Airlink101 Redwing GPRS User manual

Copyright © 1993-2006 AirLink Communications, Inc. All rights reserved.
Redwing GPRS
User Guide
Version 2.30 - September 2006

Redwing GPRS - User Guide, version 2.30 ii
Information in this document is subject to change without notice.
©Copyright AirLink Communications, Inc., 1993-2006. All rights reserved.
WARNING
The antenna(s) used for this transmitter must be installed to provide a separation distance of at least 20 cm
from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.
Important Notice
Because of the nature of wireless communications, transmission and reception of data can never be guaranteed.
Data may be delayed, corrupted (i.e., have errors) or be totally lost. Although significant delays or losses of data
are rare when wireless devices such as the AirLink Communications modem are used in a normal manner with a
well-constructed network, the AirLink modem should not be used in situations where failure to transmit or
receive data could result in damage of any kind to the user or any other party, including but not limited to per-
sonal injury, death, or loss of property. AirLink Communications, Inc., accepts no responsibility for damages of
any kind resulting from delays or errors in data transmitted or received using the AirLink Communications
modem, or for failure of the AirLink Communications modem to transmit or receive such data.
Safety and Hazards
Do not operate the AirLink Communications modem in areas where blasting is in progress, where explosive
atmospheres may be present, near medical equipment, near life support equipment, or any equipment which
may be susceptible to any form of radio interference. In such areas, the AirLink Communications modem MUST
BE POWERED OFF. The AirLink Communications modem can transmit signals that could interfere with this equip-
ment. Do not operate the AirLink Communications modem in any aircraft, whether the aircraft is on the ground
or in flight. In aircraft, the AirLink Communications modem MUST BE POWERED OFF. When operating, the Air-
Link Communications modem can transmit signals that could interfere with various on board systems. The driver
or operator of any vehicle should not operate the AirLink Communications modem while in control of a vehicle.
Doing so will detract from the driver or operator's control and operation of that vehicle. In some states and
provinces, operating such communications devices while in control of a vehicle is an offence.
Limitation of Liability
The information in this manual is subject to change without notice and does not represent a commitment on the
part of AirLink Communications, Inc. AIRLINK COMMUNICATIONS, INC. SPECIFICALLY DISCLAIMS LIABILITY
FOR ANY AND ALL DIRECT, INDIRECT, SPECIAL, GENERAL, INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEM-
PLARY DAMAGES INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS OR REVENUE OR ANTICIPATED PROFITS
OR REVENUE ARISING OUT OF THE USE OR INABILITY TO USE ANY AIRLINK COMMUNICATIONS, INC. PROD-
UCT, EVEN IF AIRLINK COMMUNICATIONS, INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
OR THEY ARE FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY.
Warranty Summary
For the full and complete text, refer to the warranty appendix in the modem user guide or to the AirLink website
(http://www.airlink.com) for the full text of the warranty.
Software: Software is warrantied for 90 days to work in substantial conformance to applicable software specifi-
cations. AirLink’s sole obligation is to, at their option, refund the liscense fee or replace the software with other
software.
Hardware: All equipment is warrantied for one year after delivery to conform with AirLink’s specifications and be
free from manufacturing defect. Optional warranty extensions can be purchased for two and four years which
would increase the warranty period to three and five years respectively. If under normal use, the hardware
proves to have any such defect and the Customer notifies AirLink of such defect within the warranty period, Air-
Link, at its option, will either repair or replace the same without charge but only upon written authorization and
in accordance with instructions of AirLink using a Return Material Authorization ("RMA") process (details of the
process are in the full warranty statement).
THIS WARRANTY DOES NOT COVER PRODUCTS THAT DO NOT CONFORM TO SPECIFICATIONS BECAUSE OF
ACCIDENT, ALTERATIONS, FAILURE TO FOLLOW INSTRUCTIONS, USE OUTSIDE THE SCOPE OF ANY OTHER
PROVIDED DOCUMENTATION (E.G., USER GUIDE, INSTALLATION GUIDE, QUICK START GUIDE), MISUSE,
ABUSE, NEGLECT, FIRE, FLOOD OR ACTS OF GOD.

Redwing GPRS - User Guide, version 2.30 iii
Contents
Introduction to Redwing GPRS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
GPRS Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Establishing an Internet Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Using the GPRS Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
How your Redwing gets its IP Address from Your Wireless Service Provider . . . . . . . . . . . . . . 2
APN (Access Point Name) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Dynamic vs Static IP Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Common Uses for the Redwing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Activating the Redwing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Installing the SIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Opening the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ejecting the SIM tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Inserting the SIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Finishing the SIM installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hardware Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Connecting the Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Connecting power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Connecting the Redwing to a computer or other device . . . . . . . . . . . . . . . . . . . . . . . . . .9
Redwing Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Specifications for the Redwing GPRS . . . . . . . . . . . . . . . . . . . . . . . . . .10
Physical Characteristics: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Data Services & RF Features: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Environmental: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Management: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Short Message Service (SMS): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Serial Port Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Mounting Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Direct Serial Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Direct Serial Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Using AT Commands with a Terminal Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Information and Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Serial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
GPRS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Redwing GPRS - User Guide, version 2.30 iv
Contents
Windows Dial-up Networking (DUN) . . . . . . . . . . . . . . . . . . . . . . . . . .24
Installing the Modem Driver in Microsoft Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Dial-Up Networking (PPP) Configuration for Microsoft Windows . . . . . . . . . . . . . . . . .27
Making a DUN Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Warranty Terms and Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Warranty Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Standard Software Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
One Year Standard Equipment Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Optional Two Year Extended Equipment Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Optional Four Year Extended Equipment Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Warranty Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Remedy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
WARRANTY DISCLAIMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
LIMITATION OF LIABILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
General Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Frequently Asked Questions and Technical Support . . . . . . . . . . . . . .38
FAQ Topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Power, Antennas, and Signal Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
The Redwing’s IP Addresses and Local Networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Security for the Redwing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
AirLink Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
AirLink Support Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
AirLink Documentation and Guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Contacting Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Redwing GPRS - User Guide, version 2.30 1
CHAPTER 1 Introduction to Redwing GPRS
The Redwing's rugged form factor is ideal for industrial and commercial applications that require
real-time communications. The Redwing provides cellular data communications for a variety of
applications, such as telemetry, public safety, SCADA, traffic control, traffic metering, transit
arrival systems and more.
FIGURE 1. Redwing front and back
GPRS Overview
Establishing an Internet Connection
The Internet Service Provider (ISP) from you to the Internet is Your Wireless Service Provider with
your Redwing as the connection to Your Wireless Service Provider.
General Packet Radio Service (GPRS) is packet-switched with many users sharing the same
transmission channel, but only transmitting when they have data to send. This means that the total
available bandwidth can be immediately dedicated to those users who are actually sending at any
given moment, providing higher utilization where users only send or receive data intermittently.
GPRS provides speeds of 30–70 kbps with bursts up to 170 kbps.

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Introduction to Redwing GPRS
Steps of a connection:
Using the GPRS Network
As stated above, when your Redwing registers on the Your Wireless Service Provider network, it
receives an IP address. There are two types of addresses on networks: dynamic and static.
•Dynamic addresses are assigned on a “need to have” basis. Your Redwing might not always
receive the same address each time it connects with Your Wireless Service Provider.
•Static addresses are permanently assigned to a particular account and will always be used
whenever your Redwing connects to the Internet. The IP address will not be given to anyone
else.
How your Redwing gets its IP Address from Your Wireless Service Provider
1. When your Redwing is powered on, it automatically searches for cellular service using GPRS.
2. Your Redwing establishes a PPP (Point to Point Protocol or “dial” up connection) link to Your
Wireless Service Provider’s network, also called registering on the network, and receives an IP
address from Your Wireless Service Provider.
3. When your Redwing has received the IP address from Your Wireless Service Provider, then it
is ready to allow communication to the cellular network.
To use your Redwing’s serial port to connect to the Internet from your computer, you need to con-
nect the computer directly to the Redwing’s serial port and use Dial-Up Networking (DUN).
FIGURE 2. Using the Redwing to connect to the Internet
The APN (Access Point Name) defines the network that is accessible with your .
APN (Access Point Name)
Internet
GPRS

Redwing GPRS - User Guide, version 2.30 3
Introduction to Redwing GPRS
Private network connections are unique for each configuration and not covered as part of the stan-
dard installation.
Dynamic vs Static IP Addresses
If you need to contact the Redwing, a device connected to the modem, or a host system using the
Redwing from the Internet, you need to have a known IP (such as one which is static) or domain
name (an IP address which is converted by a DNS server into a word based name).
Most ISPs (cellular included) use dynamic IP addresses rather than static IP addresses since it
allows them to reuse a smaller number of IP addresses for a large number of customers. A
dynamic IP address is suitable for many common Internet uses, such as web browsing, looking up
data on another computer system, or other client functions (such as data only being sent out or only
being received after an initial request).
Common Uses for the Redwing
With GPRS, you can choose a type of Access Point which most suits your needs. Your Wireless
Service Provider can set up your account so you are able to have a Private IP address, a Public IP
address, a static IP address, or even a custom IP address which essentially extends your com-
pany's local area network to include the Your Wireless Service Provider network. The Access
Point is the link to the type of network with the Access Point Name (APN) as the gateway. It sets
up the DNS and other configurations needed to communicate on that network.
For most accounts, the default “Internet APN” is the connection you will need and want to config-
ure for your . Contact Your Wireless Service Provider to find out if your account is set up differ-
ently or uses a different APN.
Note: If you have a dynamic IP address for your Redwing, you will not be able to
contact the modem using a name.
Caution: The IP address given to your Redwing by Your Wireless Service Provider
must be Internet routable if you do not have a direct connection to the Your Wire-
less Service Provider's network (example, using frame relay).
The Redwing’s rugged construction and cellular connection make it ideal for use in remote and/or
industrial locations.
The Redwing is designed to work with legacy devices which do not need the advanced features of
ALEOS.

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Introduction to Redwing GPRS
FIGURE 3. Remote Internet Access

Redwing GPRS - User Guide, version 2.30 5
CHAPTER 2 Activating the Redwing
The SIM (Subscriber Identity Module) card in the Redwing is a smartcard securely storing the key
identifying a mobile subscriber. Generally, you will only need to install the SIM once in the life of
the modem and it may be pre-installed by AirLink.
Installing the SIM
To install the SIM, you will only need a small phillips head screw driver.
a. Unplug the Redwing’s power and all cables.
b. Using a small phillips head screw driver, remove the screws on the back of the Redwing.
c. Slide the casing off of the Redwing and set it aside.
Note: If the SIM card was pre-installed by AirLink, unless you need to set a custom
APN, there is nothing more you need to do, activation of your modem is complete.
1. Opening the Case
FIGURE 1. Redwing back
2. Ejecting the SIM tray

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Activating the Redwing
b. Slide the tray out of the slot.
FIGURE 3. Empty SIM Tray
a. Place the SIM into the tray and gently press to click it into place.
FIGURE 4. SIM Tray with a SIM
b. Slide the tray back into the modem and gently press to click it into place.
a. Using the tip of a PDA stylus, an unbent paperclip, or other slim blunt item press the yellow
button of the SIM tray. On the Redwing, the button is on the bottom of the main board.
FIGURE 2. Tray button: Redwing
3. Inserting the SIM
The SIM may be a different color than this
example.
Note: The top of the card faces the the bottom of the modem.

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Activating the Redwing
a. Slide the Redwing back into the case.
b. Secure the back of the Redwing with the screws.
FIGURE 5. Inserting the SIM: Redwing
4. Finishing the SIM installation

Redwing GPRS - User Guide, version 2.30 8
CHAPTER 3 Hardware Installation
Your AirLink Redwing should be mounted in a position that allows easy access for the cables so
they are not bent or constricted. The LEDs on the front panel should be visible for ease of opera-
tional verification. You should ensure that there is adequate airflow around the modem but that it is
kept free from direct exposure to the elements (sun, rain, etc.)
An optional accessory for your modem is a mounting kit. The bracket is designed to snugly cra-
dle the modem and hold it in place where you need it. See “Mounting Kit” on page 12.
Modem placement with grounding information and diagrams can be found in the
Appendix, “Modem Placement” on page 56.
Connecting the Antenna
Antennas selected should not exceed a maximum gain of 5 dBi under standard installation config-
uration. In more complex installations (such as those requiring long lengths of cable and/or multi-
ple connections), it’s imperative that the installer follow maximum dBi gain guidelines in
accordance with the FFC’s, Industry Canada’s, or your country’s radio communications regula-
tory body’s regulations.
Your AirLink Redwing will work with most Dual-Band PCS cellular antennas with a TNC con-
nector that works in the high and low frequencies of GPRS . Connect the antenna or RF cable
directly to the TNC connector on the back of the Redwing.
FIGURE 1. Redwing connecters
Connecting power

Redwing GPRS - User Guide, version 2.30 9
Hardware Installation
Your Redwing can be used with either DC (available in most automobiles) or 110 AC (standard
US wall power) with the appropriate power adapter (available from AirLink).
The power cable positive lead should be connected to the battery or power source positive termi-
nal. The power cable negative lead should be connected to the battery or power source negative ter-
minal. The Redwing has an internal polysilicon circuit breaker that opens at 0.5 to 1.0 amps of
current.
When your Redwing is connected to power and an antenna, there is a specific pattern to the lights
to indicate its operation mode.
Note: When using a DC power source (such as a car battery or solar cell), AirLink
recommends placing a fuse on the line close to the power source to protect your
power source from possible surges due to shorts or other line issues.
Connecting the Redwing to a computer or other device
Your Redwing’s serial port can be connected directly to most computers or other devices using a
standard straight through cable. If you have a DCE device, you will need a null modem or null
modem cable.
Your Redwing can also be connected to a USB to serial device connected to a computer or other
device which does not have an available serial port but does have USB.
Redwing Indicator Lights
FIGURE 2. Redwing indicator lights
Net (network) - Indicates when there is traffic on the network.
Pwr (power) -Indicates the power adapter is connected and there is power getting to the modem.
The Reset button performs the same function as unplugging power from the modem and plugging
it back in. Reset will not alter any saved configuration settings.

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APPENDIX 1 Specifications for the Redwing GPRS
Data Services & RF Features:
•Network: 1900/850 MHz GPRS
•Transmit frequency: 1850-1910 MHz and 824-849 MHz
•Transmit power range at antenna port: 1.0 W for 1900 MHz and 0.8W for 850 MHz
•Transmitter can reduce output power when near a base station as per GSM specifications
•Receiver frequency: 1930-1990 MHz and 869-894 MHz
•Receiver sensitivity: typical -107 dBm (2.439% bit error rate)
•Multislot Class 8
•Circuit Switched Data Capable (14,400 Transparent and Non-Transparent Modes)
Environmental:
•Operating ranges: -30°C to +70°C
•Humidity: 5%-95% Non-condensing
Power Management:
•Low power consumption
•Dormant connection (idle for 10-20 seconds): 20 mA at 12 VDC
•Input Voltage: 10 VDC to 28 VDC
•Input Current: 20 mA to 350 mA
•Typical Receive: 120mA at 12VDC
•Typical Transmit: Approximately 120 mA at 12VDC
Physical Characteristics:
•Weight: < 1 lb .
•Size: 3” x 1.1” x 5.1"
•RF Antenna Connector: 50 Ohm TNC
•Serial Interface: RS232 DB-9F with 1200-115200 bps

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Specifications for the Redwing GPRS
Power consumption
Short Message Service (SMS):
•Send and Receive
•Notification of new messages
Modem Idle Transmitting
Redwing 50 mAh 200-300 mAh
Serial Port Pinouts
The cable between the Redwing and a computer or other serial device needs to be wired straight-
through (pin 1 goes to pin 1, pin 2 to pin 2, etc.). If your end device connected to the Redwing is a
DCE device, you will need a null-modem cable.
FIGURE 1. Serial Port Diagram : Female DB-9 DCE (not to scale)
5
4
3
2
1
9
8
7
6
< - > GND (Ground)
< - DTR Data Terminal Ready)
< - Rx (Receive)
- > Tx (Transmit)
- > DCD (Data Carrier Detect)
Unused
CTS (Clear to Send) < -
RTS (Request to Send) - >
DSR (Data to Send) < -

Redwing GPRS - User Guide, version 2.30 12
APPENDIX 2 Mounting Kit
An optional accessory for your modem is a mounting kit. The bracket is designed to snugly cradle
the modem and hold it in place where you need it.
The Redwing “snaps” into place in the bracket locking into the grooves on the Redwing case. The
bracket can be further secured with a twist-tie set into the grooves on the top for situations where
the Redwing may be subjected to violent movement, such as in the back of an automobile. In most
stationary installations, such as in a field or pipe, the Redwing and bracket shouldn’t require a
twist-tie.
The bracket can be attached to the location using #6 screws (mounting hole diameter approximately
0.150").
FIGURE 1. Mounting Bracket

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Mounting Kit
FIGURE 2. Redwing Mounting Bracket, part number 100-170-1009 A

Redwing GPRS - User Guide, version 2.30 14
APPENDIX 2 AT Commands
Direct Serial Connection
Using HyperTerminal, included with most installations of Microsoft Windows:
Start>All Programs>Accessories>Communications>HyperTerminal
1. Choose a name for your connection, such as Redwing or AirLink (if you want to have a con-
nection saved for both local and remote, it is recommended the connection name reflect the con-
nection type, i.e. Redwing local). The name and icon are only for your own reference so you can
find the connection at a later date.
FIGURE 1. HyperTerminal: Connection Name
2. Select COM1 (or the comport to which the modem is connected) for the Connect Using.
FIGURE 2. HyperTerminal: Comport Setting
3. Change the Bits per Second to 115200 (default), Data Bits to 8, Parity to None, Stop Bits to 1,
and Flow Control to Hardware.
Just as with a Hayes compatible analog modem, the Redwing parameters can all be configured
with AT commands.
Direct Serial Connection

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AT Commands
FIGURE 3. HyperTerminal: Comport Settings
4. Type AT and press Enter. You should get a reply of “OK” or “0”. .
5. To see what you are typing as you type it, you will need to turn on the echo and verbose mode.
Type ATE1V1 and press Enter.
6. If you get a reply of “OK”, then you entered the command successfully. If you get a reply of
“0” or “ERROR”, try entering the command again.
Using AT Commands with a Terminal Application
•The following pages list the AT commands, their parameters, and explain what they do. For
most commands, when you are entering them using a terminal connection, you will need to
preface the command with AT (exceptions are noted), i.e. ATA which listed as A
•Some commands have specific parameters while other commands will take whatever you type.
•Acceptable parameters and/or specific formats are in the parameters column.
•Required variable parameters are denoted with italicized text, example, Dn. The nis variable
and noted in the parameters column.
•Optional parameters are denoted with square brackets [ ].
•Most commands with parameters can be entered with ?to read the current value (for example,
AT&D? will respond with “2” if the default has not been changed).
•AT Commands are not case sensitive. A capital “E” is the same as a lower-case “e”.
•When you are using a terminal connection, if you enter a command which is recognized by the
Redwing, it will respond with “OK”. If the command is not recognized, the response will be
“ERROR”.
•Those commands applicable only to certain model numbers of the Redwing will be noted.
•The commands are alphabetical within their groups.
Note: If you have configured the Redwing for settings different than the defaults
for Bits per Second, Data Bits, Parity, and/or Stop Bits, you will need to use your
changed settings.
Caution: Symbols listed with commands, such as /, &, or ?, are part of the com-
mand and must be included.

Redwing GPRS - User Guide, version 2.30 16
AT Commands
AT Command Listing
Symbols
&C . . . . . . . . . . . . .21
&D . . . . . . . . . . . . .21
&F . . . . . . . . . . . . .22
&S . . . . . . . . . . . . .22
&V . . . . . . . . . . . . .17
&W . . . . . . . . . . . . .22
*NETAPN . . . . . . . . .23
+++ . . . . . . . . . . . .18
+CCID . . . . . . . . . .17
+CGDCONT . . . . . . .23
+CGQMIN . . . . . . . .23
+CGQREQ . . . . . . . .23
+CIMI . . . . . . . . . . .17
+COPS . . . . . . . . . .23
+CSQ . . . . . . . . . . .17
+CSSN . . . . . . . . . .17
+ICCID . . . . . . . . . .17
+RCIQ . . . . . . . . . .17
+WHWV . . . . . . . . .17
+WSSW . . . . . . . . .17
A
A. . . . . . . . . . . . . .18
A/ . . . . . . . . . . . . . .18
D
D. . . . . . . . . . . . . .18
E
E. . . . . . . . . . . . . .19
H
H. . . . . . . . . . . . . .19
II. . . . . . . . . . . . . . .17
O
O. . . . . . . . . . . . . .19
Q
Q. . . . . . . . . . . . . .19
S
S10 . . . . . . . . . . . . .20
S23 . . . . . . . . . . . . .20
S3 . . . . . . . . . . . . .19
S4 . . . . . . . . . . . . .19
S5 . . . . . . . . . . . . .19
S53 . . . . . . . . . . . . .20
S6 . . . . . . . . . . . . .19
S8 . . . . . . . . . . . . .20
S9 . . . . . . . . . . . . .20
V
V. . . . . . . . . . . . . .21
X
X. . . . . . . . . . . . . .21
Z
Z. . . . . . . . . . . . . .21