Industrial Grade Modem Hidex II 33T User Manual
Page
5
7/20/2005
11. To return to the command mode without interrupting the connection between the two modems, type
“+++”. Approximately two seconds later, “OK” will appear. The modem is now in command mode and
will accept “AT” commands.
12. To return to the data mode, type “ATO<cr>”. The modem will resume the data connection and no longer
accept AT commands.
13. Type “ATH<cr>” (or “ATH0<cr>”) to terminate the data connection.
AT Commands
AT refers to the command prefix (attention sequence) that precedes each command to the modem. With the
exception of A/ all commands must be preceded by AT and end with a carriage return <return>. Some useful AT
commands commonly used are:
AT
The attention command prefix, a set/reset command.
ATA
Answer
ATDT101
Dial the number (101)
ATH0
Forces the modem on-hook. Hangs up the modem’s connection to the telephone line.
ATH1
Forces the modem off-hook.
ATI
Information -asks the modem for its product ID code.
ATO
Goes online.
ATS0=1
Set number of rings (1) before answering
ATX0
Blind dial – no dial tone necessary.
AT*Y1D2
Send continuous DTMF digit (2).
A/
Repeat last command
The A/ command instructs the modem to repeat the last command line. A command line
termination character is not required for the execution of this command (that is, the command is
executed as soon as the slash is typed).
+++ Return to command state (escape sequence)
The escape sequence is used to force the modem back to the local command state from the on-line
state
Complete AT commands and programming
The complete AT commands can be downloaded from the web address
http://www.industrial-grade-modem.com/down_loads.htm
and select HX II 33T user manual or AT
commands manual.
Table 10 –17 index
Table 10
The basic AT Commands
Table 11
Extended AT& Commands
Table 12
Extended AT% Commands
Table 13
Extended AT\ Commands
Table 14
Result Codes
Table 15
S Register Descriptions
Table 16
User Access Registers (U-Registers)
Table 17
Bit Mapped U-Registers Summary
Industrial Grade Modems
41 Wightman Ct.
Dana Point, CA 92629
Phone: 949-481-6516
Fax: 949-270-1500
