ProSoft Technology RadioLinx RLXIB-IHW-66 User manual

RLXIB-IHW-66
802.11a, b, g
Industrial Hotspot
May 18, 2009
USER MANUAL

United States FCC & Industry Canada rules
OQ7IHW
3656A-IHW
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: The device
may not cause harmful interference, and it must accept any interference received, including interference that may
cause undesired operation.
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
CAUTION: Changes or modifications not expressly approved by the manufacturer could void the user’s authority to
operate the equipment.
Antenna spacing requirements for user safety
It is important to keep the radio's antenna a safe distance from the user. To meet the requirements of FCC part
2.1091 for radio frequency radiation exposure, this radio must be used in such a way as to guarantee at least 20 cm
between the antenna and users. Greater distances are required for high-gain antennas. The FCC requires a
minimum distance of 1 mW *cm2 power density from the user (or 20 cm, whichever is greater).
If a specific application requires proximity of less than 20 cm, the application must be approved through the FCC for
compliance to part 2.1093.
The installer of this radio equipment must ensure that the antenna is located or pointed in such a way that it does not
emit RF fields in excess of Health Canada limits for the general population; refer to Safety Code 6, obtainable from
Health Canada.
To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the
equivalent isotropically radiated power (EIRP) is not more than that required for successful communication.
Regulatory Approvals
Wireless Approvals
OQ7IHW
3656A-IHW
Visit our web site at http://www.prosoft-technology.com for current wireless approval information.
Ordinary Locations Hazardous Locations
243333
ATEX Zone 2 Category 3
ANSI/CSA - IEC60950-1/C22.2 No. 0-M91

RLXIB-IHW-66: ATEX Approval
II 3 G
Ex nA IIC T6 X
-30C° <= Ta <60°C
ProSoft Technology, Inc., Bakersfield, CA USA
Model: RLXIB-IHW-66
S/N: XXXXXXXXXX
Caution:
Read instructions before operating in Hazardous Areas
N. America
Product name: RLXIB-IHW-66
Safety Warning Statements
Explosive Atmosphere
Power, Input, and Output (I/O) wiring must be in accordance with the authority having jurisdiction
A Warning – Explosion Hazard – Do not make or break connections in an explosive atmosphere.
B Warning – DO NOT OPEN WHEN ENERGIZED.
European CE certification
The radio modem has been approved for operation under the RTT&E directive, passing the following tests: ETS300-
826 (EMC), ETS300-328 (Functionality), and EN60950 (Safety). LVD directive.
The following is the appropriate label that is applied to the radio modem product line to indicate the unit is approved
to operate with CE certification:
The following is the appropriate label that is applied to the radio modem product line shipping package to indicate the
unit is approved to operate with CE certification:
AUS BDK FIN
FDGR IRE
ILUX NL P
ESUK
Note: Member states in the EU with restrictive use for this device are crossed out. This device is also authorized for
use in all EFTA member states (CH, ICE, LI, and NOR).
IMPORTANT: This device is a 2.4-GHz, low-power RF device intended for office and home use in all EU and EFTA
member states, except in France where restrictive use applies.
Connecting Power to the RLXIB-IHW-66 Radio
The radio shall be installed by trained personnel only, as outlined to the installation instructions provided with each
radio.
The equipment shall be installed by a qualified installer/electrician. The installer/electrician is responsible for obtaining
a secured ground connection between the lug terminal on the surge protector to a verified common ground point
using a minimum 18 gauge wire. This must be done when attaching power lines to the radio during installation. .
A solid ground connection should be verified using a meter prior to applying power to the radio. Failing to secure a
proper ground could result in serious injury or death as a result of a lightning strike.

Your Feedback Please
We always want you to feel that you made the right decision to use our products. If you have suggestions, comments,
compliments or complaints about the product, documentation or support, please write or call us.
ProSoft Technology
5201 Truxtun Ave., 3rd Floor
Bakersfield, CA 93309
[phone]
[phone] (Fax)
http://www.prosoft-technology.com
Copyright © ProSoft Technology, Inc. 2009. All Rights Reserved.
RLXIB-IHW-66 User Manual
May 18, 2009
ProSoft Technology ®, ProLinx ®, inRAx ®, ProTalk®, and RadioLinx ® are Registered Trademarks of ProSoft
Technology, Inc. All other brand or product names are or may be trademarks of, and are used to identify products
and services of, their respective owners.
ProSoft Technology® Product Documentation
In an effort to conserve paper, ProSoft Technology no longer includes printed manuals with our product shipments.
User Manuals, Datasheets, Sample Ladder Files, and Configuration Files are provided on the enclosed CD, and are
available at no charge from our web site: http://www.prosoft-technology.com
Printed documentation is available for purchase. Contact ProSoft Technology for pricing and availability.
Asia Pacific: +603.7724.2080
Europe, Middle East, Africa: +33 (0) 5.3436.87.20
Latin America: +1.281.298.9109
North America: +1.661.716.5100

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Contents
United States FCC & Industry Canada rules......................................................................................2
Antenna spacing requirements for user safety...................................................................................2
Regulatory Approvals..........................................................................................................................2
RLXIB-IHW-66: ATEX Approval..........................................................................................................3
European CE certification...................................................................................................................3
Connecting Power to the RLXIB-IHW-66 Radio.................................................................................3
Your Feedback Please........................................................................................................................4
ProSoft Technology® Product Documentation...................................................................................4
1Start Here 7
1.1 About the RadioLinx® Industrial Hotspot™ ..............................................................7
1.2 Package Contents.....................................................................................................9
1.3 System Requirements.............................................................................................10
1.4 Install the IH Browser Configuration Tool................................................................10
1.5 Planning the Network..............................................................................................11
1.6 Configuring the Radios............................................................................................12
1.7 Verify Communication.............................................................................................21
2Installing the Radios 23
2.1 Connecting antennas ..............................................................................................24
3Diagnostics and Troubleshooting 25
3.1 Diagnostics..............................................................................................................26
3.2 Check the Ethernet cable........................................................................................26
3.3 LED display.............................................................................................................27
3.4 Retrieve the default password.................................................................................27
3.5 Troubleshoot RLX-IH Browser error messages......................................................28
3.6 Troubleshoot missing radios ...................................................................................29
3.7 Improve signal quality..............................................................................................29
4Radio Configuration / Diagnostic Utility 31
4.1 Radio Status............................................................................................................35
4.2 Radio Network settings ...........................................................................................41
4.3 Security settings......................................................................................................52
4.4 Radio access settings .............................................................................................55
4.5 Apply Changes........................................................................................................58
4.6 Cancel Changes......................................................................................................58
4.7 Factory Defaults......................................................................................................58
5RadioLinx Industrial Hotspot Browser 59
5.1 Primary radio functions............................................................................................60
5.2 File Menu.................................................................................................................61
5.3 Operations Menu.....................................................................................................63

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5.4 Dialogs Menu.......................................................................................................... 66
5.5 View Menu.............................................................................................................. 73
5.6 Help Menu............................................................................................................... 79
6Reference 81
6.1 Product Overview ................................................................................................... 81
6.2 Radio hardware ...................................................................................................... 82
7Glossary of Terms 85
8Support, Service & Warranty 99
8.1 How to Contact Us: Technical Support................................................................... 99
8.2 Return Material Authorization (RMA) Policies and Conditions............................. 100
8.3 LIMITED WARRANTY.......................................................................................... 101
Index 107

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1 Start Here
In This Chapter
About the RadioLinx® Industrial Hotspot™.............................................7
Package Contents...................................................................................9
System Requirements...........................................................................10
Install the IH Browser Configuration Tool..............................................10
Planning the Network ............................................................................11
Configuring the Radios..........................................................................12
Verify Communication ...........................................................................21
For most applications, the installation and configuration steps described in the
following topics will work without additional programming. ProSoft Technology
strongly recommends that you complete the steps in this chapter before
developing a custom application.
1.1 About the RadioLinx® Industrial Hotspot™
The RadioLinx® 802.11abg Industrial Hotspot™ (RLXIB-IHW) is a high-speed
wireless Ethernet radio, with PoE and Serial Encapsulation. The RLXIB-IHW
operates at speeds up to 54 Mbps, using the IEEE 802.11b/g (2.4 GHz band)
and 802.11a (5 GHz band) standards. Designed for global installations, the
RLXIB-IHW offers many Industrial features including hazardous location
certifications (pending), IGMP Snooping, OFDM for noise immunity, repeater
mode for mesh architecture/self healing, OPC server diagnostics, extended
temperature, high vibration/shock and din-rail mounting.
The RadioLinx® Industrial Hotspot (RLXIB-IHW-66) provides high speed
industrial wireless Ethernet communications between Ethernet devices such as
PLCs, I/O, and operator interfaces while serving as a repeater/bridge for other
hotspots, and an access point for wireless clients such as Laptops and PDAs.

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1.1.1 Specifications
Radio
Frequency Band
(Varies by Country) 802.11b/g:
2.412 to 2.462 GHz (FCC)
2.412 to 2.472 GHz (ETSI)
802.11a:
5.150 to 5.250 GHz (FCC/ETSI)
5.725 to 5.850 GHz (FCC)
Wireless Standards 802.11a, 802.11b, 802.11g, 802.11i
Transmit Power
(Programmable) Up to 50 mW
Channel data rates
(Modulation) 802.11b: 11, 5.5, 2, 1 Mbps (DSSS - BPSK, QPSK, CCK)
802.11g: 54, 48, 36, 24, 18, 12, 9, 6 Mbps (OFDM)
802.11a: 54, 48, 36, 24, 18, 12, 9, 6 Mbps (OFDM)
Receiver Sensitivity (Typical) -95 dBm @ 1 Mbps
-90 dBm @ 11 Mbps
-82 dBm @ 24 Mbps
-75 dBm @ 54 Mbps
Channels Selection 1 to 13 (802.11b/g)
36, 40, 44, 48, 149, 153, 157, 161, 165 (802.11a)
Security WPA2/802.11i with 128/192/256 bit AES-CCM
Legacy WPA TKIP, WEP support
MAC ID filter
Admin password
Physical
Enclosure IP-66 rated die-cast aluminum with pole mount hardware
6 = Dust tight - No ingress of Dust
6 = Protected against water jets against the enclosure from any
direction shall have no harmful effects.
Overall Dimensions 213 x 178 x 56 mm / 8.4 x 7.0 x 2.2 inches (W x H x D)
Ethernet Ports Water/Dust Tight M12 connector
IEEE 802.3, 802.3u, 802.3x, 802.3af
Antenna Ports (2) N-type female connectors
Weight 2.4 lb (1kg)
Environmental
Operating Temperature -30° C to +60° C
Humidity To 90% RH, non-condensing
External Power 802.3af PoE
Average Power <6W

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1.2 Package Contents
Your RLXIB-IHW-66 Industrial Hotspot is shipped with the following:
In addition, you will need:
A personal computer equipped with an Ethernet port
Static IP address, Subnet Mask and Gateway information for each RLX
device you plan to install. You can obtain this information from your system
administrator.
Note: This Startup Guide is designed for use with two RLXIB-IHW-66 radios. One radio will be
setup as a Master (AP) while the other radio will be set up as a remote repeater.

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1.3 System Requirements
The RadioLinx IH Browser configuration tool is designed for Microsoft Windows
XP, 2000 and 2003. Minimum hardware requirements are:
Pentium® II 450 MHz minimum. Pentium III 733 MHz (or better)
recommended
Supported operating systems:
oMicrosoft Windows XP Professional with Service Pack 1 or 2
oMicrosoft Windows 2000 Professional with Service Pack 1, 2, or 3
oMicrosoft Windows Server 2003
oMicrosoft Windows Vista
128 Mbytes of RAM minimum, 256 Mbytes of RAM recommended
CD-ROM drive
100 MB available hard drive space
Available RS-232 serial port and null modem cable
256-color VGA graphics adapter, 800 x 600 minimum resolution (True Color
1024 x 768 recommended)
Ethernet hub with standard RJ45 Ethernet cable
or
Ethernet port with RJ45 crossover cable for direct connection to module
A web browser, for example Microsoft Internet Explorer or Firefox.
In addition, you will need
A connection to an existing wired or wireless Ethernet network, with a Static
or Dynamic IP address for your computer
Static IP address, Subnet Mask and Gateway address for each RadioLinx
device you plan to install. Obtain this information from your system
administrator
1.4 Install the IH Browser Configuration Tool
1 Insert the ProSoft Solutions CD in your CD-ROM drive. On most computers,
a menu screen will open automatically. If you do not see a menu within a few
seconds, follow these steps:
a Click the Start button, and then choose Run.
b In the Run dialog box, click the Browse button.
c In the Browse dialog box, click "My Computer". In the list of drives,
choose the CD-ROM drive where you inserted the ProSoft Solutions CD.
d Select the file prosoft.exe, and then click Open.
e On the Run dialog box, click OK.
2 On the CD-ROM menu, select Setup Software under RLXIB-IHW-66
Industrial Hotspot. This action opens the Setup Wizard for IH Browser.
3 Follow the instructions on the installation wizard to install the program with its
default location and settings.
4 When the installation finishes, you may be prompted to restart your computer
if certain files were in use during installation. The updated files will be
installed during the restart process.

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1.5 Planning the Network
Before you configure and install the network, you should create a plan for it. The
following points assume that you are creating a bridge network of masters and
repeaters, but you can also set up clients to work with devices on existing
wireless LANs. For information, see Set Up a Client.
To begin, determine where you need radios and then choose locations for them
accordingly. For example, you might decide to install your master radio near a
PC in a central plant location. (You can use the PC to configure the radios
through the Radio Configuration / Diagnostic Utility.) If the plant is an oil refinery,
for example, you might decide to install radios near the oil tanks.
The next important issue is how to link the radios. Unless the radios are very
close together, you must make sure that each pair of radio antennas in the
network has a line of sight between them. In other words, you must be able to
see from one antenna to another, either with the naked eye or binoculars.
If a line of sight does not exist between antennas, you must choose a site for
installing a repeater radio, which will create a bridge between the radio antennas.
Choose the appropriate antennas for the network. If an antenna will be
connected to the radio by a long cable, you might need to purchase a power
amplifier, which is available from ProSoft Technology. The more distance
between an antenna and its radio, the more signal loss the radio will have. For
more information, see Antennas.
Consider drawing up your network plans on paper. As part of the drawing, you
should assign a logical name to each radio. You can use these names later when
configuring the radios in the Radio Configuration / Diagnostic Utility.
As part of your planning, you might want to conduct a site survey. ProSoft
Technology can perform this survey, you can do it yourself, or you can hire a
surveyor.
Protect radios from direct exposure to weather, and provide an adequate, stable
power source. Make sure that your plan complies with the radio’s power
requirements (page 82) and cable specifications (page 83).
Important: Radios and antennas must be located at least 8 inches (20 cm) away from personnel.

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1.5.1 Installation Questions
Answer the following questions to make your installation easier, and to familiarize
yourself with your system and what you want to do.
How many radios in your network?
Master ID
Repeater ID
Client ID
Locations
Is there a Line of Sight between them?
Selected the appropriate antennas for
your network?
1.6 Configuring the Radios
To configure the network radios, follow these steps.
Use the RLX-IH Browser to display all radios on the network, and then use a
Web browser or SNMP manager to view and change radio settings. The radio
package includes the program CD, power supply, Ethernet cable, and a small
antenna. You must install the antenna later, but it is not needed to get started.
IMPORTANT: If possible, you should configure all the radios side by side in an office setting and
make sure they link before you try to install them in the field.
To configure the radios in a network:
1 Start the IH Browser (page 14) configuration application.
The PC must have a wired or wireless Ethernet connection configured with a
static or dynamic IP address.
2 Plug in the Ethernet cable with PoE Injector to the RLXIB-IHW-66 radio, wait
a moment for the radio to power up, and then examine the radio's LED
display to make sure the radio is working properly.
3 Assign a temporary IP address: (page 16) Double-click the radio listing in the
RLX-IH Browser. In the next window, click OK to accept the temporary IP
address, subnet mask, and default gateway.
4 Double-click the radio listing again in the RLX-IH Browser to open the Radio
Configuration / Diagnostic Utility in your web browser. Enter "password"
(lower case, no quotes) in the next window and then click Login.
If necessary, you can enter your own password later. For information, see
Change Password (page 57).
5 Set up the master radio (page 17) first, using the Radio Settings window in
the Radio Configuration / Diagnostic Utility.

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6 Click Apply Changes to save the master radio settings.
To cancel the settings and start over, click the Cancel Changes button before
you click Apply Changes. After they are configured, master radios are
preceded by an "M" in the utility window list.
Note: The text shown in yellow at the bottom of the window indicates the status of changes you
have made to the configuration.
If the text shows "Changes not saved", click Apply Changes to save your settings.
If the text shows "Changes not saved; Will disrupt X s", you can click Apply Changes, however
the network will be disrupted temporarily while the changes are applied. The value of "X"
indicates the number of seconds the network will be offline.
7 Unplug the Ethernet cable from the radio and plug it into the next radio to be
configured.
8 Set Up a Repeater. (page 20) Return to the RLX-IH Browser. To be sure that
you are seeing the latest status of the radio(s), go to the toolbar (page 73)
and click the "Clear" icon (eraser) followed by the "Scan" icon (binoculars).
Double-click the listing of the next radio to be configured, and configure it as
a repeater radio.
9 Save the Radio Configuration. (page 19) Save the repeater radio settings by
clicking Apply Changes at the bottom of the Radio Settings screen. Repeat
steps 7 through 9 to configure each repeater in the network.
10 After configuring the network and its radios, physically label each radio.
Labeling eliminates confusion about which radios correspond with which
radio configurations in the software. You should identify the radio's name,
network SSID, and IP address, if set.
11 Install the radios and antennas (page 23).
The remainder of the topics in this section describe each of these steps in more
detail.

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1.6.1 Start IH Browser
To start IH Browser
1 Click the Start button, and then choose Programs.
2 In the Program menu, navigate to ProSoft Technology.
3 In the ProSoft Technology menu, navigate to RadioLinx.
4 Click RadioLinx IH Browser.
The window lists all the radios your computer can access. The MAC ID number is
essentially the serial number of the radio; this number is also printed on the side
of the radio. If a radio listing does not appear in the window, select Scan from the
File menu. If you still do not see a radio listing, see Troubleshooting.

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1.6.2 Plug In the Cables
You can configure the RLXIB-IHW-66 using the Ethernet port on the underside of
the radio.
If you are connecting to the radio through an Ethernet hub or switch, use the
2 gray (straight-through) cables.
If you are connecting to the radio directly from your PC without going through
an Ethernet hub or switch, you must use the red (crossover) cable and a gray
(straight-through) cable.
Note: After you plug in the Ethernet cable (which supplies both power and connectivity), the radio
performs a startup procedure that includes a self-test, loading the main program, and initializing the
radio. This startup procedure can take up to two minutes.
After the startup procedure has completed successfully, the Power/Status LED
should be green, meaning that the radio has power. The Ethernet LED should
also be green, meaning that the Ethernet connection is working. The RF
Transmit and RF Receive LEDs should blink.
For information on making connections, see Radio power requirements (page 82)
and Cable specifications (page 83).
1.6.3 Detecting the Radio
After the radio has completed its startup procedure, the radio will appear in the IH
Browser window.
The window lists all the radios your computer can access. The MAC ID number is
essentially the serial number of the radio; this number is also printed on the side
of the radio. If a radio listing does not appear in the window, select Scan from the
File menu. If you still do not see a radio listing, see Troubleshooting.
Tip: If a radio listing does not appear in the window, open the File menu and choose Scan. If you
still do not see a radio listing, refer to Diagnostics and troubleshooting in the RLXIB User Guide.

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1.6.4 Assign a Temporary IP Address
You need the IP address to log into the Radio Configuration/Diagnostic Utility
and configure the radio settings. If the radio is connected to a network with a
DHCP server, the radio may already have an IP address assigned to it.
If a DHCP server is not available, or if you prefer to assign a static IP address,
you can enter a temporary IP here. You will use the Radio Configuration /
Diagnostic Utility (page 31) to assign a permanent IP address.
To assign a temporary IP Address
1 In IH Browser, click to select the radio.
Tip: If a radio listing does not appear in the window, open the File menu and choose Scan. If you
still do not see a radio listing, refer to Diagnostics and troubleshooting in the RLXIB User Guide.
2 Open the Operations menu, and choose Assign IP. This action opens the
Assign Temporary IP Address dialog box.
3 Accept the dynamically assigned address, and then click OK.
For information, see Radio Access settings (page 55).

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1.6.5 Set Up the Master Radio
To configure the radio, double click on the radio (Radio1) in the IH Browser
window. This action opens a web browser (for example Microsoft Internet
Explorer or Firefox) and loads the IH Radio’s web configuration interface.
Important: The radio configuration is protected by a login password. The default password for the
radio is "password" (lower case, no quotes). To prevent unauthorized access to the radio
configuration, you should change the password when you have finished the initial configuration.
Note: The master is the "root" or top-level radio in a network. You must have at least one master
radio per network. For redundancy, you can assign more than one master to a network.
To configure a Master radio, make the following changes to the web
configuration form:

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Radio Network Settings
Radio Name: Enter a unique name for the radio.
Select Master as the radio mode.
Network SSID: Assign a network name (SSID) of up to 32 characters. The
radio uses this name in all network references. All radios in a network must
have the same SSID.
Channel: Select a channel and frequency range for the network or accept the
default value. Network channels allow radios to avoid sharing a frequency
with other networks in the same location. The channel list indicates the
channel number as well as the frequency (2.4 gHz or 5 gHz).
Important: The RLXIB-IHW-66 radio is supplied with a dual-band antenna that supports both
frequency ranges. If you use a different antenna with the IHW radio, you must choose a channel
and frequency range supported by the antenna.
Security Settings
Encryption Type: Encryption scrambles data so that only intended viewers
can decipher and understand it. Although "none" is an available encryption
type, ProSoft Technology strongly recommends encrypting all data sent and
received from every radio on your network, to help prevent your data from
being intercepted and decoded.
WPA phrase: To use WPA encryption on packets sent between the radios,
select WPA in the Encryption Type field. Next, in the WPA phrase field, enter
a pass phrase of between eight and 63 normal keyboard characters. This
phrase automatically generates an encryption key of 128 hexadecimal
characters. The default pass phrase is "passphrase" (lower case, no quotes).
For more information on encryption, see Security settings (page 52).
Because you must assign the same Network SSID and WPA phrase to the
repeater radios later in this procedure, you should write down the settings.
Note: Network SSID and WPA phrase are both case-sensitive.
Network SSID:_________________
WPA phrase:__________________

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Radio Access Settings
If a DHCP (Dynamic Host Control Protocol) server is configured on your local
area network, the DHCP server can assign IP addresses automatically.
If you prefer to assign a Static (Fixed) IP address, select "Use the following IP
address", and then enter the IP Address, Subnet Mask and Default Gateway in
the Radio Access Settings area of the IH Radio web configuration form.
Important: If you intend to assign IP addresses manually, you must not duplicate an IP address
that is already in use on your network. If you are not sure what IP addresses are available, ask
your network administrator for assistance.
1.6.6 Save the Radio Configuration
Before closing the Radio Configuration window, you must apply your changes.
Click Apply Changes to save your configuration and restart the radio.
Note: To discard your changes and start over, click Cancel Changes.

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1.6.7 Set Up a Repeater
To configure a radio as a Repeater, make the following changes to the web
configuration form:
Radio Network Settings
Radio Name: Enter a unique name for the radio.
Select Repeater as the radio mode.
Network SSID: Enter the SSID you configured for the Master radio. All radios
in a network must have the same SSID.
Security Settings
Encryption Type: Encryption scrambles data so that only intended viewers
can decipher and understand it. Choose the same encryption type you
configured for the Master radio.
WPA phrase: Enter the pass phrase you configured for the Master radio.
Important: The Network SSID and WPA phrase are case sensitive. Use exactly the same
combination of upper case and lower case letters you entered for the Master radio, otherwise the
Repeater radio will not be able to connect to the Master radio.
By default, a repeater connects automatically to the best available parent radio
on the network. If necessary, however, you can click the Parent Link button and
specify how repeater radios connect to the network. See Parent Link settings
(page 42) for information.