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Chapter One
INTRODUCTION
The RM-240 Industrial WiFi Wireless Ethernet module provides wireless connections
between Ethernet devices or Ethernet wired networks (LAN’s). It complies with the IEEE
802.11b standard. The RM-240 has an internal 2.4GHz direct sequence spread spectrum
(DSSS) wireless transceiver, which can be used without a radio license in most countries.
Users can select one of 11 x 5 MHz wide channels, with the first channel centred at
2.412 GHz.
Note that regulations in North America and part of Europe permit all 11 channels to be used
in these countries. Please check with your WESTERMO representative for the permitted channel
usage in your country.
The RM-240 unit also provides two serial connections as well as the Ethernet connec-
tions. It is possible to use all three data connections concurrently, allowing the RM-240
to act as a Device Server. Wireless connections can be made between serial devices and
Ethernet devices, however approriate driver applications are required in the host devices
to handle the different data format. The RM-240 does provide connection funtionality
between serial “Modbus RTU” devices and Ethernet “Modbus TCP” devices.
The RM-240 is available in two models with different RF power:
RM-240-100 100mW of RF power
RM-240-300 300mW of RF power
Note that European regulations do not permit more than 100mW of RF power to be used. In
USA, Canada and Australia, up to 1W of RF power may be generated. In other countries, please
check with your WESTERMO representative.
The RM-240 has a standard RJ45 Ethernet connection which will operate at up to
100Mbit/sec. The module will transmit the Ethernet messages on the wireless band at
rates between 1 and 11 Mbit/sec.
