ELPRO TECHNOLOGIES

Wireless Ethernet Modem 945U-E
Product Overview
The 945U-E forms part of ELPRO Technologies 802.11 based wireless
Ethernet modem range. The 945U-E combines the benefits of reliable
distance communications at 900MHz with data throughputs to 54Mbps
(country regulation dependant).
The 945U-E is an Access Point/ client, bridge/ router and serial server
(RS232/485) with AP to AP repeatability (WDS) to increase communications
distance. Filtering/security measures include MAC address and IP filtering
and encryption to WPA2; 802.11i enterprise level standard. I/O capability can
be added when combined with ELPRO’s 115S expansion units.
ELPRO
TECHNOLOGIES
Industrial Wireless Technology
Features and Benefits
• 902-928MHz, 802.11 DSSS to 54Mbps (country regulation dependent).
• Up to 630mW RF power.
Applications
• Access Point/ Client, Bridge/ Router modes reducing inventory costs.
• IP/ PTZ cameras
• Serial client/ server/ multicast functionality (point-point;
point to multi-point) with simultaneous use of RJ45: RS232/ 485 ports.
• Roaming vehicle monitoring/ diagnostics
• Modbus TCP to Modbus RTU Gateway/ Modbus Master for I/O
transfer with additional slave I/O via ELPRO’s 115S expansion modules.
• PLC Communications
• Data logger communications
• Spanning Tree functionality (self heal).
• Mass notification systems
• AP - AP (WDS) repeatability.
• Agriculture sprayer control
• Encryption to WPA2, 802.11i.
• Water/ waste water systems
• MAC address/ IP filtering reducing network traffic.
• SCADA networks
• Online network diagnostics and configuration.
• Onboard DI/O channel for failure status or external status transfer.
• Lifetime Warranty and Global Technical Support.
Technologies
Understanding Practical Ethernet Commissioning
When choosing which type of industrial wireless Ethernet to commission for
your application, several aspects should be considered...
Which Wireless Ethernet Is Right For My Application?
900 MHz Channels
902
Several factors should be considered when choosing which
industrial wireless Ethernet is right for your application: country
regulatory dependent.
907
912
915
5 MHz Ch 11
917
922
928
5 MHz Ch 31
5 MHz Ch 21
5 MHz Ch 41
10 MHz Ch 12
10 MHz Ch 32
10 MHz Ch 22
10 MHz Ch 42
20 MHz Ch 24
Reliable Communications Distance
20 MHz Ch 34
USA/Canada (902 - 928MHz)
Reliable wireless Ethernet communications is fundamentally
determined by a few key factors: the amount of Radio
Frequency (RF) power emitted from the antenna (government
regulated), the lowest level that the receiving module can
reliably demodulate (ie receiver sensitivity) and the frequency
waveform properties relative to the terrain over the distance
required of the application.
Frequency and Terrain
Radio signals are transmitted between the sending and
receiving units. The radiated radio signals form an elliptical
path of concentric circles known as a Fresnel zone. The radio
path may be described as either obstructed or line of sight.
It is the level of obstruction relative to the frequency waveform
and its Fresnel zone that determines the success level of
communications. Higher frequencies such as 2.4/5GHz have
smaller waveforms and can be susceptible to obstructed paths
and congestion. 900MHz waveforms are more reliable in nonline of sight distance applications due to greater diffraction
(bending), reflection (bouncing) and susceptibility to multipath
fading of the waveform (relative to higher frequencies).
RF Power
Fresnel Zone
Receiver
Sensitivity
Terrain
Australia (915 - 928 MHz)
Image depicts bandwidth and channel size as per country regulations.
Understanding the 945U-E Advantage
The majority of 900MHz Ethernet products use Frequency
Hopping Spread Spectrum (FHSS) as the modulation method
in their design. FHSS products hop throughout the channels
in the radio spectrum, hopping to the next available channel
when communicating and/or experiencing interference.
Due to the size and the use of a small number of channels,
FHSS products are limited in their data throughput capabilities.
RF Amplitude
Tn
Tf
T1
Ch1
Ch2
Ch f
Time
Ch n
Channels
Frequency band
FHSS devices scan the channels within the band hopping channels in
communicating and/or when experiencing interference.
ELPRO’s 945U-E’s innovative design uses Direct Sequence
Spread Spectrum (DSSS) modulation allowing significant gains
in data throughput compared to traditional FHSS devices.
This allows end users to benefit from 900MHz transmission/
propagation and high data throughputs in distance
applications.
Distance
802.11 2007 for Wireless LANs
Wireless modulation transmission technique (ie DSSS with chipping key).
Image demonstrates the Fresnel zone between two antennas over the
distance required of the application. It is the amount of obstruction relative to
the waveform Fresnel zone (and other factors) that determines success.
The 900MHz Radio Spectrum
The 900MHz radio spectrum is regulated by government
communications regulatory authorities. These bodies stipulate
both bandwidth size and the number of channels available for
use. As such the 945U-E supports up to 4 channels depending
on regulations within the country of use. This has an impact on
the potential data throughput available to the end user (eg USA
up to 54Mbps and Australia up to 13.5Mbps).
Coding schemes
(eg CCK, OFDM)
prepare the data
helping to combine
multiple bits for
DSSS transmission.
Chipping key helps
spread the data for
DSSS transmission
(multiple channel
simultaneous data
transmission).
Chipping keys and
coding schemes
help to reformulate
the data.
All DSSS require good SNR’s to be effective.
DSSS devices use both coding schemes and chipping keys to spread the data
and reform the same data allowing greater data communications throughput.
Summary
ELPRO’s 945U-E innovative design allows distance
communications with greater data throughput, providing
end users with an alternative option where higher frequency
Ethernet products may not be suitable (eg IP/PTZ cameras).
945U-E System Design Advantages
The 945U-E range is feature rich allowing end users to create complex, reliable
engineering solutions for process and automation systems.
Access Point Repeating and Serial Server
WDS, Modbus Master - Slave, DHCP
System advantages of the 945U-E range includes serial
client /server /multicast (RJ-45 to simultaneous RS232/485)
connections with online diagnostics and configuration
capability. The units can provide standalone Modbus MasterSlave functionality within the network and additional modules
are readily added to the system with DHCP automatic IP
addressing capability.
AP
(Modbus Master)
AP
Field
Devices
LAN
RS232
Client
(Modbus Slaves)
AP
In the diagram top right, the LAN is connected serially to the
field devices via an AP using serial server capability. A Modbus
Master AP also polls Modbus slave I/O (A -> B).
Client
RS485
(Automatic
IP address
via DHCP)
Modbus
slave I/O B
Modbus
slave I/O A
Access Point Repeating with Self Healing of Network
WDS and Self Heal Mesh
Using WDS (AP-AP) and Spanning Tree (self-healing) features
of the 945U-E allows distance linkage in bridge /router modes
and preservation of system communications in the event of a
site outage.
AP
In the diagram bottom right, LAN’s A and B are connected by
the middle AP. Loss of power (site outage) to the middle AP
creates a communications failure but traffic is automatically
diverted through redundant AP modem to LAN B.
(Site Outage)
LAN A
AP
Modbus slave
Data Logger
Client
LAN B
AP
Product comparison and ordering guide (includes existing 240U-E, 245U-E and 905/805U-E products)
245U-E-G
245U-E-A
945U-E
(1)
Frequency
2.412 - 2.472GHz
5.18 - 5.825GHz
902-928MHz
Modulation
802.11b/g
802.11a
802.11 g
TX Power
15 - 400mW
Data Rate
(2)
(2)
240U-E
(1)
905U-E
805U-E
2.412 - 2.462GHz 902 - 928MHz
802.11b
(1)
802.11-FHSS
869MHz (1)
802.11- FF(4)
(2)
10,100 - 500mW(3)
15 - 400mW
15 - 630mW
100 /300mW
100mW - 1W
108Mbps
108Mbps
54Mbps
11Mbps
200Kbps
72Kbps
WDS (AP-AP)
Yes
Yes
Yes
Yes
No
No
Self Heal
Yes
Yes
Yes
Yes
Yes
Yes
(Spanning Tree)
Serial Client /Server /Multicast
Yes
Yes
Yes
Yes
Yes
Yes
Encryption Security Level
(Maximum level highlighted)
WPA2 /802.11i
WPA2 /802.11i
WPA2/802.11i
WPA - PSK (TKIP
/ AES 128 bit)
128 bit AES
Encryption
128 bit AES
Encryption
MAC / IP Filtering
Yes
Yes
Yes
Yes
Yes
Yes
Network Function
AP /Client
Bridge /Router
AP /Client
Bridge /Router
AP /Client
Bridge /Router
AP /Client
Bridge /Router
AP /Client
Bridge /Router
AP /Client
Bridge /Router
Online Diagnostics
Yes
Yes
Yes
Yes
Yes
Yes
Online Configuration
Yes
Yes
Yes
Yes
Yes
Yes
Footnote:
(1) Frequency availability - country regulatory dependant.
(2) Configurable TX Power option available - country regulations apply.
(3) Model dependant relative to regulatory guidelines.
(4) Fixed Frequency (FF).
945U-E
ELPRO Technologies is an ISO 9001:2008
Quality Assured Company.
Wireless Ethernet Modem
Wireless Specifications
Ethernet Port
Frequency band
Standard
USA: 902-928MHz; 1 - 54Mbps (configurable)
AUS: 915-928MHz; 0.25 - 13.5Mbps (configurable)
‘Auto mode’ determines fastest rate possible relative to RSSI.
Serial Port
Receiver sensitivity
USA: -95 dBm @ 1 Mbps - 72 dBm @ 54 Mbps
AUS: -95 dBm @ 0.25 Mbps; -72dBm @ 13.5Mbps
Channel Spacing
4 x 5MHz; 4 x 10MHz; 2 x 20MHz channels*.
Transmit Power
USA: 1-24 Mbps:630mW (28dBm) - 54Mbps:250mW (24dBm)
AUS: 0.25-6Mbps:630mW (28dBm); 13.5Mbps:250mW (24dBm)
Line of sight range
6+ miles/ 10+ km @ 630 mW
(Range may be extended using WDS, antenna diversity)
Antenna connector
10/ 100 BaseT; RJ45 - IEEE 802.3
RS232
DB9 female DCE; RTS/ CTS/ DTR/ DCD
(hardware signals provided)
RS485
2 pin terminal block
(max distance 4000’/1.2km - non isolated)
Data rate (bps)
configurable
1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600,
76800, 115200, 230400.
7 or 8 data bits, Stop/ start/ parity bits configurable.
USA/AUS: 2 x Female SMA (Surge diverter: CSD-SMA-2500)
(2 x antennas for signal diversity or high gain receive antenna)
General
Compliances
System Configuration Parameters
•
EMC
EN 301 489 - 17; FCC Part 15
System address
(ESSID)
•
Radio
EN 300 328; FCC Part 15.247, RSS 210
•
CSA
Class I, Division 2 (pending)
•
Safety
EN 60950
1 - 31 character text string
Security
•
Data encryption To WPA2 PSK - 802.11i - 802.1x
•
Password
https accessibility
Bandwidth Protection
MAC Address
IP Filtering
ARP Filtering
Configurable
Whitelist/ Blacklist
Whitelist/ Blacklist
Whitelist/ Blacklist
Access Point or Client/ Bridge or Router Broadcast or Control.
Mode - Point to Point, Point to Multi-point. WDS Wireless
Distribution System (AP - AP repeater functionality).
Modbus TCP/ RTU Gateway.
Serial client/ server/ multicast, simultaneous RS232/ 485
connection.
On-board Modbus Master for I/O transfer.
4.5 x 6.7 x 1.2”/ 114 x 168 x 30 mm
Housing
Powder-coated, extruded aluminium
Mount
DIN rail
Terminal blocks
Removable; Max conductor 12 AWG (2.5mm2)
Temperature
-40 to +60°C ; -40 to +140°F
Humidity
0 – 99% RH non-condensing
Weight
<0.5kg (<1lb)
Power Supply
Nominal supply
9 to 30VDC; under/ over voltage protection
Average current draw
Idle 12V - 270mA; Idle 24V - 140mA
Full TX (630mW) 12V - 470mA;
Full TX (630mW) 24V - 250mA
Protocols supported
TCP/ IP, UDP, ARP, SNMP, RADIUS/ 802.1x, DHCP,
DNS, PPP, ICMP, HTTP, FTP, TFTP, TELNET.
Transmit current draw
User Configuration
Embedded web page default URL.
Note: Specifications subject to change
•
Discrete I/O
Input voltage-free contact/ output FET 30VDC 500mA. Used to
transfer input/ output status: communications failure output.
Ordering Information
When ordering, please specify the following:
Diagnostics
Diagnostics/ LED
indication
Power/OK; RX; TX/Link; RS232; LAN; RS485;
Digital I/O status
Reported diagnostics RSSI measurement in dBm. Connectivity information/
statistics. System Log file.
Ethernet Port
Indication
* Country Regulation Dependent.
Link/ 100 Mbps
Order Code
Description
Frequency
RF Power
945U-E
Wireless Ethernet 802.11,
900MHz high speed.
907-922MHz DSSS
630mW
Note: Specifications subject to change.
•
Specify country of application on ordering.
•
RF power and frequency may vary depending on country of application.
THINK WIRELESS... THINK ELPRO
Technologies
Contact ELPRO
Regional Offices:
Web site www.elprotech.com
E-mail sales@elprotech.com
Americas
+ 1 619 741 3574
Australasia
+ 61 7 3352 8600
Technical Support:
Singapore
+ 65 6487 7887
USA/Canada
+1 866 713 4409
Other countries +61 7 3352 8624
Europe
+ 44 1582 723633
China
+ 86 01085625718-868
YOUR LOCAL PARTNER:
Elp_bro_945U-E_v2.0
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