Westermo RM-80 - Manual (Page 5)

5 6193-4201
Chapter One INTRODUCTION
The RM-80 Wireless Ethernet module provides wireless connections between Ethernet
devices or Ethernet wired networks (LAN’s). It has an internal 869 MHz wireless trans-
ceiver, which can be used without a radio license in Europe and South Africa. The RM-80
transmits RF power of 500mW, requiring the transmit duty-factor be limited to 10%.
The RM-80 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 up
to 76 Kbit/sec.
1.1 Network Topology
The RM-80 is an Ethernet device, and must
be configured as part of an Ethernet net-
work. Each RM-80 must be configured as:
… an “Access Point” or a “Client”, and
… a “Bridge” or a “Router”.
You can also connect to the RM-80 via a RS-232 or RS-485 serial port using PPP
(point-to-point) protocol. PPP allows the RM-80 to connect serial communications
into the Ethernet network.
Access Point vs Client
The Access Point unit acts as the
“wireless master” unit. The Access
Point sets up the wireless links
to the Client units, and controls
the wireless communications. The
first diagram shows two Ethernet
devices being linked. One RM-80
is configured as an Access Point and one as
a Client – in this example it doesn’t mater
which unit is the Access Point.
The second diagram shows an existing LAN
being extended using RM-80’s. In this exam-
ple, the Access Point should be configured at
the LAN end – although the wireless link will
still work if the Client is at the LAN end.
An Access Point can connect to multiple
Clients. In this case, the Access Point should
be the “central” unit.
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