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4. COMMUNICATIONS USING A DEDICATED PROTOCOL
MELSEC QnA
X0 to X7 batch read
'ST1
lnitlalize
r-7
RS-232C OPEN
Send command
0401
(subcommand
0001 :
blt
units)
4-
'RECEIVE
Recelve request count
1
character
I
I
'RECl
.
Store the received 1 character
data to BUF$.
'
When BUF$=STX$,
19 characters
When BUF$=NAK$,
14 characters
4
"Received data
- - - -
T
*FIN
RS-232C CLOSE
* , - - - ,
,
- _ ,
,
Label name used with the program
4
-
22
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