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5. NON
PROCEDURE
PROTOCOL
COMMUNICATIONS
MELSEC QnA
5.5.4
Summary of data transmission from PC CPU using non proce-
dure Drotocol
The following uses an image diagram to outline the PC CPU data transmission procedure using
the non procedure protocol described in Section
5.5.3.
When X0 is turned ON, the PC CPU
sets the number of words of send data
to DO and the send data to D l -D4.
When X1 is turned ON, the PC CPU
executes the instruction and wrltes
the data to the buffer memory
(400H-404H).
External devlce
X0 ON
1
fi
Monltor
GPPQ
0
*When the Request to Send signal is turned ON, the QC24 sends the data to the external
device.
@
When the QC24 finishes sending the data, it turns ON the *End of Transmission signal (X80) to
the PC CPU and completes one data transmission.
*
: The OUTPUT instruction automatically turns the QC24 Request to Send and End of Trans-
mission signals ON and OFF
by
internal processing.
PC CPU
QC24
I '
I
I 1
'
-
End of Transmission
' @ ' B uffer
memoly
I
+
Externai devlce
5 - 1 3
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