Actiontec electronic V.90 manual Appendix a AT Command Set, +++Atcr, Registers

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Appendix A: AT Command Set

AT Commands

AT commands are issued to the modem to control the modem’s operation and software configuration. AT commands can only be entered while the modem is in command mode. The format for entering AT commands is:

TYPE: ATXn

where X is the AT command, and n is the specific value for that command.

PRESS: Enter

Any command issued is acknowledged with a response in text format known as result codes. For multiple AT commands in the same command line, the com- mands are executed in the order received from the DTE. Should execution of a command result in an error, or a character not be recognized as a valid command, execution is terminated, the remainder of the command line is ignored, and the ERROR result code is issued. Otherwise, if all commands execute correctly, only the result code associated with the last command shall be issued; result codes for preceding commands are suppressed.

In the following listing, commands and command values accepted by the modem are shown; any entries other than those shown cause the ERROR result code. AT Commands may be entered in upper or lower case letters but you should not mix upper case and lower case letters within the same command line.

+++AT<CR>

Escape sequence

The escape sequence allows the modem to exit data mode and enter on-line com- mand mode. While in on-line command mode, you may communicate directly to your modem using AT commands. Once you are finished, you may return to data mode using the ATO command. If you are in data mode and wish to enter com- mand mode, you must type the escape character (the value stored in S2, typically “+”) three times followed by a valid AT Command and the carriage return charac- ter specified by S-Register S3 (typically <enter>). Using the default values of S2 and S3, the escape sequence would be like this: +++at<enter>

S-Registers

S-registers generally affect how the AT commands perform. Contents of the regis- ters can be displayed or modified when the modem is in command mode.

To display the value of an S-register:

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Contents Page Table of Contents For Windows 3.1 Installation Do This FirstFor Windows 95/98 Installation Win95 Modems Properties PanelPage Page Installing The Modem Jumper SettingsHardware Installation JP2 IRQ interrupt request OptionsPage Connecting Devices to the Modem Configuring WindowsConfiguring Windows 95 OEM SR2 Configuring Windows NT Diskette or CD-ROM into the appropriate drive. Click NextPage Full-Duplex Speakerphone Installing and Configuring Communications SoftwareData TIA/EIA-602 Fax TIA/EIA-578 for Class 1 Fax Voice Troubleshooting Check Modem PropertiesModem Diagnostics Page Common Problems No Dialtone Error Page Appendix a AT Command Set +++ATCRRegisters To display the value of an S-registerRepeat Last Command Disables echo to the computer Enables echo to the computer defaultOn-line Data Character Echo Command On-line character echo disabled. defaultMonitor Speaker Mode This command turns the speaker on or off Speaker is offSpeaker is always on when modem is off-hook Return On-line to Data ModeDisplays result codes as text default Result Code OptionConnect result code reports DTE modem to computer speed Connect result code reports DTE speedM0 Modem only supports asynchronous mode.default Q0 Modem only supports asynchronous modeThis command selects DSR action S0 DSR always on default Data Set Ready DSR OptionSelect Stored Profile On Power-UP Modulation Selections Escape Character Page Default 50 1 second S25 Detect DTR Change FCC Part 68 Requirements Appendix B Communications RegulationsFCC Regulations Declaration of Conformity Canadian Department of Communications Cdoc Requirements for End Users
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