User guide

Modem Emulation AT Command Set
Chapter 8 Modem Emulation 40
ATNn Accepted but ignored. OK n=0 or 1
ERROR Otherwise
ATOn
Return to On-Line Data Mode.
This command determines how the modem will enter the 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 Enters on-line data mode. Handling is determined by the Call Establishment task.
Generally, if a connection exists, this command connects the DTE back to the remote
modem after an escape (+++).
O1 Same as above
OK n = 0 or 1
and a connection
exists.
ERROR
Otherwise or if not
connected.
ATP Accepted but ignored. OK
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
OK n=0 or 1
ERROR Otherwise
ATSn Read/Write 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.
ATT Accepted but ignored.. OK
ATVn Result Code Form. 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 Enables short-form (terse) result codes. Line feed is not issues before a short-
form result.
V1 Enables long-form (verbose) results codes (Default).
OK n=0 or 1
ERROR Otherwise
ATWn Accepted but ignored. OK n=0 to 3
ERROR Otherwise
ATXn Accepted but ignored. OK n=0 to 3
ERROR Otherwise
ATYn Accepted but ignored. OK n=0 or 1
ERROR Otherwise
ATZn Accepted but ignored. (Soft Reset and restore Profile). OK n=0 or 1
ERROR Otherwise
AT&
Commands
AT&Cn DCD Option. The Digi Device Server 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 is ignored (assumed ON). Allows operation with DTEs which do not
provide DSR.
&D1 DTR drop is interpreted by the modem as if the asynchronous escape sequence
had been entered. The modem returns to asynchronous command state without
disconnecting.
&D2 DTR drop causes the modem to hang up. Auto-answer is inhibited. (Default.)
&D3 DTR drop causes the modem to perform a soft reset as if the Z command were
received. The &Y setting determines which profile is loaded.
OK n=0 to 3
ERROR Otherwise