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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(3)
On-demand request processing timing chart
(a) Full-duplex communications
\Cornouter is transmittina data1
On-demand function executing
Xn3
\
\;
PC CPU :/TO
instruction to buffer memory
:',addresses
109H and lOAH
,
?\
---
1) The on-demand function executing signal (Xn3) turns ON imme-
diately and , the on-demand data is transmitted when the on-
demand request is made.
2 )
Transmission of response data (beginning with STX) to the
command data (beginning with ENQ) is suspended until the
completion of on-demand data transmission.
lcomputer is receiving data
On-demand
,'
On-demand function executing
j2,y.'
~
---:,
(4
il
Xn3
,~
~.
-
--
- -
' , , .
(1)
,
1,
,
.
PC c p U
'.,
TO instruction to buffer memory
.;
addresses 109H
a n d
10AH
1) The on-demand function executing signal (Xn3) turns ON imme-
diately when the on-demand request is made.
2)
Transmission of the on-demand data is suspended until the
completion of the response data (beginning with STX) to the
command data (beginning with ENQ).
3) Transmission of the response data (beginning with ACK) from
the computer in response to the response data (beginning with
STX) from the AJ71C24 is possible while the on-demand data is
received.
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