8-
5
8
RS-232C interface
3. Communication specifications
3.3
Communication flow control
Software flow control (XON/XOFF) and hardware flow control (RTS/CTS) methods can
be selected by specifying the communication parameters.
3.3.1
Flow control during transmit
XON/XOFF and CTS indicate whether the other party can receive data.
XON/XOFF
RTS/CTS
Flow Control
Yes
No
Temporarily stops transmission when
XOFF is sent from the other party.
Resumes transmission when XON is
sent.
Stops transmission while CTS is OFF.
XON (11H) and XOFF (13H) do not affect
transmission even when they are received.
Stops transmission while CTS is OFF.
3.3.2
Flow control during receive
To prevent overflow when receiving data, XOFF and RST are used to notify the other
party that this end is busy.
XON/XOFF
RTS/CTS
Flow Control
Yes
No
Transmits XOFF when available space
in receive buffer falls below a certain
capacity.
Transmits XON 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.
XON and XOFF are not transmitted.
XON and XOFF are ignored if received.
RTS is always on.
n
NOTE
1) Transmission stops when
transmission is disabled in either
of XON/XOFF or RTS/CTS flow
control.
2) CTS must be on during
transmission regardless of flow
setting. When RTS/CTS is set to
“No”, the CTS should always be
set on. However, if CTS is
connected to RTS of the other
party, CTS may not always be on
causing the transmission to halt,
depending on the other party
specifications.
n
NOTE
The flow controls the functions
separately. For instance, when all flow
controls are set to “Yes” and the
receive buffer capacity is low, an
XOFF is transmitted, and RTS is
turned off. Later, when the receive
buffer capacity is restored, an XON is
transmitted, and RTS is turned on.
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