Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 270)

100

101

Chapter

Call Routines 69–127

13 -12

Use CALL 84 to transfer up to 40 words starting at the designated offset of

the DH-485 Common Interface File to the BASIC module input buffer

starting at the same designated offset from word 0.

This call does not interrupt nor is it interrupted by a DH-485 read or write

from or to the DH-485 common interface file.

Input and Output Arguments

This routine has two input arguments and one output argument. The first

input argument is the starting offset in the DH-485 Common Interface File

and the BASIC module input buffer (100 to 139). The second input

argument is the length in words to be transferred (1 to 40). The output

argument is the status of the call:

0 = successful transfer

1 = illegal starting offset; transfer does not take place

2 = illegal length; transfer does not take place

Syntax

PUSH

starting word offset in DH-485 interface file

PUSH number of words to be transferred

CALL

POP transfer status

Example

REM EXAMPLE PROGRAM

40 PUSH 0 : REM OFFSET ADDRESS = 0

50 PUSH 32 : REM WORD OFFSET = 32

60 CALL 84 : REM TRANSFER THE DATA TO THE BASIC INPUT BUFFER

70 POP R : REM GET THE OUTPUT ARGUMENT

80 IF (R<>0) THEN PRINT “TRANSFER ERROR CODE = ”,R

>90 REM PRINT ERROR

CALL

84: T

ransfer DH-485

Common Interface File to

BASIC Input Buffer

1 2 ... 265 266 267 268 269 270 271 272 273 274 275 ... 393 394

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