Multitech MTCBA-C User manual

MultiModem®CDMA
Wireless Modem
MTCBA-C
User Guide

Copyright and Technical Support
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 2
MultiModem® CDMA User Guide
Wireless Modem
MTCBA-C
S000303L, Revision L
Copyright
This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-
Tech Systems, Inc. All rights reserved.
Copyright © 2003-8 by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representation or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for any particular purpose.
Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to
time in the content hereof without obligation of Multi-Tech Systems, Inc., to notify any person or organization of such
revisions or changes. Check Multi-Tech’s Web site for current versions of our product documentation.
Revision History
Revision Date Description
A 07/15/03
Initial Release
B 09/17/03 Revised package contents list & powering drawing.
C 01/20/04 Revised package contents. Added RS232 Connector pinout diagram.
D 04/12/04 Revised package contents and features lists.
E 07/13/04 Relabeled table for average transmit values, revised network access information, and added
note about Sprint network signal strength.
F 01/07/05 Added instructions for hazardous locations.
G 09/15/05 Added WEEE update, changed temperature, added humidity, changed modem maintenance,
added new warranty.
H 05/01/06 Added fuse replacement information for fused DC power cable.
I 06/28/06 Added AT command examples. Reorganized chapters.
J 04/24/07 Updated the Technical Support contact list. Removed the Multi-Tech Certified National
Activation Agent statement. Updated the Multi-Tech Warranty statement.
K 12/04/07 Updated the Hazardous Location text. Changed the Technical Support list. Revised the
Package Contents. Removed general Marketing material.
L 11/10/08 Remove fax requirements and minor editorial changes.
Trademarks and Logos
The Multi-Tech logo and MultiModem are registered trademarks of Multi-Tech Systems, Inc. Windows is a registered
trademark of Microsoft in the U.S. and other countries. Other trademarked products and registered trademarked
products mentioned in this publication belong to their respective owners.
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
Phone: [phone] or 800-328-9717
Fax: [phone]
Internet Address: http://www.multitech.com
Technical Support
Country By Email By Phone
Europe, Middle East, Africa: suppor[email protected] +(44) 118 959 7774
U.S., Canada, all others: [e-mail] 800-972-2439 or 763-717-5863
Warranty
Warranty information can be found at: http://www.multitech.com

Table of Contents
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 3
Contents
Chapter 1 – Product Description and Specifications................................................................................................4
Product Description.................................................................................................................................................4
Safety......................................................................................................................................................................5
General Safety.................................................................................................................................................5
RF Interference Issues.....................................................................................................................................5
Installation Instructions for Hazardous Locations.............................................................................................5
Vehicle Safety..................................................................................................................................................5
Maintenance of Your Modem...........................................................................................................................6
Your Responsibility..........................................................................................................................................6
Package Contents............................................................................................................................................6
Specifications..........................................................................................................................................................7
Functions – CDMA Modes......................................................................................................................................8
Electrical Characteristics.........................................................................................................................................8
Antenna/RF Specifications......................................................................................................................................9
Interfaces................................................................................................................................................................9
LEDs.......................................................................................................................................................................9
RS232 15-Pin Connector Pinout...........................................................................................................................10
AT Command Information.....................................................................................................................................10
Chapter 2 – Activation and Installation....................................................................................................................11
Activate Your Wireless Account............................................................................................................................11
Hook up the Antenna, Serial Cable, and Power....................................................................................................11
Optional – Attach the Modem to a Flat Surface ....................................................................................................12
Install the Modem Driver.......................................................................................................................................13
Chapter 3 – Using Your Wireless Modem ................................................................................................................18
Phone Numbers for the Wireless Modem .............................................................................................................18
Examples of Useful AT Commands ......................................................................................................................18
Verifying Signal Strength ...............................................................................................................................18
Checking Network Registration and Roaming Status.....................................................................................18
Checking the Modem’s Identity......................................................................................................................18
Establishing a Voice Call ...............................................................................................................................19
Establishing a Circuit-Switched Data (CSD) Connection ...............................................................................19
Answering a Circuit-Switched Data (CSD) Connection..................................................................................19
Using Short Message Services (SMS)..................................................................................................................20
SMS Examples ..............................................................................................................................................21
Internet Access.....................................................................................................................................................22
Connecting to the CDMA Network for Internet Access ..................................................................................22
Mobile PhoneTools ...............................................................................................................................................23
Chapter 4 – Troubleshooting and Frequently Asked Questions............................................................................24
Troubleshooting Examples....................................................................................................................................24
Situation A: The modem does not respond through the serial link.................................................................24
Frequently Asked Questions.................................................................................................................................24
Appendix A - Cables ..................................................................................................................................................27
Data Cable Diagram – No Voice....................................................................................................................27
Data Cable Diagram – with Voice..................................................................................................................28
Fused DC Power Cable Dimensions..............................................................................................................28
How to Change the Fuse ...............................................................................................................................28
Appendix B - Waste Electrical and Electronic Equipment (WEEE) Statement .....................................................29

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 4
Chapter 1 – Product Description
and Specifications
Product Description
The Multi-Tech MultiModem® CDMA is an external data/fax/voice wireless modem. It also supports mobile originated
short message service (SMS) and mobile-terminated SMS. It offers standards-based multi-band CDMA2000 1xRTT
performance. This ready-to-deploy, standalone modem allows developers to add wireless communication to products
with a minimum of development time and expense. The MultiModem CDMA Wireless Modem is based on industry-
standard open interfaces, is fully type approved and can be desktop or panel mounted.
Models:
MTCBA-C-N1 is a generic 800/1900 MHz CDMA modem that must be programmed with Provisioning Information
(PRI) and a Preferred Roaming List (PRL). (A-key = Random) (USB). Recommended for developers.
MTCBA-C-N2 is an 800/1900 MHz CDMA modem provisioned for Sprint networks (USB). USA
MTCBA-C-N3 is an 800/1900 MHz CDMA modem provisioned for Verizon networks (USB). USA
MTCBA-C-N4 is an 800 MHz CDMA modem with R-UIM support. (USB).
MTCBA-C-N9 is a generic 800/1900 MHz CDMA modem must be programmed with Provisioning Information (PRI)
and a Preferred Roaming List (PRL). (A-key = 0). (USB). Recommended for developers.
MTCBA-C-N11 is an 800/1900 MHz CDMA modem with R-UIM support (RS-232).
MTCBA-C-N12 is an 800/1900 MHz CDMA modem provisioned for Bell Mobility (RS-232). Canada.
MTCBA-C-N14 is an 800/1900 MHz CDMA modem provisioned for Alltel networks (RS-232). USA.
Other Product Codes:
NAM is the model for US and Canada
E/U is the model for Europe and the rest of the world

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 5
Safety
General Safety
The modem is designed for and intended to be used in fixed and mobile applications. “Fixed” means that the device is
physically secured at one location and is not able to be easily moved to another location. “Mobile” means that the
device is designed to be used in other than fixed locations.
Caution: Maintain a separation distance of at least 20 cm (8 inches) is normally maintained
between the transmitter’s antenna and the body of the user or nearby persons. The Modem
is not designed for or intended to be used in portable applications within 20 cm. (8 inches) of
the body of the user.
RF Interference Issues
It is important to follow any special regulations regarding the use of radio equipment due in particular to the possibility
of radio frequency, RF, interference. Please follow the safety advice given below carefully.
•Switch OFF your Wireless MultiModem when in an aircraft. The use of cellular telephones in an aircraft may
endanger the operation of the aircraft, disrupt the cellular network and is illegal. Failure to observe this
instruction may lead to suspension or denial of cellular telephone services to the offender, or legal action or
both.
•Switch OFF your Wireless MultiModem when around gasoline or diesel-fuel pumps and before filling your
vehicle with fuel.
•Switch OFF your Wireless MultiModem in hospitals and any other place where medical equipment may be in
use.
•Respect restrictions on the use of radio equipment in fuel depots, chemical plants or where blasting operations
are in progress.
•There may be a hazard associated with the operation of your Wireless MultiModem close to inadequately
protected personal medical devices such as hearing aids and pacemakers. Consult the manufacturers of the
medical device to determine if it is adequately protected.
•Operation of your Wireless MultiModem close to other electronic equipment may also cause interference if the
equipment is inadequately protected. Observe any warning signs and manufacturers’ recommendations.
Installation Instructions for Hazardous Locations
1. The modems are open devices intended for installation in an ultimate enclosure suitable for the intended
application.
2. THIS EQUIPMENT IS SUITABLE FOR USE IN CLASS I, DIVISION 2, GROUPS A, B, C, AND D OR NON-
HAZARDOUS LOCATIONS ONLY.
3. “WARNING – Explosion Hazard – Substitution of Components may Impair Suitability for Class I, Division 2”.
4. “WARNING – Explosion Hazard – Do not Disconnect Equipment Unless Power has been switched off or the
area is known to be Non-hazardous”.
5. “WARNING – Explosion Hazard – Do not replace fuse unless power has been switched off or the area is
known to be non-hazardous”
6. “WARNING – Do not install or remove SIM card unless power has been switched off or the area is known to
be non-hazardous”.
Vehicle Safety
•Do not use your MultiModem while driving.
•Respect national regulations on the use of cellular telephones in vehicles. Road safety always comes first.
•If incorrectly installed in a vehicle, the operation of Wireless MultiModem telephone could interfere with the
correct functioning of vehicle electronics. To avoid such problems, be sure that qualified personnel have
performed the installation. Verification of the protection of vehicle electronics should be part of the installation.
•The use of an alert device to operate a vehicle’s lights or horn on public roads is not permitted.

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 6
Maintenance of Your Modem
Your Wireless MultiModem is the product of advanced engineering, design, and craftsmanship and should be treated
with care. The suggestions below will help you to enjoy this product for many years.
•Do not expose the Wireless MultiModem to any extreme environment where the temperature is above 50ºC or
humidity is above 90% noncondensing.
•Do not attempt to disassemble the Wireless MultiModem. There are no user serviceable parts inside.
•Do not expose the Wireless MultiModem to water, rain, or spilled beverages. It is not waterproof.
•Do not place the Wireless MultiModem alongside computer discs, credit or travel cards, or other magnetic
media. The phone may affect the information contained on discs or cards.
•The use of accessories not authorized by Multi-Tech or not compliant with Multi-Tech's accessory
specifications may invalidate the warranty of the Wireless MultiModem.
•In the unlikely event of a fault in the Wireless MultiModem, contact Multi-Tech Tech Support.
Your Responsibility
This Wireless MultiModem is your responsibility. Please treat it with care respecting all local regulations. It is not a toy.
Therefore, keep it in a safe place at all times and out of the reach of children.
Try to remember your Unlock and PIN codes. Become familiar with and use the security features to block
unauthorized use and theft.
Package Contents
Unbundled Package:
Modem and No Accessories Bundled Package: Modem and Accessories
1 modem
1 mounting bracket
1 fused DC power cable
1 Quick Start Guide
1 MultiModem CD
Note: You must supply bracket screws
and an antenna.
1 modem
1 mounting bracket
1 antenna
1 serial cable
1 power supply (type depends on regional in which it will be used)
4 rubber feet for flat surface mounting
1 Quick Start Guide
1 MultiModem CD
Note: You must supply bracket screws.

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 7
Specifications
General Specifications
Standards CDMA2000 1xRTT operation
Band, Frequency Dual-band 800/1900 MHz CDMA;
800 MHz or 800/1900 MHZ with R-UIM support
Packet Data Up to 153K bps forward and reverse
Circuit Switched Data CDMA IS-95-A, IS-95B up to 14.4K bps
Power Requirements 5 V to 32VDC
Mechanical Dimensions & Weight 4.3" L x 2.4" W x 0.94" H; 4.2 oz.
(11 cm x 6.1 cm x 2.4 cm; 119 g)
Connectors & Fasteners Antenna Connection type: SMA jack
Serial Connector: 15-pin RS232 SUB D female (DE15S)
Pins: RS232 link, audio link, RESET
Power Connector: 2.5mm miniature power jack
Operating Temperatures -30° to +70°C
Storage Temperatures -40° to +85°C
Humidity Relative humidity 20% to 90% noncondensing
Features Desktop or panel mounting
Short Message Service features including SMS mobile originated, SMS
mobile terminated, cell broadcast, Over the Air Activation (OTA),
OTASP, OTAPA
Voice features include DTMF, telephony, OCELP 13K, echo cancellation
AT command compatible
Phone book management and Personal Information Management (PIM)
Fixed dialing number
Supplementary services including call forwarding, call barring, multiparty,
call waiting and call hold, calling line identification, closed user group,
call transfer
Numerous LEDs present operational status
Real time clock
Alarm management
Certifications EMC: FCC Part 2, 15, 22, 24, EN 55022, EN 55024
Safety: cUL, UL 60950, EN 60950
Network: CDG 1 & 2

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 8
Functions – CDMA Modes
Mode Description
Standard Dual Band 800/1900 MHz CDMA
Interface Serial interface RS232. V.24/V.28 Autobauding function. AT command set based on
TIA/EIA/IS707.3, V.25ter and GSM 07.05 & 07.07
SMS Mobile Originated (MO) and Mobile Terminated (MT), Over the Air Activation (OTA), OTASP,
and OTAPA
Data Asynchronous 2400, 4800, 9600, and 14400 bps.
Transparent and Non-Transparent modes.
Mode 3.1 KHz (PSTN) and V110 (ISDN).
Fax [phone]/9600 bps
Class 2.0 Group 3 compatible.
Electrical Characteristics
Electrical Characteristics
Switching the modem on/off The device is permanently powered (when connected to the power supply).
Voltage Range Voltage range : 5 to 32V DC
GND: 0V
Over voltage and Under voltage Correct operation of the Wireless MultiModem in communication mode is
not guaranteed if input voltage falls below 5V.
Input/output electrical characteristics for external connections
Parameters 800 MHZ 1900 MHZ Unit
Typ. Typ.
Input Supply Voltage 5 13.2 32 5 13.2 32 V
Input supply current in comm. mode at full Tx
power 600 230 100 650 240 100 mA
Input supply current in comm. mode at average
Tx power 240 100 50 250 100 50 mA
Input supply current in idle mode 50 20 20 50 20 20 mA

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 9
Antenna/RF Specifications
CDMA 800 CDMA 1900
Frequency 824 to 894 MHz 1850 to 1990 MHz
Impedance 50 ohms
VSWR <2
Typical Radiated Gain 0 dBi on azimuth plane
Interfaces
The Wireless MultiModem has several interfaces:
LED function indicating operating status
External antenna (via SMA connector)
Serial and control link (via 15 pins SUB D)
Power supply (via 2.5mm miniature power jack)
LEDs LED Indicators
TD Transmit Data. Light is on when modem is transmitting data.
RD Receive Data. Light is on when modem is receiving data.
CD Carrier Detect. Light is on when data connection has been established.
LS Line Status.
Continuous “on” state indicates that the wireless modem is not registered on the network.
Flashing state indicates registration on network.
Off state. Modem is off (not ready) or in download mode.
TR Terminal Ready. Commonly called “Data Terminal Ready.” This is a readiness signal from the PC.
PWR Power. Light is on continuously to when power on. (On the IP model, this LED flashes when power is
on.

Chapter 1 – Product Description and Specifications
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 10
RS232 15-Pin Connector Pinout
10 11
6
15
15
PIN EIA CCIT Designation
RS-232 1 DCD 109 Data Carrier Direct
6 RX 104 Receive Data (out)
2 TX 103 Transmit Data
8 DTR 108.2 Data Terminal Ready
9 GND Signal Ground
7 DSR 107 Data Set Ready
12 RTS 105 Request to Send
11 CTS 106 Clear to Send
13 RI 125 Ring Indicator
Audio 4 MICROPHONE (+)
5 MICROPHONE (-)
10 SPEAKER (+)
15 SPEAKER (-)
Boot 3 BOOT For factory use only.
Reset 14 RESET To reset, connect to GND momentarily (typical:
20mSec). Open for normal operation.
AT Command Information
AT commands for the CDMA wireless modem are published in a separate Reference Guide included on the
MultiModem CD and posted on the Multi-Tech web site.
IP commands for CDMA modems are also published in a separate Reference Guide included on the MultiModem
CD and posted on the Multi-Tech web site.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 11
Chapter 2 – Activation and
Installation
Activate Your Wireless Account
Pre-Configured Multi-Tech Products
Each Multi-Tech wireless product has been pre-configured to operate on a wireless network. However, Multi-
Tech offers some models that are not pre-configured.
Activate Your Wireless Account
Please see the wireless account Activation Notices located on the MultiModem CD. Choose the one for your
wireless network provider and follow the directions to activate your account.
Phone Numbers for the Wireless Modem
Every wireless modem will have its own unique phone number. The phone number will be given to you by your
wireless service provider. Wireless provider implementations may vary.
Hook up the Antenna, Serial Cable, and
Power
1. Connect a suitable antenna to the SMA connector (see antenna specifications on page 9).
2. Connect both sides of the serial and control cable (15-pin Sub D connector on the modem side).
3. Plug the power supply cable into the modem.
For two-piece transformer power supply (International).
•Connect the AC cord receptacle into the transformer block.
•Connect the AC cord plug into the power outlet.
For one-piece transformer power supply (North America).
•Connect between the MultiModem power receptacle and the power outlet.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 12
For optional direct-DC powering.
•Connect the direct-DC power supply cable into the DC power source on the vehicle or machine in
which you are mounting the modem. Be sure the GND connection is correct.
•Connect red wire to + (positive) and black wire to – (negative).
Note: Units shipped with the universal AC power supply are not suited for installation in hazardous
locations.
Note: For automotive application: according to the type of application, you can use permanent “+” or key-
switched “+”. Connect the power supply to its source (for example, in a mobile situation, to the
vehicle’s DC fuse/terminal block).
Warning
Over-voltage protection is provided on the device. To ensure complete protection, you
may want to add additional filtering to the DC input
Optional – Attach the Modem to a Flat
Surface
To mount the Wireless MultiModem, do the following:
1. Obtain mounting screws (two are needed) that are appropriate for the surface on which you will mount the
modem. For example, one might use two 6-32 self-tapping screws 5/8” in length to mount the unit in a
truck to the wall of the cab behind the passenger’s seat.
2. Typically, the unit is mounted against a flat surface into which holes can be drilled. The mounting holes
(center-to-center) must be separated by 125mm or 4 -15/16 inches.
Drill the mounting holes at the desired mounting location.
3. Slide the mounting bridle into the corresponding slots on the backside of the modem chassis.
4. Attach the modem with two screws to the mounting surface at the desired location on the equipment.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 13
Install the Modem Driver
Introduction
Compatibility: The wireless modem is compatible with Windows Vista, XP, 2003, 2000, and Linux.
Windows: Windows operating systems require a modem driver to be installed in your computer’s program
directory. The Windows driver is located on your MultiModem product CD. Refer to the example below for
installing the Windows driver onto your PC.
Linux: Linux does not require a driver for serial modems.
Requirements
•One MTCBA-C modem
•A RS-232 cable to connect the modem to the PC
•The MultiModem CD that was shipped with the Multi-Tech modem
•A PC running Windows
Note: This installation procedure is only used as a basic guide to help you install the Multi-Tech Wireless modem
driver. You may see differences in your setup based upon your version of Windows and your Windows settings.
Installing the MultiModem Driver onto a PC Running Windows Vista/XP/2003
This installation assumes a Windows Vista, XP or 2003 operating system. XP and 2003 are identical in the methods
they use for installing modem drivers.
To load the MultiModem wireless modem’s driver on your PC, select the Control Panel’s Phone and Modem Options
option. During this installation, you will be required to browse the MultiModem CD to load the modem’s INF file. This
file is located at the root directory on the MultiModem CD.
1. Go to Start, and then click on Control Panel.
2. In the Control Panel, double-click on Phone and Modem Options.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 14
3. When the Phone and Modem Options screen appears, click on the tab labeled Modems.
Click on Add to add a new modem.
4. On the Install New Modem screen
click Don’t detect my modem, I will select it from a list. Then click Next >.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 15
5. On the next screen
Click the Have Disk button to browse for the driver file on the MultiModem CD.
6. Make sure that the MultiModem CD is inserted into your CD-ROM,
7. Browse to your MultiModem CD
Select Drivers/Windows Drivers/Vista 32 or 64 or XP 32 or 64 depending on your Windows operating
system and then select MTSWireless file.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 16
8. On this next screen, scroll down the list of modems and select the model that is applicable to your modem.
Once you have selected your model, click on Next>.
9. You will now have to choose which com port the MultiModem is connected to.
If you know exactly which port your modem is on, click on that port; other wise, choose COM1 (most
common). Click Next >.

Chapter 2 – Activation and Installation
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 17
10. To finish the install, click on Finish.
You have now successfully installed the MultiModem driver to your PC.
Verifying That Your Modem Has Been Installed Successfully
1. After you have successfully installed the Multi-Tech modem driver as stated above, you should be brought
back to the Phone and Modems Options screen. Make sure that the modem is now listed under the columns
Modem and Attached To (the correct com port).
2. Highlight the modem and then click Properties.
3. A Properties screen will open for the Multi-Tech modem. Click on the tab labeled Diagnostics.
4. In the middle of the screen, click on the Query Modem button. Windows will now try to query the Multi-Tech
modem. If this process passes, the second box on this screen will show the columns Command and
Response.
Note: To make sure that the modem is correctly being queried, look at the LED lights of the modem after
you click on Query Modem. The TR light should come on and the TD and RD lights should flicker.
5. If this process passes, then the modem should be properly installed and ready for use. Click OK to close the
modem Properties window. Then click on OK to close the Phone and Modem Options window.

Chapter 3 – Using Your Wireless Modem
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 18
Chapter 3 – Using Your Wireless
Modem
Phone Numbers for the Wireless Modem
•Every wireless modem will have its own unique phone number.
•The phone number will be given to you by your wireless service provider. Wireless provider implementations
may vary.
Examples of Useful AT Commands
A Note About HyperTerminal
In order to verify signal strength and roaming status, you must use a terminal application such as HyperTerminal. To
open this program in Windows XP or Windows 2003, go to Start > All Programs > Accessories > Communications
> HyperTerminal. Other Windows operating systems have similar paths to HyperTerminal. See your system’s online
Help if you cannot find it.
A Note About AT Commands
CDMA commands is included on the MultiModem CD and on the Multi-Tech Web site.
The following two commands let you query signal strength and roaming status.
Verifying Signal Strength
Using HyperTerminal, type AT+CSQ
The modem responds with the received signal strength (rssi) and bit error rate (ber).
BER values are always 99.
RSSI ranges are from 0 to 31.
Signal Strength Verification – RSSI
10 - 31 Sufficient
0 - 9 Weak or Insufficient
99 No signal
Note: Modems provisioned for the Sprint network have a different range of values for signal
strength. See the AT Command guide for details.
Checking Network Registration and Roaming Status
In this procedure, you will verify that the Wireless MultiModem has been registered on the wireless network.
Using HyperTerminal, type AT+CREG?
The modem will respond in one of the following ways:
Network Registration Verification
Value Network Registration Status
0,0 The modem is not registered on any network
0,1 The modem is registered on the home network
0,5 The modem is registered on a network and it is roaming
Note: If the modem indicates that it is not registered, verify the signal strength to determine if the problem
is the strength of the received signal.
Checking the Modem’s Identity
Use the ATI command (Note: This command is illustrated using the capital letter i after AT)
•Type ATI0 (Note: The command ends in a zero)
The manufacturing data displays. For example, xxxxx Modem 800 1900
•Type ATI3
The software version displays. For example, S/W VER: xxxxx
•Type ATI6
The capability data displays. For example, +CGSM, +CIS707, ...

Chapter 3 – Using Your Wireless Modem
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 19
Establishing a Voice Call
•Initiate a voice call
Type ATD1234; (Note: Don’t forget the semicolon “;” at the end. This stands for voice calls)
Responses: OK (Communication established)
CME ERROR : 11 (PIN Code not entered [with +CMEE : 1 mode])
CME ERROR : 3 (Operation not allowed)
•Initiate an emergency call
Type ATD112; (Note: Don’t forget the semicolon “;” at the end. This stands for voice calls)
Responses: OK
•Hang up
Type ATH
Responses: OK
Establishing a Circuit-Switched Data (CSD) Connection
A Circuit-Switched Data Connection makes the wireless modem work like a regular analog modem. You must
have CSD service in order to make a CSD call.
Establish a Connection: Using HyperTerminal or a terminal application, you can establish a CSD
connection by entering the following command: ATD<phone number>
Notes:
•The phone number you are calling is entered between the displayed
brackets. Do not type additional brackets. For example, type only ATD
8585551212. 8285551212 is typed between the brackets.
•This command tells the modem to inform the wireless network that you are
initiating a CSD modem call. If you are dialing to another modem, the
remote modem should answer and a connection between the two modems
will be established. If you include a semi-colon (;) at the end of the dialing
string, the modem will instead initiate a Voice call to the phone number
dialed.
Disconnect: Type: +++
Wait about two seconds to see an OK response.
Then type: ATH
Note: +++ is the escape sequence and ATH is the Hang-up command.
Answering a Circuit-Switched Data (CSD) Connection
A Circuit-Switched Data Connection makes the wireless modem work like a regular analog modem. You must
have CSD service in order to answer a CSD call.
Establish A Connection: Using HyperTerminal or a terminal application, enter the following command:
AT+CICB=0 <cr> This sets the modem to answer in data mode.
Then, call into the modem by dialing the number provided by your carrier.
Answer a Call: When you see the RING responses on the terminal screen, enter ATA <cr> to
answer the call.
Set Auto-Answer: Enter ATS0=x
This sets the modem to auto-answer. The call will be answered after the number
of rings entered. x stand for the number rings.
Then call into the modem by dialing the number provided to you by the carrier.
Disconnect: Type: +++
Wait about two seconds to see an OK response.
Then type: ATH

Chapter 3 – Using Your Wireless Modem
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 20
Using Short Message Services (SMS)
Send a Short Message to a Specified Number.
Type AT+CMGS="8585551212" <press Enter>
Then type your message: Please call me soon. <press ctrl Z>
The modem may respond with +CMGS:<mr> OK
Write a Message to Memory.
You can store a message to send it at a later date.
Type AT+CMGW="8585551212" <press Enter>
Type the message. <press ctrl Z>
The modem may respond with +CMGW: 4 OK (The message is stored in the index as message 4.)
Send a Message from Storage.
Type AT+CMSS=x,"8585551212" <press Enter>
The modem may respond with +CMSS: 1 OK (The transmission is successful. One SMS message is
sent.)
Note: The x represents and index location.
View a List of Stored Messages.
Type AT+CMGL=x<press Enter>
For x, substitute one of the following: "UREAD" Show all unread messages.
"READ" Show all read messages.
"USENT" Show all unsent messages.
"SENT" Show all sent messages.
"ALL" Show all d messages.
The modem will respond AT+CMGL: 1,"REC UNREAD","8585551212",1...
The modem will continue until all UNREAD messages, numbers, and index number are listed.
Read a Stored Message.
Type AT+CMGR=x<press Enter>
The modem may respond with +CMGR: "REC READ", "8585551212", ......
Note: The 1 stands for the number of the location to be read. The total number of locations depends on
the amount of memory in your modem.
Note: The x represents and index location.
Delete a Stored Message.
Type AT+CMGD=x,n <press Enter>
For n, substitute one of the following: 0 Delete message at location <include the index number>
1Delete all READ messages.
2Delete all READ and SENT messages.
3 Delete all READ, SENT, and UNSENT messages.
4 Delete ALL messages.
The modem will respond OK.
Note: The x represents and index location.