ProSoft Technology MVI56-BAS - Manual (Page 36)

BASIC Programming MVI56-BAS ♦ ControlLogix Platform
User Manual BASIC Module (DB/BAS Compatible)
Page 36 of 234 ProSoft Technology, Inc.
December 13, 2011
3.3 Using Strings
Strings are a group of characters that can be accessed in a BASIC program or
command line by the following syntax:
$(num)
Where num varies between 0 and 254.
Before using strings, you must allocate enough memory using the
STRING
command:
STRING(A,B)
Where:
A = total number of bytes for the all strings
B = maximum number of bytes for each string
The MVI56-BAS requires an extra byte for each string and an additional
overhead byte.
Example:
10 STRING 307, 50
20 $(0) = "TEST 1"
30 $(1) = "TEST 2"
40 $(2) = "TEST 3"
50 $(3) = "TEST 4"
60 $(4) = "TEST 5"
70 $(5) = "TEST 6"
The
STRING
command allocated space for 6 strings (50 bytes each) plus one byte
for each string and one byte overall.
There are several BASIC CALLs that allow string manipulation. Refer to String
CALLs (page 147).