!
F
i
'1
r-
--
c
t
?-
I
L1
P
c..
(This is the on-demand function of the
AJ71
C24.
It
is
availabte
only when one computer is connected to one PC CPU.)
*
1
:
The dedicated protocols consist of four different protocols.
The term 'dedicated protocols' used in this manual is the col-
lective term for these protocols.
(2)
Communications
in
the
no-protocoVbidirectiona1
modes
Either the no-protocol mode or the bidirectional mode can be set.
(a) Communications in the no-protocol mode
1)
Data communications can be initiated by a PC CPU
Data communications can be initiated
by
a computer or any PC
CPU. Data can be transmitted from a PC CPU to an external
device by using the
TO
instruction
in
the sequence program to
write data to the buffer memory.
Data transmitted from an external device can
be
read by a PC
CPU using the
FROM
instruction in the sequence program.
The following example shows a system with a printer, CRT and
keyboard terminal connected in a
1 :1
ratio. Data can be output
from the buffer memory to the printer or a CRT display using the
TO instruction. Data input from the keyboard to the buffer
memory can be read using a
FROM
instruction from the PC CPU.
r
-
TO
instruction
(write) (Send)
Printer, CRT, computer
PC CPU
FROM
iMtruction
AJ71
C24
Computer, keyboard
L
(F-Q
2) Receiving data length can be set to variable or fixed:
The Length of
the
data transmitted from an external device and
received by the PC CPU can be set to variable or fixed.
i)
Receiving variable-length data:
Data receive stops when the receive completed code set by
the user is received.
ii)
Receiving fixed-length data:
Data receive stops when the fixed length of data set by the
user is received.
Both the receive completed code and the receive-completion
data length can be freely set by the user.
3)
Variable communications memory area
The
user
memory
area can
be
allocated to suit the purpose and
application of the data transmission.
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