Communication Flow Control; Flow Control During Transmit; Flow Control During Receive - Yamaha RCX222 User Manual

3. Communication specifications
3.3

Communication flow control

Software flow control (XON/XOFF) and hardware flow control (RTS/CTS) methods can be
Chapter
7
selected by specifying the communication parameters.
n
NOTE
When fl ow control is set to "XON/XOFF" or "none", CTS status does not affect
transmission. RTS is always on.
When fl ow control is set to "RTS/CTS" or "none", receiving XON and XOFF does
not affect transmission.
When fl ow control is set to "none", part of receive data might be lost.

3.3.1 Flow control during transmit

Data transmission temporarily stops when the other party's device is in receive busy
status.
Communication parameter
XON/XOFF
RTS/CTS
None

3.3.2 Flow control during receive

This notifies the other party's device that the controller is in receive busy status.
Communication parameter
XON/XOFF
RTS/CTS
None
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Operation during transmit
Stops transmission when XOFF (13H) is received.
Resumes transmission when XON (11H) is received.
Stops transmission while CTS is off.
Does not perform flow control during transmit.
Operation during transmit
Transmits XOFF (13H) when available space in
receive buffer falls below a certain capacity.
Transmits XON (11H) when receive buffer is empty.
Turns RTS off when available space in receive buffer
falls below a certain capacity.
Turns RTS on when receive buffer is empty.
Does not perform flow control during receive.