User guide

Modem Emulation AT Command Set
268 Chapter 3 Modem Emulation Commands
ATO
Return to on-line data mode. If the modem is in the on-line command mode,
the modem enters the on-line data mode. If the modem is in the off-line
command mode (no connection), ERROR is reported.
• O0, O1: If there is an active connection, switches the modem to data
mode.
OKn = 0 or 1
and a
connection
exists.
ERROR
Otherwise or if
not connected.
ATQn
Quiet results codes control command. The command enables or disables
the sending of the result codes to the DTE according to the parameter
supplied. The parameter value, if valid, is written to S14 bit 2.
• Q0: Enables result code to the DTE (Default).
• Q1: Disables result code to the DTE.
• Q2: Disables “CONNECT” result codes.
• Q3: Disables “CONNECT” result codes on incoming connections.
OK n=0 or 1
ERROR
Otherwise
ATSn
Read/Write to the specified S-Register.
• n Establishes S-register n as the last register accessed.
• n=v Sets S-Register n to the value v.
• n? Reports the value of S-Register n.
See "S-Register Definitions" on page 269 for definitions of S-Registers.
OK n=0 or 1
ERROR
Otherwise
ATVn
The verbose setting for result codes. This command selects the sending of
short-form or long-form codes to the DTE. The parameter, if valid, is written
to S14 bit 3.
• V0: Result codes are issued in numeric or short form. Line feeds are not
issued before a short-form result.
• V1: Result codes are issued in text or long form. This is the default.
OK n=0 or 1
ERROR
Otherwise
ATZ
Load configuration. Reloads the S-register configuration from flash memory.
See "S-Register Definitions" on page 269 for definitions of S registers.
OK n=0 or 1
ERROR
Otherwise
AT&Cn
DCD option. The Digi device controls the DCD output in accordance with
the parameter supplied. The parameter value, if valid is written to S21 bit 5.
• &C0: DCD remains ON at all times.
• &C1: DCD follows the state of the connection.
OK n=0 or 1
ERROR
Otherwise
AT&Dn
DTR option. This command interprets the ON to OFF transition of the DTR
signal from the DTE in accordance with the parameter supplied. The
parameter value, if valid, is written to S21 bits 3 and 4. Also see S25.
• &D0: DTR drop is ignored (assumed ON).
• &D1: DTR drop is interpreted by the modem as if the asynchronous
escape sequence had been entered. The modem returns to command
mode without disconnecting.
• &D2: DTR drop causes the modem to hang up. (Default.)
• &D3: DTR drop causes the modem to do a soft reset, as if the ATZ
command was executed.
OK n=0 to 3
ERROR
Otherwise
AT&F
Restore factory configuration. The device reloads the factory default S-
register configuration from flash memory. The factory defaults are identified
for each command and in the S-Register descriptions. A configuration
consists of a subset of S-Registers.
OK n=0 or 1
ERROR
Otherwise
AT
Command
Function
Result
Code