Black Box SW544A-M, Manual, Page: 40 / 74

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CHAPTER 6: The Internal Modem
6.2 Common AT Commands
This section lists some of the most commonly used AT commands for the Serial
Port Manager’s internal modem. For a complete listing of all available AT
Commands and S-Registers, access the modem Command mode and display the
modem Help screen using the $H
n command.
NOTES
Type commands in either upper or lower case. Do not use a
combination of upper- and lower-case characters.
Use the Backspace key to delete errors.
All commands begin with the AT prefix and are invoked by pressing
Enter (Carriage Return). The only exceptions are the A/ command
(Repeat Previous Command) and +++ (Exit to On-Line Command Mode).
The maximum command length is 40 characters. This does not include
the AT prefix, carriage returns, or spaces.
Default settings are marked with an asterisk (*).
Command Function/Options
$H
n
Help screen.
$H1
Help screen #1.
$H2 Help screen #2.
$H3 Help screen #3.
Z Reset modem. All configuration parameters are reset to default
values.
, Pause. Creates pause during dialing. The duration of
the pause is determined by Register S6.
/ Pause for 125 milliseconds.
: Continuous redial.
; Return to Command mode after dialing.
! Causes modem to flash on-hook.
@ Quiet Mode. Causes modem to wait for ringback, followed by five
seconds of silence before processing the next command.