

the two antennas should be (taking the space available in the ap-  

plication into account) installed with the greatest possible distance  

between them.  

For the same reason, the second antenna should be mounted cross-polarized (rotated by 90° in relation to  

the main antenna).  

QuickStart Guide REX 100 | Version 14 | 22.01.2025  

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