Result Codes (FAX Class 2.0)


The modem connect result codes are the normal data modem result codes when it connects as a data modem and FAX result codes when it connects as a FAX modem. This behavior is required to comply with [1] and [2].

Reference [1] names the following result codes, which can be used in numeric or verbose format. 
Numeric   Verbose           Meaning                                                 

                                                                                    

                                                                                    

0         OK                Ready for another command.                              

                                                                                    

                                                                                    

1         CONNECT           The modem is entering the data transfer state.          

                                                                                    

                                                                                    

3         NO CARRIER        The modem is ready for a command; the modem may not be  

                            on hook.                                                 

                                                                                    

                                                                                    

4         ERROR             Last command could not be executed; modem is ready for  

                            another command.
The connect result code is always CONNECT without regard for the modulation speed, which is selected by the DTE. All other modem commands and result codes are allowed.

If the DCE detects a received tone different from that specified by a +FRM or +FRH command, then it sends the result code +FCERROR to the DTE and returns to command state. The numeric equivalent to +FCERROR is +F4.

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