Synxcom SM9234D, User Manual

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AT Commands
Page 154
specified by register S7 expires, the modem generates the NO CARRIER message
and returns to command mode. If a V.21 carrier is detected when a high speed
carrier is expected, the modem generates the +FCERROR message and returns to
the command mode. If the specified carrier is detected, the modem generates the
CONNECT message and enters the data receive mode.
While in data receive mode, the modem receives data from the remote, adds start
and stop bits, and handles <DLE><chr> character pairs before passing the data to
the DTE. The modem prefixes each <DLE> character with another <DLE>
character before sending it to the DTE.
If the modem detects a receive buffer overflow condition, it stops receiving from
the remote until there is room in the receive buffer. The modem informs the DTE
of the buffer overflow after it sends to the DTE the last character that was stored
in the buffer before the overflow occurred.
If the modem receives any character from the DTE after the +FRM command
(except flow control characters if software flow control is in effect), or if the
modem detects a high-to-low transition of the DTR signal while &D1 is in effect,
it sends <DLE><ETX> to the DTE, generates the OK result code, and returns to
command mode. The receive buffer is cleared and all data received from the
remote is discarded. If loss of DTR is detected while &D2 is in effect, the modem
goes on-hook, sends <DLE><ETX> followed by OK result code to the DTE, and
returns to command mode. If the modem detects a DTR drop while &D3 is in
effect, the modem performs a warm reset.
Commands and Parameters
Mode Entry Commands
+FCLASS=1 - Select Facsimile Class 1 Mode
+FCLASS=1 selects the Fax Class 1 Mode. The Fax Class 1 Mode commands and
responses described in this section are applicable when cFCLASS=1 as
shown in Table A-18.
+FCLASS=1.0 - Select Facsimile Class 1.0 Mode
+FCLASS=1.0 selects the Fax Class 1.0. The Fax Class 1.0 Mode commands and
responses described in this section are applicable when cFCLASS=1.0
as shown in Table A-18.