7.
INITIAL
SETTING
OF
TRANSMISSION
CONTROL
DATA
TO
BUFFER
MEMORY
MELSEC-A
7.4.2
Spectfylng no-protocol
recehre
completion
data
kngth
(ftxed
kngth)
How to complete the data receive and set the data length are given below
along with a sequence program example.
iettlng
Method]
b15 to
bO
Buffer memory address 108H
Write
the
amount
of
received
data
(default
121
wds)
'OINTS]
(1)
Set the length of data to complete the data receive
in
the following
ranges:
Length of data received
s
no-protocol mode buffer size (when word
units are set)
Length of data received
s
no-protocol mode buffer size
x
2
(when
byte units are set)
If the received data length is larger than the no-protocol mode buffer
size, then it is automatically set equal to the no-protocol mode buffer
size.
(2)
Section
7.4.3
describes the selection of a word or byte unit for the
data length to complete data receive.
(3)
If
the receive-completed code is set, the read request for the received
data is transmitted when the completed code or the set data length
(whichever comes first) is received.
(xnl
is
ON)
(4)
To
read the received data by fixed length without setting the com-
pleted code, do the following setting:
Write FFFFH.
I)(:
to
b8'
to
FbO,
Write
the
length
of
received data
Buffer memory address 1
OOH
Buffer memory address
108H
(default
:
121
words)
ixrmple
I
To
set the fixed length at which data receive
is
complete to
15
words
in
the case
of
the
read of received data only by fixed length
(AJ71C24
I/O
addresses
80
to
9F)
(Sequence Program)
1-
TOP
I
H8 HI00 HFFFF
K1
To
specify
the
fixed length, write HFFFF
to
buffer memory address
1
WH.
I
TOP
H8 H108
K15
K1
~
Write
'15'
to
buffer memory address 108H.
7-
10
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