Multi-Tech Systems MTCBA-G-UF2, MTCBA-G-UF1 manual GSM/GPRS FAQ on the IP Stack

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Chapter 3 – Troubleshooting

GSM/GPRS FAQ on the IP Stack

Whenever I send the # commands, I receive an error.

•You must enable the stack before the modem will accept the # commands.

•‘AT+WOPEN=1’ will enable the stack and ‘AT#VVERSION’ will display the version of the stack.

•If you receive an error when sending ‘AT+WOPEN=1’, then you may not have the stack present on the modem.

How do I know if I have the stack?

•Use the ‘AT+WOPEN=1’ command. If it returns an error, then the stack may not be present in the modem.

How do I make a GPRS connection using the stack?

•Send: AT#GPRSMODE=1 (sets the modem to GPRS mode) AT#APNSERV=”APN” (sets the APN for the modem to connect) AT+CGATT=1 (attaches the modem to the GPRS network) AT+CGREG=1 (registers the modem onto the GPRS network) AT#CONNECTIONSTART (to start the connection) AT#CONNECTIONSTOP (to stop the connection)

I have T-Mobile. When I try to establish a GPRS connection using the stack, the modem doesn’t connect. It seems like the modem gets reset.

•Check the firmware version: ‘AT+CGMR’.

•Version 640b had a bug that caused the modem to reset when using a non-authenticated account. Authenticated accounts such as AT&T and Cingular work OK. Firmware version 641a fixes this issue.

•You will have to send the modem in for a firmware upgrade. Send it to the attention of the MultiTech Repairs Department. Include a letter stating the problem and that you need the version 641a firmware.

How do I make a connection to my ISP using the stack?

ƒMake sure you have CSD service.

ƒSend: AT#GPRSMODE=0 (sets the modem to GSM mode) AT#DIALN1=”ISP’s access #” AT#DIALSELECT=1

AT#ISPUN=”username”

AT#ISPPW=”password”

AT#CONNECTIONSTART

AT#CONNECTIONSTOP

I can’t use the stack to connect to the GPRS network. I keep getting CME errors.

•Check the CME error number in the AT Command Reference Guide.

•Make sure the modem is attached and registered with the ‘AT+CGATT?’ and ‘AT+CGREG?’ commands.

•Make sure the APN is correct with ‘AT#APNSERV?’.

Can I ping the modem when I have a connection established with the stack?

•Yes, but you must be connected to an APN or server that provides public IP address and is not blocked by a firewall.

Can I ping out using the stack?

•Yes, but you must have the firmware version 641a or higher.

•The command is ‘AT#PINGREMOTE=”<address to ping>”’ and ‘AT#PING’ to start the ping.

•You must have a connection established with the stack in order to use the ping commands.

Does the stack support UDP?

•Yes, but only on the firmware version 641a and above.

Multi-Tech Systems, Inc. MultiModem® GPRS with USB User Guide

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Contents MultiModem Gprs Revision History Revision Date Description Copyright 2006 by Multi-Tech Systems, IncContents Warranty and Repairs Product Description Product Description and SpecificationsNetwork Access Antenna/RF SpecificationsAT Command Info Phone Number for the Wireless ModemFeatures Application Types Application OverviewBenefits/Features in Applications Class 10. Coding schemes CS1 to CS4 Functions GSM ModesSIM receptacle SpecificationsData/Power Connector USB Series a receptacle Antenna Connection type SMA jackLED Indicators Mechanical Mounting InstallationSecure it with screws Inserting SIM/R-UIM Card into Holder GSM Only Connecting the Antenna Windows XP/2003 Installing SoftwarePart a Preparing the Setup Click Next Part B Installing the USB DriverConnect the USB cable between the MultiModem and the PC Part C Associating PC Port with USB Driver Click Install from a list or specific location AdvancedClick Continue Anyway Part D Installing the Modem INF FileThen click Next Windows Click on Install one of the other drivers Installation Part C Associating PC Port with USB Driver Part D Installing the Modem INF File Windows Part B Installing the USB Driver Part C Associating PC Port with USB Driver Mobile Phonetools Connecting the Optional HandsetVerifying Signal Strength Signal Strength VerificationAT + Creg ? Testing the ConfigurationSolutions for error message situations TroubleshootingTroubleshooting Examples Solutions for no carrier message How do I make an Internet connection to my dial-up ISP? GSM/GPRS General FAQHow do I make a Gprs Internet connection using Windows? When I do ‘ATD*99***1#’ in HyperTerminal I get an errorWhich providers can I use? Modem will not answerGSM/GPRS FAQ on the IP Stack How do I send a SMS message? FAQ for Mobile PhoneToolsWhat is the Mobile PhoneTools program? How do I make an Internet connection?Vehicle Safety SafetySafety General SafetyYour Responsibility Maintenance of Gprs ModemMultiTech Warranty Statement Warranty and RepairsReplacement Parts Repair Procedures for International CustomersDisclaimer Wireless Modem Reference InformationReference Information July

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