Omron SYSMAC C200H-ASC02 Operation Manual page 101

Example Programs
Example 17
PC Program
Start
ASCII busy
1, 2, 3... 1.
92
Purpose: To direct processing using different interrupts
MOV
#0010
100
10001 WRITE flag
Remarks:
In this example, a terminal is connected to port 1 and an RS-232C communi-
cation device is connected to port 2. Initially, all the interrupts are disabled.
The program will wait for one of two inputs from the keyboard -- KEY 1 or
KEY 2, each of which will direct the program to process subsequent inter-
rupts in a unique way.
If key 1 is pressed, the COM2 and PC interrupts will be enabled. When
COM2 interrupts the ASCII Unit, a character is read from the communi-
cation device and assigned to the variable A$. When the PC subse-
quently interrupts the ASCII Unit, the character will be written to the PC.
2. If key 2 is pressed, only the COM 2 interrupt is enabled. When COM 2
interrupts the ASCII Unit, the data is read and written directly to the PC.
ASCII Unit Program
10 OPEN #1,"TERM:(42)"
20 OPEN #2,"COMU:(42)"
30 ON KEY 1 GOTO 100
40 ON KEY 2 GOTO 200
50 ON PC GOSUB 300
60 ON COM2 GOSUB 400
70 KEY ON:COM2 STOP
80 GOTO 80
100 'KEY 1 PROCESSING
110 COM2 ON:PC ON
120 GOTO 120
200 'KEY 2 PROCESSING
210 COM2 ON
220 IF A = 1 THEN GOSUB 300
230 GOTO 220
300 'PC INTERRUPT PROCESSING
310 B$ = MID$(STR$(LEN(A$)),2)
320 PC WRITE"@D,0,"+B$+","+B$+"A3";A$
330 A = 0
340 RETURN
400 'COM INTERRUPT PROCESSING
410 IF EOF(2) THEN RETURN
420 A$ = INPUT$ (LOC(2),#2)
430 A = 1
440 RETURN
Section 6-1