Campbell Scientific CR1000 Measurement and Control System - Manual (Page 238)

Section 7. Installation
238
Table 39. String Concatenation Examples
Expression Comments Result
Str(1) = 5.4 + 3 + " Volts" Add floats, concatenate strings "8.4 Volts"
Str(2) = 5.4 & 3 & " Volts" Concatenate floats and strings "5.43 Volts"
Lng(1) = "123" Convert string to long 123
Lng(2) = 1+2+"3" Add floats to string / convert to long 33
Lng(3) = "1"+2+3 Concatenate string and floats 123
Lng(4) = 1&2&"3" Concatenate floats and string 123
7.8.13.3 String NULL Character
All strings are automatically NULL terminated. NULL, Chr(0) or "", counts as
one of the characters in the string. Assignment of just one character is that
character followed by a NULL, unless the character is a NULL.
Table 40. String NULL Character Examples
Expression Comments Result
LongVar(5) = "#"-"" Subtract NULL, ASCII code results 35
LongVar(6) = StrComp("#","") Also subtracts NULL 35
Example:
Objective:
Insert a NULL character into a string, and then reconstitute the string.
Given:
StringVar(3) = "123456789"
Execute:
StringVar(3,1,4) = "" "12356789"
Results:
StringVar(4) = StringVar(3) "123"
But,
StringVar(3) still = "12356789",
so,
StringVar(5) = StringVar(3,1,4+1)
'"56789"
StringVar(6) = StringVar(3) + 4 + StringVar(3,1,4+1)
'"123456789"
Some smart sensors send strings containing NULL characters. To manipulate a
string that has NULL characters within it (in addition to being terminated with
another NULL), use MoveBytes() instruction.