Mitsubishi Electric MELIPM Series Instruction Manual page 75

(6) Program example (Switching the operation mode to communication
operation)
10 OPEN "COM1 : 9600,E,8,2,HD" AS #1
20 COMST1,1,1:COMST1,2,1
30 ON COM(1)GOSUB REC
40 COM(1)ON
50 D$= "01FB10002"
60 S=0
70 FOR I=1 TO LEN(D$)
80 A$=MID$(D$,I,1)
90 A=ASC(A$)
100 S=S+A
110 NEXTI
120 D$=CHR$(&H5)+D$+RIGHT$(HEX$(S),2)
130 PRINT#1,D$
140 GOTO 50
1000 REC
1010 IF LOC(1)=0 THEN RETURN
1020 PRINT "RECEIVE DATA"
1030 PRINT INPUT$(LOC(1),#1)
1040 RETURN
General flowchart
Line number
Input file
10
initial setting
to
40
50
Transmission
data processing
Data setting
to
Sum code
calculation
Data
transmission
140
The drive unit does not accept data from the computer if it is in
error. Hence, always insert a data error retry program in the user
program.
Since the communication of any data, e.g. run command, monitor, is
NOTICE
started from the computer, the drive unit will not return data without
the computer's command. For monitoring, therefore, design the
program to cause the computer to provide a data read request as
required.
Initial setting of input file
: Communication file opening
: Circuit control signal (RS (ON in data-receivable
status), ER (unit ready signal)) ON/OFF setting
: Interrupt definition at data receive
: Interrupt enable
Transmission data setting
Sum code calculation
: Addition of control and sum codes
Data transmission
Interrupt data receive
: Interrupt occurrence at data receive
1000
Receive data
processing
to
Interrupt
Data import
Screen display
1040
8-21
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8 PARAMETER FUNCTIONS
8