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Chapter 2 – AT Commands
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F) 6
Command: DS=n Dial Stored Telephone Number
Values: n = 0–3
Default: none
Description: Dials a number previously stored in directory number n by the &Zn=x command.
Example: ATDS=3.
Command: En Echo Command Mode Characters
Values: n = 0 or 1
Default: 1
Description: E0 Does not echo keyboard input to the terminal.
E1 Does echo keyboard input to the terminal.
Command: Hn Hook Control
Values: n = 0 or 1
Default: 0
Description: H0 Goes on-hook (hang up) and terminate any &T test in progress.
H1 Goes off-hook (make the phone line busy); enters command mode.
Command: In Information Request
Values: n = 0–6
Default: None
Description: I0 Displays the product code. Example: MT5600BA-V92.
I1 Calculates ROM checksum; displays the least significant byte in decimal format.
I2 Calculates ROM checksum and compares it to the prestored checksum, displays
OK if they match or ERROR if they don’t match.
I3 Displays the firmware version and application codes.
I4 Displays the OEM-defined identifier string in either binary or ASCII format.
I5 Displays the regional or country code. Example: 098.
I6 Displays the modem data pump model and internal code version.
Command: L Not applicable.
Command: L5 Lists Current Operating Parameters
Value: 5
Default: None
Description: Displays the current values for the error correction, flow control, data compression, and
serial port speed commands. Example: atL5
&E2 &E3 &E15 $SB115200
OK
Note: Use the &V command to display the other parameters.
Command: Mn Monitor Speaker Mode
Values: n= 0, 1, 2, or 3
Default: 1
Description: M0 Speaker is always off.
M1 Speaker is on until the carrier signal is detected.
M2 Speaker is always on when the modem is off-hook.
M3 Speaker is off when receiving carrier and during dialing, but on during answering.
Command: On Return Online to Data Mode
Values: 0 or 1
Default: None
Description: O0 Exit online command mode and return to online data mode without a retrain.
Normally used after a +++ escape (see +++ escape sequence).
O1 Exit online command mode and return to online data mode after a retrain.
Command: P Pulse Dialing
Values: P,T
Default: T
Description: Forces pulse (non-touch-tone) dialing until a T command or T dial modifier is received.