Chapter 4: Command Reference; Using The At Command Set; Overview; General Rules For Using At Commands - US Robotics USR3520 User Manual

Chapter 4: Command Reference

This section includes information about:


Using the AT Command Set

 Modemulator Memory
 AT Command Reference Guide
Using the AT Command Set

Overview

If Modemulator mode is enabled by the
progress, AT commands can be sent to the Modemulator Terminal port to change Modemulator settings.
To send AT commands to the Modemulator, run a terminal emulation application on a computer,
configured so the selected COM port sends whatever is typed to the computer RS-232 serial port that is
attached to the Modemulator. By default, the Modemulator will echo commands back to the terminal.

General rules for using AT commands

Here are some general guidelines for sending AT commands to the Modemulator:
Type AT before each command and press ENTER after each command.
The exceptions are A/ and +++, which require neither AT nor ENTER.
Leave zeroes off the end of AT commands. A missing numeric parameter is assumed to be a zero. For
example, ATE is equivalent to ATE0.
Either use AT (all caps) or at (all lower case). Mixed case, as in At for example, is unacceptable.
Create compound commands of up to 58 characters between AT and ENTER.
Example: AT&H1 D(847)555-1234
AT Attention; a command follows.
&H1 Enable hardware flow control.
D Dial the following number.
Optional hyphens, spaces, and parentheses add to the count of 58 characters.
Commands not recognized will be accepted and ignored.
Modemulator User Guide
Mode switch on the front panel, and if no connection is in-
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