Multi Tech Equipment MTA128ST manual MTA128S T/NT Commands and S-Registers, AT Commands

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AT Commands, S-Registers, & Result Codes

Chapter 4: ATCommands, S-Registers, and Result Codes

MTA128S T/NT Commands and S-Registers

All references to “TA” in this chapter refer to the MTA1 28ST/NT. This chapter also assumes knowledge of issuing AT commands. <CR> refers to the carriage return character (typically generated by pressing the ENTER or RETURN key on the keyboard).

For command execution details see the additional documents on this CD.

AT Commands

The TA’s command buffer can store 80 characters, including spaces and other characters used in telephone numbers. If you mistype a command string, you can edit it by using the backspace or the delete key, but only before you press <CR>. As you type a command string, it appears on your monitor screen, letting you verify your input as you type it. The table below lists the AT commands recognized by the TA.

If your MTA1 28ST/NT is connected to a computer terminal, you can send AT commands to the

MTA1 28ST/NT by entering them on the keyboard. If your MTA1 28ST/NT is connected to a computer, you can send AT commands to the MTA128ST/NT by typing them in the terminal window of a data communications program such as HyperTerminal. You can also send some AT commands indirectly by configuring your data communications program.

To enter AT commands, use the following format: AT <command string> <cr>. The characters AT cause the MTA128ST/NT to interpret the following string as a command. The command string consists of one or more commands. The carriage return character, <cr>, sends the command string to the MTA128ST/NT. If you are entering a command string in your communication program’s terminal window, insert the carriage return character by pressing the ENTER key on your keyboard. If configuring a communications program, you typically must insert the carriage return character by adding ^M to the end of the command string.

The MTA128ST/NT has three modes of operation: offline command mode (the default state), online command mode, and data mode. The MTA1 28ST/NT responds to AT commands only when it is in one of the command modes. After the MTA1 28ST/NT establishes a connection and goes online in data mode, it interprets any further characters you enter as data rather than as commands and transmits them to the remote device.

When the MTA1 28ST is in data mode, you can switch it to online command mode by sending it an escape sequence. The MTA1 28ST/NT responds to two types of escape sequences:

In-bandwhere the escape sequence is part of the data stream.

The in-band escape sequence is +++AT<cr>. To change the in-band escape character (+), change the value in register S2.

Out-of-bandwhere the escape sequence is outside the data stream. The out-of-band escape sequence is <break >AT<cr>. You can send the break signal in the out-of-band escape sequence only from software, not by pressing SHIFT+BREAK on your keyboard.

When it detects the escape sequence, the MTA1 28ST/NT enters online command mode where it responds to commands while maintaining the connection with the remote device.

The MTA1 28ST/NT’s command buffer can store 80 characters, including spaces and other characters

used in telephone numbers. If you mistype a command string, edit it by using the backspace or the delete key but only before you press ENTER. As you type a command string, it appears on your monitor screen, letting you verify your input as you type it.

The AT commands recognized by the MTA128ST/NT are listed by function in this chapter first in an abbreviated list. For an alphabetical list of AT commands, see the AT commands documents on the CD included with this product.

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Contents Page Revision Date Description Model MTA128ST/NT S000305C Rev. CTrademarks Contents Product Description Introduction and DescriptionSpid Service Profile ID FeaturesIsdn BRI Line NT1 ConnectionInterlace Pin TE SignalPin LED Indicators LED P1 LED P2 LED LED Indicators Switch CompatibiltiyCommand Interface ConnectorsSafety Warnings Hardware InstallationConnecting your TA Connect the TA to Your PC RS-232 Connection Network Configuration Configuration UtilitiesIntroduction Before You StartVoice TEI Call Control ConfigurationDialing Numbers COM Port SettingsDCD Drop Time Configuring your TA Page Page Page Page Page Page Page Page AT Commands MTA128S T/NT Commands and S-RegistersAT Commands by Function Analog Pots Call Commands Digital Data Call Commands aRegisters Register SummaryAT Commands, S-Registers, and Result Codes Result Codes Using AT Commands to Operate the MTA128ST/NTAnswering a Call Making a CallAnswering Manually Hanging UpAnswering Automatically Specific Troubleshooting Situations Troubleshooting the TATroubleshoot ing IntroductionDebugging/Logging/Troubleshooting S-Registers Debugging/Logging/Troubleshooting CommandsNone of the LEDs light when the MTA128ST/NTis on Debugging/Logging/Troubleshooting Command Summary ATMTA128ST/NT does not respond to commands You can place data calls but not voice calls or vice versa MTA128ST/NT dials but cannot make a connectionYou cannot place two simultaneous data calls MTA128ST/NT cannot connect when answeringMTA128ST/NT disconnects while online File transfer appears slower than it should beApple Macintosh Compatibility Making PPP/MLPPP Connections Bonding Using the &, I and + CharactersSoftware Applications that can Format PPP Data Dynamic Bandwidth Allocation DBADBA Data Protocols DBA Features Bandwidth-on-Demand BOD-S60, S61, S62, and S63PPP/MLPPP Warranty Warranty, Service, and Tech SupportRepair Procedures for U.S. and Canadian Customers Repair Procedures for International Distributors Replacement PartsQuick Setup Factory Profiles AppendixAConfiguration ProfilesQuick Setup Example Appendix B Ordering Your Isdn Li ne Bearer ServiceLoop Qualification Using Isdn Ordering Codes IOCs Capability S previously Generic Data M J3 previously Generic Data J-1DNM5 previously Generic Data M-1DN Ordering Isdn Without IOCs Appendices Appendices FCC AppendixC FCCand Canadian RegulationCanadian Limitations Notice Firmware-based Configuration Utility AppendixD Configuration MethodsConfiguration via AT Commands Using AT Commands to Configure the MTA128ST/NTGlossary SymbolGlossary IETFInternet Engineering Task Force PPPMultilink Protocol or MP-is an Internet Glossary TA-Seeterminal adapter Information pages from a central resource. See also Isdn Canadian Regulation 56 Appendix IndexUart