Synxcom SM9234D, User Manual

Page: 171 / 216

AT Commands
Page 171
DCE to DTE Streams
The DTE must filter the data stream from the DCE, and remove all character pairs
beginning with <DLE>. The DTE must recognize <DLE><ETX> as the stream
terminator. The DTE must recognize <DLE><DLE> and reinsert a single <DLE>
in its place.
The DCE filters stream data to the DTE, and inserts extra <DLE> characters
ahead of data.
Auto Answer
The DCE can answer as a data DCE or as a fax DCE. It can answer the call
adaptively, i.e., it can determine whether the call is 'data' or 'fax'. The +FAA
parameter controls this feature. Fax adaptive answer operates only when
+FCLASS=0.
AT+FAA=1 ; Auto answer as a facsimile or a data modem depending on the call
CONNECT XXXX ; DCE status response if data call
+FCON ; DCE status response if fax call
Identification of T.30 Options
Group 3 devices negotiate session parameters in DIS, DCS, and DTC frames.
These parameters are defined in Table A-23.
Session Status Reporting
The DCE provides reports to the DTE on the status of a session. The DCE
provides the following status reports:
1.
Connection and hang up status:
+FCON
+FHNG:<0-255>
2.
Requested DIS session paraFDIS: <string> reports remote facsimile
capabilities.
Syntax: +FDIS: VR, BR, WD, LN, DF, EC, BF, ST
3.
+FDCS: <string> reports the negotiated parameters