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10.
COMMUNICATIONS IN THE BIDIRECTIONAL MODE
MELSEC-A
(2)
Data transmitting procedure
rocedure (Check sum disabled)
I
Computer
AJ71 C24
length
Send request
Y
( n + r )
0
Send
completed
XnO
PC CPU
TO processing
The send completed
signal
XnO
(program)
Send data length
Turned ONiOFF by program
is
turned
ON
when the response
Data to be send
message is
received.
I
(1) An error occurs if the send data length is (a) greater than the send
area, or (b) equal to "0". In this case, "1" is written as send error
information to the most significant bit (bit 15)
of
address 101 H (data
send error storage area) in the special applications memory area
(see Sections 10.2 and 11.2).
(2)
The send data length written to the head address is transmitted as
the data length.
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