Xylem System 5000 BASIC Manual - Manual (Page 30)

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slot$ = “SLOT2”
GETVALUE DIFF34, var REM stores a new quadrature counter measurement of
REM ports 3-4 from the daughterboard in the var
REM variable
GETVALUE ANALOG1 slot$, s$ REM stores a new analog measurement of
REM channel 1 from Slot 2 in the s$ string
REM variable
CLEARSDI() REM Clear any cached SDI values for this time period
GETVALUE SDI01, a1$ REM request a new measurement (address 0, param 1)
GETVALUE SDI02, a2$ REM retrieve the second parameter
CLEARSDI() REM Force our next request to be a new measurement
GETVALUE SDI01, b1$ REM request a new measurement (address 0, param 1)
Specifies a variable as being global and retrieves any previously stored value. A global variable
allows any Basic program access to retrieve, modify, or update the contents of the variable. Global
values are only retrieved if the variable is initialized with the GLOBAL keyword. Newly declared
global variables are initialized to 0 if they are a number or “” if they are a string. In similar fashion, to
delete a global variable, simply set its value to 0 if it is a number or “” if it is a string.
REM Maintain a running average of the Battery
GLOBAL Global_var
GETVALUE BATT, battVolt
REM If Global_var hasn’t been created, use our retrieved value
IF (Global_var == 0) Global_var = battVolt
Global_var = (Global_var + battVolt) / 2
GLOBAL
Branches to the specified label or line number within the program. Once a RETURN statement is
reached, execution is passed back to the statement immediately following GOSUB. Subroutines,
defined with the SUB command, provide a much more flexible method of executing and running
portions of code and should be used instead of GOSUB.
h = 3
w = 4
d = 5
GOSUB 100
GOSUB ComputeArea
PRINT “Area: “, area REM prints “Area: 12”
END
LABEL ComputeArea
area = h * w
RETURN
100
volume = h * w * d
PRINT “Volume: “, volume REM prints “Volume: 60”
RETURN
GOSUB
BASIC COMMANDS & FUNCTIONS