Remote-processing BASIC 52 Manuel d'utilisateur télécharger pdf (Page 37)

RPBASIC-52 PROGRAMMING GUIDE

2-18

COM

Syntax: COM(port)

Where: port = 0 or 1, the serial com munication port. port may be larger. Check your hardware

manual.

Function: Returns the number of ch aracters received in the specified se rial port buffer.

Mode: Run

Use: A = COM (0)

Cards: All

DESCRIPTION

Use this function in conjunction with GET and COM $ to determine the number of characters to extract from

the serial buffer. A GET 0 data value can be processed with the knowledge that it is a valid character and not

an indication of an empty buffer.

COM$, GET

ERRORS

BAD SYNTAX Any parameters left out

BAD ARGUMENT When port > 1 or card limit or negative

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Remote-processing BASIC 52 Manuel d'utilisateur Page 37