8.
COMMUNICATIONS USING
DEDICATED
PROTOCOLS
(b) Half-duplex communications
1
i
IComputer is transmitting datal
(2)
On-demand data
On-demand function executing
Xn3
instruction to
buffer
memory
resses
109H
and
lOAH
1) The on-demand function executing signal (Xn3) turns on imme-
diately when the on-demand request is made.
2) Transmission
of
on-demand data is suspended until the comple-
tion of command data receive (beginning with
ENQ)
from the
computer.
3)
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
The on-demand function executing signal (Xn3) turns
ON
imme-
diately when the on-demand request is made.
Transmission of the on-demand data is suspended unil
the
completion of the response data (beginning with
STX)
to the
command data (beginning with
ENQ).
Transmission of the response data (beginning with ACK) from
the computer in response to the response data (beginning with
STX)
from the AJ71C24 should be made after
the
completion
of
on-demand data receive.
J
dl
1
I
i
i
d
,,n
1
I
1
i
7
J
8-108
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