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U-90E Data/Fax Modem
2. You may have omitted the characters AT from the beginning of the command
line. These characters must appear at the beginning of each command line.
3. You may have typed the commands when your modem was in data state
instead of the command state. To switch from data state to command state,
type the escape sequence code +++. To return to the data state, type ATO and
press Enter.
Problem
AT
You typed an
command, but did not receive an OK or 0 result code.
Solutions
1. Your communications software may be using a different COM port than your
modem. Be sure both the software and your modem are addressing the same
COM port.
2. The E0 and Q1 commands may be in effect, disabling echo and result codes.
To verify this in terminal mode, type AT&V0 and press Enter with the modem in
command state to view the currently active settings. To enable echo and result
codes, type AT E1 Q0 and press Enter.
3. You may have typed the commands when your modem was in the data state
instead of the command state. To switch from data state to command state,
type the escape sequence code +++. To return to data state, type ATO and
press Enter.
Problem
You receive the ERROR result code after typing an
Solution
You may have typed a command that is not recognized by your modem or
communications software.
15-2
AT
command.
Troubleshooting
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