User Manual RelAir R2M · 07/2018 · VERSION 1.1
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RELAIR R2M
1 Functional description
The RelAir R2M allows you to integrate up to 63 Wireless M-Bus meters into your existing M-
Bus installation. For this purpose the OMS-compliant gateway stores the meter data and
answers a request by the M-Bus Master with the last answer telegram.
The Gateway receives devices with wireless M-Bus interfaces compliant with EN13757-4 at 868
MHz in S1, T1 or C1 mode and is OMS compliant. The RelAir R2M decodes unencrypted or
AES encrypted telegrams according to Mode 5 or 7.
For the different fields of application there are two different housing variants and an internal or
external antenna available. An elegant white wall cabinet is particularly suitable good for
installation in the homes, whereas the industrial variant comes in a robust and better protected
junction box.
Picture: Wireless M-Bus system with PadPuls M2W, RelAir R2M Gateway and PW250
Due to the integrated mini USB interface the RelAir R2M can also be used as a full operational
Wireless M-Bus Master, which e.g. in combination with MBSheet enables a read out. Our new
gateway works without an external power supply and is either supplied from the M-Bus (5
standard loads) or via the USB interface. One of both interfaces must be connected for
operation.
Attention: Never connect an M-Bus Master and a USB cable at the same time!
A configuration of the whitelist is absolutely necessary.
With the free PC software RelAirConf the setting of the parameters, the keys and the whitelists
is very comfortable.