Learning by Doing: CISCO Certified Network ... - SCN Research

Modems use their own little language. Every language has its own alphabet and modemspeak
is no different. Here is the common “alphabet” of modem-speak:
a-z “alphabet” * “asterisk”
^ “carat” - “hyphen”
$ “dollar sign” : “colon”
% “percent sign” @ “character command set”
& “ampersand” \ “backslash”
) “parenthesis” # “character command set”
Each one is unique and each one can be command with other “alphabet letters” to make
scripts in modem-speak. I have filled in a chart with some common commands for my
Hayes modem and what they do. Complete the chart with commands for your modem.
Your modem My Hayes V.90 Description of command
AT
attention
D
dial
H
Hang up
^V
Display bootstrap revision
$B57600 Set serial port to 57600 bps
$D Run power-up diagnostics
%M Set modulation
&C1
Set up modem for carrier detect
&D3
Set up modem for when the data terminal ready (dtr)
transitions to “off”
&F
Load factory defaults and settings
&K3
Set hardware flow control
&Q9
Set compression
&T
Diagnostic test mode
&W
Save configuration to modem
-D Repeat dial
@E
Detailed modem call status
\E Echo
\S Read on-line status
Writing scripts:
You can combine several modem-speak commands to write scripts. The one I frequently
use is:
AT&FS0=1&C1&D3&K3&Q9&W
Let’s break it down and see what it really does…
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