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5. NON
PROCEDURE
PROTOCOL
COMMUNICATION
MELSEC QnA
5.1 Non Procedure Protocol Control Procedure
The following describes the control procedure contents when CH1 uses the non procedure pro-
tocol to send and receive data.
Data transmission from PC CPU to external device
Transmission order
External device
The 0 2 2 4 sends the data received
device as
IS.
QC24
from the PC CPU to the external
Send data
End
of
Transmission
(XnO)
1
Sending
(Xn2)
A
Request to Send (YnO)
\
PC CPU
rocessing
Reception of data from external device at the PC CPU
Transmission order
e
External device
Receive data
QC24
Request to Read (Xn3)
End of Receptlon W n l )
1
To
turn ON the Request to Read signal (Xn3)
...
The QC24 turns ON the Request to Read signal when it receives any of data
@
to
@
below
from the external device.
@
When end code written to
@
When the number
of data
@When user frame data received
buffer memory (A5H) received
written to the buffer memory (See Section
5.6 for a description
(A4H)
received
of
user
frame.)
4
+
Number of data
5 - 2
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