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1. Serial communications Basics
1.5 Syntax
Characters
In this manual, all characters are expressed using the C- language syntax:
decimal values ddd
2
hexadecimal values \xhh
3
The characters t hat can be used are
For text fields: "ABCDEFG HIJKLMNOPQRSTUVWXYZ0123456789+-/&@#_:;ab cdefgh ijklmn op qrstuvwxyz”
For filenames: "? *ABC DEFG HIJK LMNOPQRSTUV
WXYZabcdefghijklmnop qrstuvw xyz0123456789_ -"
Negati ve values /numbers
The 2s complement number system is use
d 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
\x0b
’h’
\x68
’e’
\x65
’l’
\x6c
’l’
\x6c
’o’
\x6f
\x20
’w’
\x77
’o’
\x6f
’r
\x72
’l’
\x6c
’d’
\x64
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’
\x68
’e’
\x65
’l’
\x6c
’l’
\x6c
’o’
\x6f
\x20
’w’
\x77
2. ddd=0...255
3. hh=00...ff
R5976884 RLM SERIES 04/04/2006 9
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