Barco RS232 - Manual (Page 11)

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 \x hh
3
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 \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