Command Echo Problems - ZyXEL Communications U-336S User Manual

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
You typed an AT 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 AT command.
Solution
You may have typed a command that is not recognized by your modem
or communications software.

Command Echo Problems

Problem
You do not see any typed characters on your computer screen.
136 Diagnostics & Troubleshooting