Mitsubishi Electric MELSEC FX Series User Manual page 118

FX communication
4 ) Example program of programmable controller
M8002
M8000
M20
5 ) Example program of computer
This is an example of a BASIC program for communication of RS instruction communication
(no protocol communication). This BASIC program is written by not know overseas.
10 C LO S E #1 :A $="40"
20 O P E N "C O M 1:" A S #1
30 P R IN T #1,A $
40 C LO S E #1 :F O R I=J T O 2000:N E X T *1
50 O P E N "C O M 1:" A S #1
60 F O R I=1 T O 100 *1
70 IF LO C (1)>=4 G O T O 10 0
80 N E X T
90 C LO S E #1 :P R IN T "T IM E O U T E R R O R ":E N D
100 B $=IN P U T $(LO C (1),#1)
110 P R IN T B $
120 E N D
*1 This counter is used for waiting time of receiving data from PLC. Please change setting
value of counter for personal computer CPU speed.
FNC 40
ZRST
FNC 12
FNC 80
D10
RS
M8123
FNC 15
BMOV
D0 D11
H 048F D8120
MOV
K4 D0 K4
D0 D10 K2
M20
PLF
M8123
RST
M8122
SET
END
T ext of A S C II stored.
C O M 1 port is opened.
D ata is sen t to P LC .
Length of received data is check ed.
R eceived d ata is displayed.
RS instruction 9
Sending data and receiving data
reset. #
Setting communication format.$
b15
0000 0100 1000 1111
0 4
RS instruction drive. (
The receiving data (D0, D1)
moves to sending data area
(D10, D11). )
+
Receive completion reset ,
Send request *
b0
8 F
9-16