sends an XOFF signal to tell the computer to stop sending
data; once your printer is able to accept data, it sends an
XON signal to notify the computer to resume sending data.
RTS
It is hardware flow control that uses dedicated wires
to handle data transmission. When the computer is ready to
send data to your printer, it sends a Request to Send (RTS)
signal to your printer. If your printer is able to accept the
data, it sends a Clear to Send (CTS) signal to the computer.
That is, the computer starts sending data when it sees CTS
on; it stops sending when it sees CTS off.
None
No control is used for the handshake.
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