Command Echo Problems; Answer Problems - ZyXEL Communications U-336R/RE User Manual

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
2. Neither your modem nor your communications software is
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.

Answer Problems

Problem
Your modem does not auto-answer incoming calls.
Solutions
1. Make sure the supplied telephone cable is connected to your
128 Diagnostics & Troubleshooting
communications software is using the same COM port as your
modem.
configured to echo characters. Use the E1 command to enable
modem echo, or turn on your software program's Echo (or
duplex) feature.
modem's LINE jack and not the PHONE jack.