Data Command Set; Command Guidelines; Escape Code Sequence; Data Commands - Conexant H08-15355F Reference Manual

3.1 COMMAND GUIDELINES

The commands used to control and report modem operation in data modem mode are defined in this section.
The Data Modem Mode commands and responses described in this section are applicable when command +FCLASS=0.
(See Section 3.2.1.2 for the definition of the FCLASS command.)
The default values are typical of a fully configured modem supporting all data rates and options. The actual default value is
dependent upon modem software as defined by the .INF File.
Commands are accepted by the modem once the previous command has been fully executed, which is normally indicated by
the return of an appropriate result code. Execution of commands D and A, either as a result of a direct command or a re-
execute command, will be aborted if another character is entered before completion of the handshake.

3.1.1 Escape Code Sequence

When the modem has established a connection and has entered on-line data mode, it is possible to break into the data
transmission in order to issue further commands to the modem in an on-line command mode. This is achieved by the DTE
sending to the modem a sequence of three ASCII characters specified by register S2. The default character is '+'. The
maximum time allowed between receipt of the last character of the three escape character sequence from the DTE and
sending of the OK result code to the DTE is controlled by the S12 register.

3.2 DATA COMMANDS

The modem will respond to the commands detailed below. Parameters applicable to each command are listed with the
command description. The defaults shown correspond to default values provided in the .INF File.

3.2.1 Generic Modem Control

3.2.1.1 Z - Reset to Default Configuration

This command instructs the modem to reset to default values as altered by non-volatile parameter storage. If the modem is
connected to the line, it will be disconnected from the line, terminating any call in progress.
All of the functions of the command are completed before the modem issues the result code. The DTE should not include
additional commands on the same command line after the Z command because such commands are ignored.
Syntax
Z
Result Code
OK
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Command Reference Manual

3. DATA COMMAND SET

Conexant
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