Multi-Tech Systems MT4X56USB 22bis Guard Tone Control, Auxiliary Relay Control, Test Commands

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MultiModemUSB User Guide

Command:	&Gn	V.22bis Guard Tone Control
Values:		n = 0, 1, or 2
Default:		0
Description:	&G0	Disable guard tone.
	&G1	Set guard tone to 550 Hz.
	&G2	Set guard tone to 1800 Hz.

Note: The &G command is not used in North America.

Command:	&Jn	Auxiliary Relay Control
Values:		n = 0
Default:		0
Description:	&J0	The auxiliary relay is never closed.
	&J1	Not supported—responds ERROR.

Command:	&Kn	Flow Control Selection
Values:		n = 0, 3, or 4
Defaults:		3
Description:	&K0	Disable flow control.
	&K3	Enable CTS/RTS hardware flow control.
	&K4	Enable XON/XOFF software flow control.

Command:	&Mn	Communications Mode
Values:		n = 0
Defaults:		0
Description:	&M0	Asynchronous mode.
	&M1	Not supported—responds ERROR.

Command:	&Qn	Asynchronous Communications Mode
Values:		n = 0, 5, 6, 8, or 9
Default:		5
Description:	&Q0	Asynchronous with data buffering. Same as \N0.
	&Q5	Error control with data buffering. Same as \N3.
	&Q6	Asynchronous with data buffering. Same as \N0.
	&Q8	MNP error control mode. If MNP error control is not established, the modem falls back according
		to the setting in S36.
	&Q9	V.42 or MNP error control mode. If neither error control is established, the modem falls back
		according to the setting in S36.
Command:	&Sn	Data Set Ready (DSR) Control
Values:		n = 0 or 1
Default:		0
Description:	&S0	Force DSR always high (on).
	&S1	Let DSR go high only during a connection.
Command:	&Tn	V.54 Test Commands
Values:		n = 0, 1, 3 or 6
Default:		None
Description:	&T0	Abort. Stop any test in progress.
	&T1	Local analog loopback test.
	&T3	Local digital loopback test.
	&T6	Remote digital loopback test.
Note: To stop a test, you must use the escape sequence (+++AT) before typing AT&T0.
Command:	&V	Display Current Settings
Values:		n/a
Description:		Displays the active modem settings, including the callback security settings if callback security is
		enabled. If the setup password has been entered, it also displays the callback security passwords.

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MT4X56USB

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Contents MultiModemUSB Model MT4X56USB User GuideUser Guide Record of RevisionsPatents TrademarksContents Glossary of Terms Index Introduction and Description MultiModemUSB User Guide FeaturesIntroduction Technical Specifications InstallationPreview of this Guide Introduction and DescriptionRelated Documentation Front Panel Modem Ports Ports 1, 2, 3,Hub SystemRJ-ll Modem Connector USB Type a Upstream ConnectorUSB Type B Downstream Connector Power ConnectorInstallation Safety Warning Telecom UnpackingInstallation Cabling your MT4X56USBMT4X56USB Software Loading and Configuration MT4X56USB Drivers for Windows System USB SupportLoading your Driver Software Software Loading and Configuration Uninstalling MultiModemUSB in Windows MT4X56USB Drivers for Windows Uninstalling MultiModemUSB in Windows MultiModemUSB Drivers Install dialog box displays Click Next MT4X56USB Drivers for Windows NTAdd/Remove Uninstalling MultiModemUSB in Windows NTSelect Add/Remove Programs MT4X56USB Drivers for Windows Click Finish Software Loading and Configuration Select Add/Remove Hardware Installing Your V.90 Modems Click Start Settings Control Panel ModemsRead Carefully Software Loading and Configuration MT4X56USB Installing Your V.90 Modems Windows Click Start Settings Control Panel Phone and Modems optionMT4X56USB Software Loading and Configuration Windows 95/98 Configuration Utility MT4X56USB Windows NT 4.0/2000 Configuration Utility MT4X56USB MT4X56USB AT Commands, S-Registers and Result Codes AT Command Summary Command Enter KeyRepeat Last Command AnswerAT Commands, S-Registers and Result Codes Return Online to Data Mode Result Codes Enable/DisableInformation Request Modulation HandshakeModem Reset Load Factory SettingsTone Dialing Result Code FormatCommunications Mode Asynchronous Communications ModeTest Commands Display Current SettingsStore Current Configuration Select Stored Configuration for Hard ResetCommand &Zy=x Store Dialing Command \An Select Maximum MNP Block Size\Nn Error Correction Mode Selection \Tn Inactivity Timer\Kn Break Control \Qn Flow Control SelectionCommand %DCn AT Command Control Command %En Fallback and Fall Forward ControlEnter Setup Password Command #S=x Store Setup PasswordCommand +++ATCR Escape Sequence Command %%%ATCRRemote Configuration Escape SequenceRegister Unit Range Default Description RegistersS38 Upstream data ratesResult Codes Terse Verbose DescriptionFor more information on scripting, click the Help button Remote Configuration Changing the Setup Password Remote Configuration ProcedureSetup Changing the Remote Escape Character Remote Configuration CommandsRemote Configuration and Management MT4X56USB Troubleshooting Modem Dials But Cannot Connect None of the Indicators LightModem Does Not Respond to Commands Troubleshooting Modem Disconnects While OnlineModem Cannot Connect When Answering Loopback TestsModem Doesn’t Work with Caller ID Fax and Data Software Can’t Run at the Same TimeTest procedure Local Analog Loopback Test V.54 LoopRemote Digital Loopback Test V.54 Loop Remote digital loopback testLocal Digital Loopback Test V.54 Loop Local digital loopback testWindows 95/98 Troubleshooting Determining Why USB Support Is Not PresentInstalling Microsoft USB Support Double-click the Universal Serial Bus Controller iconUpgrade Procedure Upgrade Overview Identify the MT4X56USB FirmwareIdentify the Current Firmware Version Multi-Tech Web SiteDownload the Upgrade File Extract the Upgrade FilesUpgrade Procedure Clear Your Stored ParamentersUpgrade the Modem’s Firmware Restore Your ParametersService, Warranty and Tech Support Software User License Agreement Limited Warranty On-line Warranty RegistrationService, Warranty and Tech Support Tech SupportService Contacting Tech Support via E-mailAppendices Appendix a Regulatory Information Class B StatementFCC Part Industry CanadaFCC Part 68 Telecom AppendicesFAX Branding Statement Canadian Limitations NoticeEMC, Safety and Terminal Directive Compliance Commission Decision CTR21New Zealand Telecom Warning Notice International Modem RestrictionsIntroduction TroubleshootingAppendix B V.90 Support Glossary of Terms MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Index IndexConfiguration MT4X56USB Software user license agreement Speed