Zyxel-communications U-336SA Uživatelský manuál stáhnout pdf (Strana 150)

136 Diagnostics & Troubleshooting

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.

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Zyxel-communications U-336SA Uživatelský manuál Strana 150