At Command Set And S Registers; The At Command Set; Command Mode And Data Mode - Bausch Proxima ISDN Lite Manuel D'utilisation

3.

AT command set and S registers

3.2

The AT command set

This chapter discusses the terminal adapter commands. Most terminal adapters and communication programs use the AT
command set. In order to support new equipment like terminal adapters with AT commands as well, manufacturers have
added commands of their own to the AT command set. This means we can no longer speak of a standard. A distinction is
drawn between the 'Standard AT' and the 'Extended AT' command set.
A number of reasons can be thought of to explain the command differences. Owing to deviating test requirements, some
specific commands or settings are prohibited in some countries. There are also differences in American and European
transmission standards (Bell as distinct from ITU, Euro-ISDN).
The terminal adapters understand b oth the Standard and the Extended AT command set. In addition, a number of separate
commands have been included.
In the first section of this chapter, the command mode and data mode concepts are explained. Next, the command line
structure is discussed. Th is is followed by a list of AT commands and S registers, after which each command and register is
explained individually.
The description of the commands and register settings are grouped per subject:
•
General settings
•
Kiezen en BeantwoordenDialing and answering
•
Dialing an ISDN number
•
3.6 Serial port settings
•
3.7 Profiles and identification
•
Overige commando's
5.1.5

Command mode and data mode

The terminal adapter has two modes:
1. Command mode
In this mode the terminal adapter executes commands that are keyed in at the terminal. The terminal adapter is in
command mode when it isn't on-line, or in a data connection, when it is set to command m ode by way of the escape
sequence.
2. Data mode
The terminal adapter is transparent, which means the information exchanged through both the terminal adapters remains
unchanged. In a data connection, the terminal adapter normally is in data mode. If the terminal adapter is to execute a
command, this can only be achieved from command mode. The terminal adapter can be switched to command mode
during a connection by using the escape sequence.
Escape sequence:
The terminal adapter is now in command mode.
The terminal adapter can be switched back to data mode through ATO.
wait for 1 second
type: +++
'OK' appears after 1 second
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