This information applies to HP and Compaq PCs with a modem running Windows 98, Me, and Windows XP.
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HP and Compaq PCs - Testing the Modem with HyperTerminal Using AT Commands
Use HyperTerminal to test whether modem is working correctly.
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To open HyperTerminal, click Start, click Programs, and then click Accessories.
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Click Communications, and then click HyperTerminal.
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Depending on your Windows version:
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Double-click the HyperTerminal icon, and click Cancel.
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Click Cancel in the Connection Description window.
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Type the commands in the following table in the HyperTerminal window. The letters are not case sensitive.After typing each AT command, press the Enter key to get a response.
Command
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Response
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Description
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ATA (ata)
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Handshake sounds if modem speaker is enabled.
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Modem tries to answer call with handshake sounds. Press Enter to stop this process. The no carrier message is normal with this command. This command does not apply to Windows XP.
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ATDT<ISP Phone Number>
For example, ATDT1234567 (where 1234567 is the connection number to dial for Internet service).
To connect to a test server in the US you can type:
ATDT18666633665
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Login: _
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Connects to a test server. If you can get to a login, your modem is working correctly.
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ATDT (atdt)
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Dialtone
if modem speaker is enabled.
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Indicates that the modem can get a dial tone. The message "no dial tone" indicates that either the modem or phone line is not working correctly.
Press Enter to stop this process.
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AT&F
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OK
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Resets most modems to factory defaults.
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ATI0 (ati)
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56000 ok
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The response varies between modems, but returns the modem speed..
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ATI3 (ati)
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<Version and name>
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Returns the modem product type and firmware version.
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ATZ (atz)
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ok
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This command resets the modem.
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ATH (ath)
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ok
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Hangs up modem
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ATS0=2 (ats0=2)
Zero, not the letter O.
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ok
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This command sets the modem to receive. Call the computer's phone number and you should hear the handshake signal. Ring, ring displays on HyperTerminal screen, followed by no carrier, when the caller hangs up.
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If the modem responds to these commands in this way, it is functional.
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