8.
COMMUNICATIONS USING
DEDI-
PROTOCOLS
(3) On-demand request processing timing chart
(a) Full-duplex communications
IComputer is transmitting data]
I
/c4
On-demand data
MELSEC-A
\(1)
/
On-demand function oxoouting
0
instruction to
buffer
memory
ddrerres
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.
IComputer is receiving datal
(3)
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 AJ71 C24 is possible while
the
on-demand data is
received.
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