Xylem System 5000 BASIC Manual - Manual (Page 34)

Returns a string, starting from the left side, containing the given number of characters from the
given string.
var$ = “Hello World”
new_var$ = LEFT$(var$, 6) + “Universe” REM stores “Hello Universe”
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LEFT$ (string, number)
Returns the length of the given string.
var = LEN(“Hello World”) REM stores 11 in var
LEN (string)
Reads an entire line from an open file.
OPEN “SiteID.csv” FOR APPENDING AS #1
LINE INPUT #1 b$ REM retrieves a single line and stores it in b$
CLOSE #1
LINE INPUT
Used as a parameter to the OPEN command, attaches to the listening port associated with the
program. The port can be either a serial (COM) port or network (Ethernet) port and is configured
using the touch screen interface under the Listening Ports Setup screen. Opening the Listener port
enables communication between the System 5000TM and the connecting device.
OPEN “LISTENER” AS #1
INPUT #1 “\r” 2000, cmd$ REM check for a command
IF (cmd$ == “Analog1”) THEN
GETVALUE ANALOG1, val
PRINT #1 “Analog1: “, val
ENDIF
CLOSE #1
LISTENER
BASIC COMMANDS & FUNCTIONS
Returns the natural logarithm of the given number. The LOG function should be used if a common
(base-10) logarithm is required.
var = LN(3) REM stores “1.09861”
var = LN(5) REM stores “1.60944”
LN (number)