c
C..
c
c
-.
rr
L-
L.
L
I
L.-
P
-._
R
r
II
c
L..
c
c-.
P
10.
COMMUNICATIONS
IN
THE BIDlRECT!ONAL
I:
.
..*.
,
,.:
MODE
MELSEC-A
10.5 Bidirectional Communications Basics
10.5.1 Contra
protocok
Protea01
(1) Check sum exi8t8 only when
"0'
i8
sot to addrerr 115H of buffer memory.
(2) Check sum is calculated Win
the
ana indicated by
'1.
(3)
The AnlC24 roturns an NAK 1mmedi.tely
H
it
detects an
error
ar in
'2
while communications is
data ha8 been received.
made
in
tho full-duplex mode. In half-dupkx modo communication,
it
returns an NAK
only
after
the
The AJ71C24 ignorer receive data if
it
detect8 an error (Section
10.3.3
(5)).
Therefore, it does not
give
a
received data read request to the PC CPU.
10-
13
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