Flow Control (FAX Class 1)

Local DC1, DC3 flow control is always enabled if +FCLASS=1 and the modem has a call established. In addition, if RTS is on when the command +FCLASS=1 is issued, then RTS/CTS flow control is also invoked.

This procedure for managing flow control is used because FAX Class 1 specifies the use of DC1, DC3 flow control and allows other mechanisms, but does not make any provision for selecting flow control. FAX Class 1 software does not use the &Kn commands.

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