Service Class 2 Action Commands - Multitech SocketModem MT5600SMI Reference Manual

Service Class 2 Action Commands

These commands transfer data, and punctuate sessions. They also release specific T.30 messages. All
action commands must be the last command on a command line as indicated by the terminating <CR>.
All action commands initiate processes. The modem will not accept other commands from the DTE until
the modem issues a final result code (e.g., OK, CONNECT). The modem will abort the process if it
receives any character before the final result code is issued.
Command: ATD
Syntax:
If this command is unsuccessful, the DCE reports an appropriate failure or error type result code such as
NO CARRIER, NO DIAL TONE, or BUSY (see S-Parameters).
If this call is successful, the typical DCE response is:
ATDnn..nn (go off-hook, dial, get CED)
+FCON (DCE detects flags)
[+FCSI:<remote ID string>]
+FDCS:<T.30 subparameter string>
OK
The DCE dials, detects call progress, and generates the CNG tone. It then waits for a DIS frame. On
detection of the first Phase B preamble (V.21 ch. 2 modulated by 300 bps HDLC flags), it reports the
"+FCON" message to the DTE. The DCE then switches to 19200 bps.
The DCE generates a DCS frame based on the received DIS frame and on the previously set +FDIS
parameter. A +FDT command from the DTE releases the DCE to transmit that DCS frame.
The DCE reports the initial received T.30 negotiation messages, including the DIS frame and the optional
CSI ID string. The +FDIS: report is followed by the OK final result code.
Command: ATA - Answer a Call
The DCE can support a DTE command to answer an incoming call using the ATA command (see Data
Commands).
The DTE may issue an Answer command in response to an incoming ring.
If the Answer command is unsuccessful, the DCE will report an appropriate failure or error type result
code, such as NO CARRIER (see S-Parameters).
Manual Call Answer
If this call is successful, the typical DCE response (answer and receive) is:
+FCON
[+FTSI:<remote ID string>]
+FDCS:<T.30 subparameter string>
OK
(DTE should issue +FDR command here)
Upon receipt of an Answer command from the DTE, the DCE answers and generates the CED tone. The
DCE then generates a DIS frame (derived from the +FDIS parameter) and hunts for the first T.30
negotiation frames. Upon detection of the first Phase B preamble (V.21 ch 2 modulated by 300 bps HDLC
flags), it reports the "+FCON" message to the DTE.
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306C)
Originate a Call
ATD....<CR>
The DCE can support a DTE command to originate a call using the ATD
command (see Data Commands).
Chapter 3 – Fax Class 2 Commands
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