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The ; modifier recalls the command mode and prevents the modem from
training. The remote site must be answered by the telephone for the
voice call to be successful.
Switching from Voice to Data
After dialing, place the modems at both ends in data mode by pressing
the TALK/DATA button. The *DA1 command can also be used to
change from talk mode to data mode.
ANSWERING A CALL
There are three ways to answer a call for a data connection:
• Manual
• AT Command
• Autoanswer
The most common is autoanswer.
Manual Answer
When the phone rings, answer by pressing the TALK/DATA button.
AT Command Answer A
The modem can be made to go off hook in the answer mode by entering
ATA when the phone rings. This commands the modem to go to the
answer mode and connect.
Autoanswer S0
Autoanswer is controlled by register S0. S0 determines which ring the
modem answers on. S0 can be loaded with a value between 1 and 255
for autoanswer.
Entering ATS0=0 disables the autoanswer feature. Decide which ring
the modem is to answer on and set S0 to that decimal value.
When S0 is one or greater, the modem automatically answers on the
selected ring and connects with the calling modem.
V.3400
AT Commands
5-17
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