LandCell CDM819s User Manual

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Contents

LandCell CDM819s User Manual Manual pdf 16 page image

your terminal emulation software (settings: 115200bps, 8, N, 1, Hardware). Now, you mayissue the AT+IPR command to query or change the default speed. After adjusting the portspeed, disconnect from the modem and reconnect using the new data rate. Refer to the"Frequently Asked Questions" section 7.0 and "Extended AT Configurations CommandTable" section 8.7 for more information pertaining to the AT+IPR command.• Make certain the serial cable is firmly connected to an enabled COM port with no hardwareresource conflicts. Make sure that you have properly added the "Standard 19200 bps Modem"to your system using the "Setting Up Your Modem" section 2.1 above. Also, check to see ifyou have an infrared (IR) port assigned to your modem's COM port. Disable it if you are notusing this function. Often, an IR port can interfere with the COM port even after yousuccessfully connect. Device Manager may indicate that there is no conflict between the two,but disabling the IR port may still help.• If your system's COM port appears to be locked, you may have to shut down and reboot yoursystem.• Do not use "Disable Call Waiting" (commonly referred to as *70) when configuring DialingProperties.• Make certain that you are using the proper RS-232 serial cable. For most applications, youmust use a straight-through RS-232 serial cable. For certain types of equipment, you may berequired to use a null modem cable. For more information on this, refer to the FAQ section7.12 titled "When Do I Need A Null Modem Cable?".6.1 Diagnosing COM Port Problems Using HyperterminalIf you are experiencing problems connecting to the cellular network, you can verify if the issue isbetween the computer and the modem or between the modem and the cellular network. To test,open your terminal emulation software as described in the "Using Terminal Emulation SoftwareTo Talk To The Modem" section 3.0 above. Once the modem is ready to accept commands, type:AT+GSN and press enter. The ESN of the modem should print out on the screen in the followingformat “+GSN: 45262036”. This will confirm that you are communicating with the Land-Cellular modem and not some other device connected to or inside the PC. If the ESN does notprint out, please confirm that you have selected the COM port that the modem is attached to, andnot some other port, internal modems typically show up as COM3.To test the link between your modem and the cellular network try to call your cell phone. Typein: AT+CDV (with no spaces and no angle brackets) and press enter.This command will perform a voice call similar to the type a standard home phone would makeand if your modem has been activated correctly your cell phone should ring and display thenumber of the modem. Answer the incoming call on your cell phone and then hang-up your cellphone. If you are properly communicating with the modem using the steps above and still cannotconnect through the cellular network, here are a few items to check:• Call the phone number of the modem. If the phone number is not active, the cellularservice will inform you of this.• Confirm that the ESN on the Label matches the ESN in the module with AT+GSN Thiswill print out the ESN of the Modem in Hex format, +GSN: 45263F2A. This rarelyhappens, but if the numbers do not match, the wrong ESN may be in your Account.• Contact your cellular provider and make certain that the Electronic Serial Number (ESN)of the modem is active in their system.• Check the signal strength reaching the modem using the following command: AT+CSQ?A typical reply is +CSQ? 19,99.The signal strength ranges from 0 to 31, the higher thenumber the better the signal. See also the FAQ for more information on "No Carrier"issues.

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