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1.5
Syntax
Characters
In this manual, all characters are expressed using the C- language syntax:
decimal values
hexadecimal values
The characters that can be used are
For text fields: "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+-/&@#_:;abcdefghijklmnopqrstuvwxyz"
For filenames: "?*ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_ -"
Negative values /numbers
The 2s complement number system is used to express negative numbers
Pascal- language string
A Pascal-language string consists of one or more characters. The first character of the string contains the length of the string.
Therefore, a Pascal-language string is limited to 255 characters.
Pascal string 'Hello world"
length
'h'
'e'
'l'
'l'
'o'
"
'w'
'o'
'r'
'l'
'd'
C-language string
A C-language string consists of one or more characters. The last character of the string is always the NULL character \x00. There-
fore, the length of a C-language string is determined by the position of the NULL character..
C string 'Hello world"
'h'
'e'
'l'
'l'
'o'
"
'w'
2. ddd=0...255
3. hh=00...ff
R5976884 RLM SERIES 04/04/2006
2
ddd
3
\xhh
\x0b
\x68
\x65
\x6c
\x6c
\x6f
\x20
\x77
\x6f
\x72
\x6c
\x64
\x68
\x65
\x6c
\x6c
\x6f
\x20
\x77
1. Serial communications Basics
9
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