Multi Tech Equipment GPRS USB manual Troubleshooting Frequently Asked Questions

Page 29

Chapter 4 – Troubleshooting and Frequently Asked Questions

Chapter 4 – Troubleshooting and

Frequently Asked Questions

Troubleshooting Examples

Before calling the Multi-Tech Technical Support, check to the following connections:

The right antenna is connected to the modem

The serial cable connection is correct

The power is connected correctly and the power lights on the modem are on

Verify your signal strength

Verify your network registration

Use the following situation examples to troubleshoot the modem not answering and the modem returning a No Carrier message.

Situation A: The modem does not answer

If the Wireless MultiModem does not answer through the serial link upon an attempted transmission of data or voice signals, see the table below for possible causes and solutions.

Solutions for ‘no connection through serial link’ situation

If the

Then ask …

Action

modem

 

 

returns …

 

 

(nothing)

Is the communication program

In communications program, verify that modem

 

properly configured?

parameters have been set to the values shown here:

 

 

Data bits = 8

 

 

Parity = none

 

 

Stop Bits = 1

 

 

Baud = 115200 bps

 

Is another program interfering

Close any such application program.

 

with the communication

 

 

program?

 

 

Is the modem set to

Type ATS0=1 (to set to auto answer on the first ring)

 

autoanswer?

Type ATA (to set to manual answer)

 

Is the communication program

Type ATS0=1 (to set to auto answer on the first ring)

 

receiving RING responses?

Type ATA (to set to manual answer)

Situation B: The modem always returns «No carrier» when trying to originate a call

Solutions for “no carrier” message

If the modem

Then ask …

Action

returns …

 

 

no carrier

Is the selected bearer type

Type AT+CEER to view the extended error code (see

(esp. for data

supported by the called

“Error Results Codes" in the AT Command guide).

communication)

party?

Be sure that the selected bearer type is supported by the

 

 

called party.

 

Is the selected bearer type

Be sure that the selected bearer type is supported by the

 

supported by the network?

network.

 

 

If no success, try bearer selection type: AT+CBST=0,0,3

 

 

Be sure SIM card is available for data/fax calls.

no carrier

 

Be sure that the semicolon character (“;”) is typed

(esp. for voice

 

immediately after the phone number in the AT command;

communication)

 

e.g., ATD######;

Multi-Tech Systems, Inc. MultiModem GPRS USB Wireless Modem User Guide

29

Image 29
Contents MultiModem Gprs USB Trademarks and Logos Revision History Date DescriptionWorld Headquarters Technical Support Country By Email By PhoneContents Features Product Description SpecificationsProduct Description ModelsApplication Types Benefits/Features in ApplicationsApplication Overview Safety Package Contents Antenna/RF Specifications SpecificationsElectrical Characteristics Current RequirementsLEDs AT Command Reference GuidesInterfaces Insert the SIM Card into the Holder Activation InstallationActivate Your Wireless Account Handset Connection Optional Connect the Antenna and USB CableAttach the Modem to a Flat Surface Optional Introduction Install the Modem DriverPart a for Windows XP/2003 Installing the USB Driver Click Continue Anyway Click on Install from a list or specific location AdvancedCompleting the Found New Hardware Wizard screen appears Part C for Windows XP/2003 Installing the Modem INF File Part a for Windows 2000 Installing the USB Driver Installing the Modem Driver in WindowsPage Part B for Windows 2000 Associating PC Port with USB Driver Part C for Windows 2000 Installing the Modem INF File Examples of Useful AT Commands Using Your Wireless ModemPhone Number for the Wireless Modem Establishing a Voice Call Establishing a Circuit-Switched Data CSD ConnectionAnswering a Circuit-Switched Data CSD Connection Using Short Message Services SMS Send an SMS message to another SMS compatible device SMS ExamplesUsing Your Wireless Modem Connecting to the Gprs Network for Internet Access Internet AccessRequirements Modem Options windowCreate Your Dial-Up Connection in Windows XP/2003 Disconnecting the ConnectionMobile PhoneTools Troubleshooting Examples Troubleshooting Frequently Asked QuestionsSolutions for ‘no connection through serial link’ situation Solutions for no carrier messageFrequently Asked Questions How do I send an SMS message to an email account? Etsi contact Wireless Modem Reference InformationReference Information Repair Procedures for U.S. and Canadian Customers Appendix a Warranty and RepairsMulti-Tech Warranty Statement Repair Procedures for International Distributors Repair Procedures for International CustomersReplacement Parts Outside U.S.A. and CanadaJuly