B&B Electronics ESR902W User Manual
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.
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.
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.
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.
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.
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:
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
• 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.
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
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.
to use a null modem (crossover) cable.