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Operation
•
The AT parser that acts on the commands is located in DTE interface circuitry. Therefore, the
unit can only accept AT commands while it is off-line (idle mode). If you attempt an AT session
while the unit is in data mode, it responds with the message:
WARNING: THE MODEM IS ON LINE. Do you wish to Continue? (Y/N):
If you do not want to interrupt the connection, type N and press Enter. The terminal interface
display returns to the Main Menu.
•
Procedures for an AT command session vary depending on whether the modem is configured
for switched network or private line operation. Both procedures are provided below.
Switched Line Modems
1. At the Main Menu screen, type 1 and press Enter.
2. If the selected unit is on-line, the screen displays the message:
WARNING: THE MODEM IS ON LINE. Do you wish to Continue? (Y/N):
Type Y and press Enter to make the unit disconnect and enter the AT Session. If you choose
not to interrupt communications, type N and press Enter.
3. When you're in the AT Session, either because the selected unit was not on-line or because you
had it disconnect, the screen displays the message:
To Exit AT Mode and Return to Main Menu, use the "AT<" Command !
Type AT commands to the unit just as you would from the DTE.
4. When you are done entering commands, type AT< and press Enter. The display returns to
the Main Menu screen.
Private Line Modems
1. At the Main Menu screen, type 1 and press Enter. The screen displays the message:
WARNING: THE MODEM IS ON LINE. Do you wish to Continue? (Y/N):
Type Y and press Enter key to make the unit disconnect and enter the AT Session. The
screen then displays the message:
To Exit AT Mode and Return to Main Menu, use the "AT<" Command !
2. Because it is configured for private line operation, the unit immediately begins retraining to
return on-line. The retrain process takes about 20 seconds, during which the unit can accept AT
commands. The next steps extend the time available for inputting AT commands.
3. Begin the AT Session by checking and recording two details from AT help screens so you can
be sure to restore the settings correctly at the end of the AT Session.
4. Type AT&$ and press Enter to display the current settings of the AT& options. Write down
the setting of the &L option that determines the network type the unit is operating in
(switched or 2-wire private).
5. Type AT%$ and press Enter to display the current settings of the AT% options. Write
down the setting of the %O option that determines which band the unit transmits on (originate
or answer).
060R122-000
Issue 15
SpectraComm Dual V.34 Modem
Installation and Operation
Modem Main Menu
3-41
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