B&B Electronics Server ESR901W485 User Manual download pdf (Page 7)

Introduction

Documentation Number: ESR90xW-4905m Chapter 1 5

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com

IEEE 802.11g

IEEE 802.11g standard specifies a WLAN that operates on the 2.4 GHz band

at data rates up to 54 Mbps, but is backward compatible with the earlier

802.11b standard (which operates at up to 11 Mbps). Systems can

incorporate 802.11b and 802.11g equipment and they will interoperate.

However, when connected into the same network the 802.11g equipment will

operate at the 11 Mbps limitation of the 802.11b equipment.

For media access, 802.11 wireless networks use CSMA/CA, a scheme in

which a station that intends to transmit ‘listens’ for traffic on the radio carrier

frequency and sends data packets if the frequency is clear. If the receiving

station receives the packet intact it sends an acknowledgement (ACK) to

confirm the packet has been received. If the transmitting station does not

receive an ACK it assumes a collision occurred and transmits again after a

random delay period.

Communications distances vary depending on the type and thickness of

material around an 802.11g node. The transmitter power output, the type of

antenna used and the amount of attenuation through materials also affects the

useable range. Electromagnetic noise, reflections, the amount of network

traffic, other radio devices operating in the same frequency band also affect

range and overall performance. In an infrastructure network the number of

access points and their coverage pattern also affect how well the system

operates. Typically an 802.11 device operating indoors will have a range

from 100 feet minimum to about 300 feet maximum. Outdoors, some

products, using high gain antennae may achieve line-of-sight ranges of five

miles or more.

Security is a significant concern for WLAN users. Whether security threats

originate intentionally or unintentionally, wireless systems are more

susceptible than wired systems. Vlinx ESR90xW offer several security

options including WEP (Wired Equivalent Privacy), LEAP (Lightweight

Extensible Authentication Protocol) and others.

Introduction

6 Chapter 1 Documentation Number: ESR90xW-4905m

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com

ESR90xW Startup Procedure

Setup and configuration of your Vlinx ESR90xW wireless serial server is

fast, straightforward and simple. You have several options from which to

choose. The following procedure outlines an easy way to get your server set

up and operational.

1. Package Checklist

To begin, check to see that you have everything you will require. The

contents of your ESR90xW package should include:

• One Vlinx ESR901W232, ESR901W485, ESR902W or ESR904W

Wireless Serial Server

• One SMA antenna

• One Operation Manual

• One Quick Start Guide

• One CD containing

o Device Detection software

o Serial-IP Virtual COM Port Software

o the Operation Manual (in pdf format)

o the Quick Start Guide (in pdf format)

2. Hardware Setup

1. Connect the antenna to your ESR90xW

2. Connect a standard Ethernet (CAT5/RJ-45 straight through) cable

from the PC network adapter to the ESR90xW Configuration Port

3. Connect 24 VAC or 12 to 30 VDC power to the ESR90xW

4. Connect the serial port on the ESR90xW to the serial port on your

serial device. This is optional during the initial configuration steps

but will be required for operation.

For RS-232 operation, your ESR90xW is configured as a DTE and uses a DB-

9M connector. Use a straight through RS-232 cable if your serial device is

configured as a DCE. If your serial device is configured as a DTE you will have

to use a null modem (crossover) cable.

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