User guide

4 AT Commands, S-Registers, and Result Codes
23
@ Wait for quiet answer. Causes the modem to wait for a
ringback, then 5 seconds of silence, before processing the
next part of the command. If silence is not detected, the
modem returns a NO ANSWER code.
& Wait for credit card dialing tone before continuing with the
dial string (wait contingent on S7 setting). The character
should follow the phone number and precede the user’s
call card number, e.g., ATDT1028806127853500
$123456789.
^ Toggle data calling tone on or off. Applies only to current
dialing attempt.
Command: DS= n Dial Stored Telephone Number
Values: n = 0–3
Default: none
Description: Dial a number previously stored in directory number n by the
&Zy=n command. Example: ATDS=3.
Command: E
n Echo Command Mode Characters
Values: n = 0 or 1
Default: 1
Description: E0 Do not echo keyboard input to the terminal.
E1 Do echo keyboard input to the terminal.
Command: H n Hook Control
Values: n = 0 or 1
Default: 0
Description: H0 Go on-hook (hang up) and terminate any &T test in progress.
H1 Go off-hook (makes phone line busy); enters command mode.
Command: I n Information Request
Values: n = 0–6
Default: None
Description: I0 Display the product code. Example: MT5600ZDX.
I1 Calculate the ROM checksum and display the least significant
byte in decimal format.
I2 Displays OK.
I3 Display the firmware version and application codes.
I4 Display the OEM-defined identifier string in either binary or
ASCII format.
I5 Display the country code. Example: 098.
I6 Display the modem data pump model and internal code version.
Command: L5 Lists Current Operating Parameters
Values: See Description
Default: none
Description: Lists the current values of error correction, flow control, data
compression, and serial port speed. Example:
at
OK
atl5
&E2 &E3 &E15 $SB115200
OK