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5.1.2 DATA Message Format
There are one or more DATA messages used to store a data file. The for-
mat of the DATA message is designed to be generated by a BASIC ‘PRINT’
statement and read by a BASIC ‘INPUT’ statement.
DATA messages - Line 2: onwards
data C/R L/F
data = up to 252 characters coded in Hexadecimal (2 characters per data
logger
byte).
The characters are
sent
high order 4 bits followed by low order
4 bits such that the following BASIC instructions would have VALUE as the
first data logger byte in the ASCII DATA message (STRING$)
VALUE = VAL
("&H"
+
LEFT$(STRING$,2))
5.1.3 END Message Format
A single line is used to terminate the data file.
END message -
END C/R L/F
5.2
HOST COMPUTER PROGRAM TO RECEIVE DATA
The following sample BASIC program
will
save the information sent by the
COPY program via the RS-232 communications link. The sample program
is written for an IBM-PC type system, however a similar program will
operate on any computer.
10 INPUT “Enter Filename for COPY data”;F$
20 OPEN
F$
FOR OUTPUT AS
#2
30 OPEN “COMl:1200,n,8,2,rs,cs,ds,cd” AS #l
40 INPUT #1,A$
50 IF A$ = “END” THEN 100
60 PRINT #2,A$
65
PRINT A$
70 GOT0 40
26 Section 5. DATA STORAGE FORMAT