Telenetics 56 - Manual (Page 31)

AT Commands
Page 23
Appendix A
AT Commands
Syntax and Procedures
The command and response syntax and procedures generally conform to referenced recommendations
and standards. Since these recommendations and standards describe characteristics universal to a large
installed base of modems to a maximum degree, there may be syntax and procedural differences due to
extensions and behavioral differences in implemented commands, parameters, and responses beyond
that described in these recommendations and standards.
The syntax and procedures described in this appendix are based on V.250 and V.253 with additional
information included for implemented extensions, behavioral differences beyond V.250, and legacy
commands.
Alphabet
The T.50 International Alphabet 5 (IA5) is used in this document. Only the low-order seven bits of each
character are significant to the modem; any eighth or higher-order bit(s), if present, are ignored for the
purpose of identifying commands and parameters. Lower-case characters are considered identical to
their upper-case equivalents when received by the modem from the DTE. Result codes from the modem
are in upper case.
DTE Commands Lines
Words enclosed in <angle brackets> are references to syntactical elements. The brackets are not used
when the words appear in a command line, the brackets are not used. Words enclosed in [square
brackets] represent optional items which may be omitted from the command line at the specified point.
The square brackets are not used when the words appear in the command line. Other characters that
appear in syntax descriptions must as included as shown. Any modem responses are mentioned in terms
of their alphabetic format; the actual response issued will depend on the setting of parameters that affect
response formats, e.g., Q and V commands (see 2.7).