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D - Dial Command
This command causes the modem to immediately gooff-hook as an originating modem and dial
a telephonenumber withcorresponding dial modifiers.Dial modifiersare parameters thatdefine
how the modem should dial the telephone number.
Dial Modifiers
0-9 Dialling Digits
A, B, C, D, *, # Tone Dial Characters
P Pulse Dial: configures the modem to use pulse dialling to dial a telephone number.
R Reverse Originate Mode: places the modem in answer mode.
This modifier should be the last character in the Dialling string (for example,
ATDT 12345678R). After dialling the telephone number, the modem goes
into data modem answer mode instead of originate mode.
S = n Dial NVRAM Telephone Number: causes the modem to dial a telephone
number previously stored in the NVRAM with the AT&Zn=x command.
T Tone Dial: configures the modem to use DTMF tones to dial a telephone number.
W Wait for Dial Tone: causes the modem to look for dial tone for a specified
amount of time. If dial tone or the amount of time specified by the S6
register times out, the modem processes the next command in the dial
string. If a busy signal is detected, the modem responds to the DTE with a
busy response code and then enters off-line command mode.
<space> - ( ) Ignored by Modem: these four characters are ignored by the modem.
Spaces also may be included in the dial string to separate area codes and
numbers.
L Dials the last number used for dialling.
E - Command Mode Echo
This command selects whether the modem echoes AT commands back to the host in either
online or off-line command mode.
E0 Echo disabled
E1* Echo enabled
H - Switch Hook Control
This command controls the telephone line relay (OHREL*) and causes the modem to either
hang up or pick up the telephone line. The H command can be issued only after the escape
sequence has been entered.
H0* Hang up telephone line (go on-hook)
H1 Pick up telephone line (go off-hook)
Q - Result Code Display Control
This command selects whether the modem sends result codes to the DTE.
Q0* Result codes enabled
Q1 Result codes disabled
X - Result Code Type
This command determines whichmodem resultcodes areenabled. Additionally,this command
specifies whether busy and dial tone detection are enabled or disabled.
X3 Result codes 0-5, 7, 10 and above enabled. Busy detect enabled and dial tone detect
disabled
X4* Result codes 0-7, 10 and above enabled. Busy and dial tone detect enabled.
Appendix AT Commands MIM-A01
Mitsubishi Industrial Modem 8-11