ZyXEL Communications U-336R/RE manual Fax Operation, Class 2 Flow Control

Response	Value	Function and Description
t
+FET:n		Post page message response; refer to the
		+FET=n command.
+FHNG:n		Call termination status response.
	n=00	Normal and proper end of connection.
	n=10	Transmit error on phase A hang up code.
	n=20	Transmit error on phase B hang up code.
	n=40	Transmit error on phase C hang up code.
	n=50	Transmit error on phase D hang up code.
	n=70	Receive error on phase B hang up code.
	n=90	Receive error on phase C hang up code.
	n=100	Receive error on phase D hang up code.
+FNSC:"HEX string"		Report the non-standard facilities
		command frame.
+FNSF:"HEX string"		Report the non-standard facilities frame
		response.
+FNSS:"HEX string"		Report the non-standard setup frame
		response.
+FPOLL		Remote polling indication.
+FPTS:n		Receive page transfer status response;
		refer to +FPTS=n command.
+FTSI:"string"		Report remote ID response TSI.
+FVOICE		Transition to Voice response.

Class 2 Flow Control

Flow control is necessary to match the DTE-DCE data rate to the line signaling rate while transmitting or receiving Group 3 (T.4) data. In Class 2 fax mode, both hardware (RTS/CTS) and software (XON/XOFF) flow control are enabled.

62 Fax Operation