P-
C.
c
t-
L
L
c
c
10.
COMMUNICATIONS
IN THE
BIDIRECTIONAL
MODE
MELSEC-A
(3)
Data area
The data of OOH to
FFH
code can be processed in a string of l-byte
data as the send data.
(a) Data send from an AJ71 C24 to a computer
The data area to be transmitted is the value written to the send data
storage area
of
the AJ71C24 buffer memory by the TO instruction
in a sequence program.
The AJ71 C24 transmits the data according to the designated length
and byte/word units sequentially from the lower address in un-
changed codes.
(b) Data send from a computer to an AJ71 C24
The data area received is written to the received data storage area
sequentially from the lower address in unchanged codes as they
are received.
The data length to be written is determined by the data length
in
the received message and the designated word/byte units.
(4) Check sum
The check sum
is
the lower
2
bytes (16 bits) of the result obtained by
adding the data length and the data area in the message as binary data.
If
the setting at address 115H is "l", the check sum is not required.
(a) Data send from an AJ71C24 to a computer
The AJ71C24 calculates and adds the check sum.
If
the check sum is not processed, the check sum is not transmitted.
10- 15
.
-.
.
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