Synxcom SM9234D, User Manual

Page: 168 / 216

AT Commands
Page 168
Command and Syntax Guidelines
Mode Entry Commands
+FCLASS=2 - Select Facsimile Class 2 Mode
+FCLASS=2 selects the Fax Class 2 Mode.
DTE Commands
The ISO 646 character set (CCITT T.50 International Alphabet 5, American
Standard Code for Information Interchange) is used for the issuance of commands
and responses. Only the low-order 7 bits of each character are used for commands
or parameters; the high order bit is ignored. Upper case characters are equivalent
to lower case characters.
For Phase C data transmission or reception, all 8 bits are needed.
DTE Command Lines
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" = ASCII 065, 084 or “at” = ASCII 097, 116.
The body is a string of commands restricted to printable ASCII characters (032 -
126). Space characters (ASCII 032) and control characters other than CR (ASCII
013) and BS (ASCII 010) in the command string are ignored. The default
terminator is the ASCII <CR> character. Characters that precede the AT prefix
are ignored. The command line interpretation begins upon receipt of the carriage
return character.
Facsimile Command Syntax
After the "AT" or "at" prefix, facsimile commands use extended syntax. Each
command is preceded by the “+F” character and consists of single characters and a
decimal parameter (if applicable) terminated by the semicolon “:” character (ASCII
059) or by the <CR> that terminated the command line. A missing decimal
parameter is evaluated as 0.