Measurement-computing Serial488A Instrukcja Użytkownika Pobierz pdf (Strona 59)

4.10

4.8 IEEE to Serial Applications

The following program uses a

Serial488A

as an interface to a serial instrument

or host computer. The IEEE controller is an IBM PC running GWBasic with the

IOtech Personal488™ controller package. Communications are provided under direct

interaction from the keyboard.

In this program example, key presses are detected and sent via the IEEE bus to

the

Serial488A

. The character is then sent to the serial device. Any incomming serial

characters are buffered by the

Serial488A

. The

Serial488A

is polled by the controller

for any data in the serial input buffer. When data is detected, it is read by the

controller one character at a time and printed on the PC's screen. The IEEE address of

the

Serial488A

is 10.

10 ' Open Driver488 Files and initialize

20 OPEN "\DEV\IEEEOUT" FOR OUTPUT AS 1

30 IOCTRL #1,"BREAK"

40 PRINT #1,"RESET"

50 OPEN "\DEV\IEEEIN" FOR INPUT AS 2

60 ' Look for PC Key Press

70 K$ = INKEY$

80 IF K$="" THEN GOTO 110

90 ' Output Key Press to Serial488A

100 PRINT #1,"OUTPUT 10;";K$;

110 ' Test for Serial data

120 PRINT #1,"SPOLL 10" : INPUT #2,SPOLL

130 IF NOT (SPOLL AND 16) THEN GOTO 70

140 ' Enter One Byte From Serial488A and print it

150 PRINT #1,"ENTER 10 #1" : S$ = INPUT$(1,1) : PRINT

S$;

160 GOTO 120 ' Try for more

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 84 85

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Measurement-computing Serial488A Instrukcja Użytkownika Strona 59