HP Pavilion 6700 HP Pavilion PC's - PCTEL V.90/K56Flex Series AT Command Guide - Page 3

Introduction, AT Command Format, Escape Code Sequence, Escape Sequence TIES.

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AT Command Guide Introduction This manual describes the AT commands for PCTEL modems. AT Command Format A command line is a string of characters sent from a DTE to the modem (DCE) while the modem is in a command state. A command line has a prefix, a body, and a terminator. Each command line (with the exception of the A/ command) must begin with the character sequence AT and must be terminated by a carriage return. Commands entered in upper case or lower case are accepted, but both the A and T must be of the same case, i.e., "AT or "at. The default terminator is the ENTER key character. Characters that precede the AT prefix are ignored. The command line interpretation begins upon receipt of the ENTER key character. Characters within the command line are parsed as commands with associated parameter values. The basic commands consist of single ASCII characters, or single characters proceeded by a prefix character (e.g., "&" or "+"), followed by a decimal parameter. Missing decimal parameters are evaluated as 0. 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 +++AT. To issue a disconnect sequence type +++ATH. This format complies with the Time Independent Escape Sequence (TIES). 3 V90K56DOCATC11A

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3
AT Command Guide
V90K56DOCATC11A
Introduction
This manual describes the AT commands for PCTEL modems.
AT Command Format
A command line is a string of characters sent from a DTE to the modem (DCE) while the modem is
in a command state. A command line has a prefix, a body, and a terminator. Each command line
(with the exception of the A/ command) must begin with the character sequence AT and must be
terminated by a carriage return. Commands entered in upper case or lower case are accepted, but
both the A and T must be of the same case, i.e., “AT or “at.
The default terminator is the ENTER
key <CR> character.
Characters that precede the AT prefix are ignored. The command line
interpretation begins upon receipt of the ENTER key character.
Characters within the command line are parsed as commands with associated parameter values. The
basic commands consist of single ASCII characters, or single characters proceeded by a prefix
character (e.g., “&” or “+”), followed by a decimal parameter. Missing decimal parameters are
evaluated as 0.
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
+++AT<ENTER>. To issue a disconnect sequence type +++ATH<ENTER>. This format
complies
with the Time Independent
Escape Sequence (TIES).