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Chapter 13 - Diagnostics & Troubleshooting
13-5
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 AT0 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.
Solutions
1. Make sure the DTR LED is ON. If it is OFF, make sure your communications
software is using the same COM port as your modem.
2. Neither your modem nor your communications software is configured to echo
characters. Use the E1 command to enable modem echo, or turn on your
software program’s Echo (or duplex) feature .
Problem
Each character you type appears twice on your computer screen.
Solution
Both your modem and your communications software are echoing characters to
your screen. Use the E0 command to disable modem echo, or turn off your
software program’s echo (or duplex) feature.