Mitsubishi Electric MELSEC-A Manual Book page 41

4. DATA COMMUNICATIONS
USING DEDICATED PROTOCOLS
MELSEC-A
1450 LOCATE 27, 8
:
PRINT 'D$='
:
D$
1460 LOCATE 7,12
: PRINT 'LIST OF PRESENT VALUES OF D O TO 04'
1470 FOR l%=l TO 5
1480 DAT%=VAL (.6H*+MID$(D$, (1%-1)'4+1, 4)) :
'
Data
(four
hexadecimal digits) is converted into decimal.
1500 LOCATE 15,14+1%
1520 NEXT I%
1530
.
GOT0 'FIN
1540
1
I
....__...._________...-..-...-..---------
Data in Case of reception error is displayed.
__.__________
I
1490 DNO%=I%-l
:
'
Data register number.
1510 PRINT USING 'Dit=####' ; DNO%, DAT%
"One-point
advice"
T
1 3 8 0
IP
25 characters
Weived data BUFS
The details of the line numbers 1320 and 1380 in the
program are as follows:
1320 IF BUF$xSTX$ THEN RVCNT%=STCNT%-1
As soon as the computer receives the STX
code from the AJ71 UC24, it sets 25 repre-
senting the number of characters (data
remaining to be received.
IF LEFTS(BUF6, 5)=STX$+'OOFF' AND RIGHT$(BUFS, 1)
=ETX$ THEN +DISP
The first five characters
o f
the data received
from the AJ71 UC24 are arranged as shown
in the left figure.
If
the last character is the
ETX code, the program jumps to the line
labelled
'DISP.
4 - 14