Remote-processing BASIC for the CX-10 Modbus Manual de usuario descargar pdf (Pagina 11)

BASIC PROGRAMMING GUIDE

2-2

ASC

Syntax: ASC(

ASCII character

)

ASC(

string,position expr

)

Where:

ASCII character

= number from 0 to 255

string

= any valid string variable

position expr

= 1 to length of string

Function: Returns or sets the integer value of an

ASCII character

or the character in

string

position expr

Mode: Command, run

Use: PRINT ASC(C)

ASC($(3),1)=48H

C = ASC($(0),P)

DESCRIPTION

The ASC operator either sets or returns the value of an ASCII character. Use ASC to evaluate, change or

manipulate individual characters in a string.

The first syntax returns the value of an ASCII character. If

ASCII character

were the letter 'B', a 66 is

returned. Basic converts any lower case variable symbols to upper case. Lower case characters must be put

into a string to be evaluated.

The second syntax, shown under Use, sets a character in a string to a specific value. This is useful when you

want to manipulate individual characters in a string.

The third syntax returns a value in

string

position expr

. This form is useful when you want to evaluate

individual characters in a string, such as generating a checksum.

CHR, STRING

ERROR

SYNTAX Attempt to convert an improper value.

EXAMPLE

The following example prints ASCII values from the string $(0). The first 3 characters are modified at lines

70 to 90. The result is then printed.

10 STRING 200,20

20 $(0)="abc123"

30 FOR N=1 TO 6

40 PRINT ASC($(0),N),

50 NEXT

60 PRINT

70 FOR N=1 TO 3

80 ASC($(0),N)=65+N

90 NEXT

100 PRINT $(0)

READY

>RUN

97 98 99 49 50 51

BCD123

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 83 84

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