ELPRO 805U-E Uživatelský manuál stáhnout pdf (Strana 7)

Chapter One Introduction

Page 7 © April 2007

Chapter One INTRODUCTION

The 805U-E Wireless Ethernet module provides wireless connections between Ethernet devices or

Ethernet wired networks (LAN’s). It has an internal 869 MHz wireless transceiver, which can

be used without a radio license in Europe and South Africa. The 805U-E transmits RF power of

500mW, requiring the transmit duty-factor be limited to 10%.

The 805U-E 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 805U-E is an Ethernet device, and must be configured as part of an Ethernet network. Each

805U-E must be configured as:

 an “Access Point” or a “Client”, and

 a “Bridge” or a “Router”.

You can also connect to the 805U-E via a RS232 or

RS485 serial port using PPP (point-to-point) protocol.

PPP allows the 805U-E 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

805U-E 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 805U-E’s. In this example, 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.

Client

Ethernet

Device

Access

Point

LAN

Ethernet Device

Client

Access

Point

LAN

Ethernet Device

Client

Access

Point

Client

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