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10.
COMMUNICATIONS
IN
THE BIDIRECTIONAL MODE
MELSEC-A
(2)
Buffer memory used in the bidirectional mode
(a)
Special applications area
(1
OOH
to
1
FFH)
Wordlbyte dorignation area
for bidirectional mode
Bldiroctional mode rend buffer
memory
area
head addreaa
designation
area
Bidirectional mode rond buffer
memory length dorignation
area
Bidirectional mode receive
buffer memory
area
head
addrosr dosignation
arm
Bidirectional mode receive
buffer memory kngth designa-
tion
area
(k8criptkn
D
The unit (wordlbyte) of data length of
a
mesaago tranrmitttod betwoen
a
tomputor and
a
PC CPU
ir
derignatod with
a
TO instruction in
a
Thir
sob
tho
unit of data
to
be stored in the rond data kngth rtorage
~equonce program.
area
(default addroaa
OH)
and the rocrived data length rtorage area
(default address
80H).
0:
Word (default)
1:
Byte
D
The
head addresr of the area ured for bidirectional mode send buffer
memory area (rend data length storage area and mnd data strage
uea)
is designated with
a
TO instruction in
a
sequence program.
D
The
area
of the designated address is set
as
the rend data length
storage area.
(0
to
FEH
or
20H
to
7FEH
:
Bidirectional rend buifer
memory head addrers. (default
:
OH)
Tho
length of the area used
lor
bidirsctional mode rend
ir
derignated
with a TO instruction in
a
sequence program.
(defautt:
804.
When
OH
to
FFH
area is used,
When
120H
to
7FFH
area
is usod,
2H
to
100H:
Bidirectional send buffer memory
2H to SEOH:
Bidirectional rond buffer memory length
The head address of
the
area ured for bidiroctional mode receive
buffer area (receive data length storage
area
and roeoivo data storage
area) is designated with
a
TO
instruction in
a
soqueneo program.
The
arm
of the derignated addrers is
set
ar
the receive data length
storage
area.
OH
to
FEH 20H
to
7FEH:
Bidirectional mode receive buffer memory
head address. (default:
80H)
The length of the area used for bidirectional mode data receive is
derignated with
a
TO inrtruction in
a
mquenco program (default:
BOH)
.
When
OH
to
FFH
area
is ured,
When
120H
to
7FFH
area
is
uwd,
2H
to
1
DOH:
Bidirectional receive buffer memory length
2H to
SEOH:
Bidirectional recoive buffer memory length
(continued on page
10-6)
10-
5
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