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AT Commands
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ATO Return to On-line State
The O command enables you to return to on-line state from command state. When you are on-
line (connected to a remote computer), anything you type is treated as data by your modem. If
you want to send commands to your modem, you must return to local command state by typing
the escape sequence (+++). When you are ready to return to on-line state, use the O command.
If you are off line (modem is on hook) when you are use an ATO command, the modem will go
off hook and attempt to connect in answer mode.
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The O command must be the last command on the command line. If you have
established a connection at greater than 1200bps and are encountering a large
number of data errors in your communications, use the ATO1 command to go on
line and force an equaliser retrain. (An equaliser retrain conditions the phone
line frequencies to reduce the levels of interference and improve data
transmission.)
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Retrains cannot overcome noise on the line.
Options
ATO0 Enter on-line state
ATO1 Enter on-line state and force equaliser retrain (2400bps and higher speeds
only)
ATO2 Retrain, not on-line (2400bps &higher speeds only)
ATO3 Change line speed to 4800 bps (V.32bis/V.34)
ATO4 Change line speed to 7200 bps (V.32bis/V.34)
ATO5 Change line speed to 9600 bps (V.32bis/V.34)
ATO6 Change line speed to 12,000 bps (V.32bis/V.34)
ATO7 Change line speed to 14,400 bps (V.32bis/V.34)
ATO8 Change line speed to 16,800 bps (V.34)
ATO9 Change line speed to 19,200 bps (V.34)
ATO10 Change line speed to 21,600 bps (V.34)
ATO11 Change line speed to 24,000 bps (V.34)
ATO12 Change line speed to 26,400 bps (V.34)
ATO13 Change line speed to 28,800 bps (V.34)
AT014 Change line speed to 32,000 bps (V.34)
ATO15 Change line speed to 33,600 bps (V.34)
ATO23 Change line speed to 4800 bps (V.32bis/V.34)
ATO24 Change line speed to 7200 bps (V.32bis/V.34)
ATO25 Change line speed to 9600 bps (V.32bis/V.34)
ATO66 Change line speed to 12,000 bps (V.32bis/V.34)