Remote Processing BASIC 52 - Manual (Page 37)

RPBASIC-52 PROGRAMMING GUIDE
2-18
COM
Syntax: C O M (port)
Where: port = 0 or 1 , the seri al com mun icatio n port. port may be la rger. Check yo ur hardware
manua l.
Function: Returns the n umber of ch aracters receive d in the specified se rial port buffer.
Mode: Run
Use: A = COM (0)
Cards: All
D E S C R IP T I ON
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 bu ffer.
RELATED
COM$, GET
ERRORS
B A D S Y N T A X Any parameters left out
B A D A R G U M E N T When port > 1 or card limit or negative