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AT&Pn Select Pulse Dial Make/Break Ratio
This command determines the make/break ratio used during pulse
dialing. The default is country-dependent. The parameter value, if
valid, is written to S28 bits 3 and 4.
AT&P0 Selects 39%-61% make/break ratio at 10 pps.(Default)
AT&P1 Selects 33%-67% make/break ratio at 10 pps.
AT&P2 Selects 39%-61% make/break ratio at 20 pps.
AT&P3 Selects 33%-67% make/break ratio at 20 pps.
AT&Qn Sync/Async mode (external models only)
This command is an extension of the &M command and is used to control
the connection modes permitted. It is used in conjunction with S36
and S48. (Also, see \N)
AT&Q0 Selects direct asynchronous operation. The value 000b is
written to S27 bits 3, 1, and 0, respectively. (See &M0)
AT&Q1 Selects synchronous connect mode with async off-line command
mode. The value 001b is written to S27 bits 3,1,and 0,
respectively. (See &M1)
AT&Q2 Selects synchronous connect mode with async off-line command
mode and enables DTR dialing of directory 0. The value 010b
is written to S27 bits 3,1,and 0, respectively. (See &M2)
AT&Q3 Selects synchronous connect mode with async off-line command
mode and enables DTR to act as Talk/Data switch. The value
011b is written to S27 bits 3,1 ,and 0, respectively. (See
&M3)
AT&Q4 Selects AutoSync operation. The value 100b is written to S27
bits 3, 1, and 0, respectively AutoSync operation, when used
in conjunction with the Hayes Synchronous Interface (HSI)
capability in the DTE, provides synchronous communication
capability from an asynchronous terminal. Starting AutoSync.
Set registers S19, S20,and S26 to the desired values before
selecting AutoSync operation with &Q4.After the CONNECT
is issued,the modem waits the period message of time specified
by S25 before examining DTR. If DTR is on, the modem enters the
synchronous operating state; if DTR is off, the modem
terminates the line connection and returns to the asynchronous
command state. Stopping AutoSync. AutoSync operation is stopped
upon loss of carrier or the on-to-off transition of DTR. Loss
of carrier will cause the modem to return to the asynchronous
command state. An on-to-off transition of DTR will cause the
modem to return to the synchronous command state and either
not terminate the line connection (&D1 active) or terminate
the line connection (any other &Dn command active).
AT&Q5 The modem will try to negotiate an error-corrected link. The
modem can be configured using S36 to determine whether a
failure will result in the modem returning on-hook or will
result in fallback to an asynchronous connection. The value
101b is written to S27 bits 3,1,and 0,respectively.(Default)
AT&Q6 Selects asynchronous operation in normal mode (speed
buffering).The value 110b is written to S27 bits 3,1,and 0,
respectively.
AT&Rn RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if
hardware flow control is selected (see &K command). The parameter
value, if valid, is written to S21 bit 2.
AT&R0 In sync mode. CTS tracks the state of RTS. The RTS-to-CTS
