Mn - Select Speaker Function Option


Command Line Format
AT [cmds] M [suffix] [cmds] &ltCR>

Suffix Values
0 through 4

Default
M1

Stored by &Wn
yes

Displayed by &V
yes

Description
This command selects the speaker option.

M0 - Speaker always off.

M1 - Speaker on while off hook until carrier detected.

M2 - Speaker always on while off hook; stays on after carrier is detected.

M3 - Speaker off as digits are dialed, then on until carrier is detected.

M4 - Speaker is off and call progress is sent to the DTE as described below:

When M4 is selected, dialing and call progress are reported to the DTE by means of lines of text. Each consists of <CR><LF>followed by the text to be presented. The text possibilities are as follows:

DIAL TONE

HANDSHAKING

RINGING

SELECT ANSWER


When dialing progress is reported, each digit or dial modifier character is sent to the DTE before the item is acted upon by the modem (within 20 ms before). For example, the first dialed digit would be sent to the DTE just before it is sent to the PSTN (Public Switched Telephone Network). A comma dial modifier is presented to the DTE at the beginning of the pause invoked by the comma.

Dial tone is reported only if dial tone is actually detected. Dial tone is not reported if the X3 command is selected and dialing starts after a timed pause with no dial tone detected.

The modem reports silent answer if the conditions for detection are met, independent of whether the @ dial modifier was included in the dial string.

If the S=n dial modifier is in the command sent to the modem, the modem presents the equivalent dial digits and modifiers to the DTE, not S=n.

The following lines constitute an example of the characters sent to the DTE when M4 is selected after a command (the command echo is the first line of the example). The connect message is a result code and is preceded and followed by &ltCR&gt&ltLF>when the V1 command is selected.

ATDT9W5551234@5678

DIAL TONE

T9W

DIAL TONE

5551234@

RINGING

SILENT ANSWER

5678

HANDSHAKING

CONNECT 2400

Even if the modem is already off hook, the speaker control is immediately updated by an Mn command.

Execution Time
100 ms maximum

Cross Reference
Commands - D - Dial Command , Ln - Select Speaker Volume Level

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