7-
5
7
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, DSR 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, DTR 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”, 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 function 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.
Summary of Contents for RCX40
Page 1: ...User s Manual ENGLISH E YAMAHA 4 AXIS ROBOT CONTROLLER E75 Ver 12 00 RCX40 ...
Page 2: ......
Page 16: ...viii MEMO ...
Page 18: ...MEMO ...
Page 24: ...1 6 MEMO ...
Page 26: ...MEMO ...
Page 34: ...MEMO ...
Page 284: ...MEMO ...
Page 308: ...5 24 MEMO ...
Page 310: ...MEMO ...
Page 318: ...6 8 MEMO ...
Page 320: ...MEMO ...
Page 328: ...7 8 MEMO ...
Page 330: ...MEMO ...
Page 336: ...MEMO ...