It seems that the conversion between String to Bytes is not accurate inside
the serial Library. When I convert the String to a Byte[], it works fine,
but using String with char as char a = (char)129 --> 0x39 is sent (?)

Could it be a problem with Java to C unsigned conversion?

It has been tested on windows XP with arduino on P5v124.
Serial Lib is dated: 04-02-2007

[code]
////////////////////////
String s;

for(byte i=0; i<50; i++)
s += (char)(i+124);

com.write(s);

(input s) --> |}~?�???????????�?��????????????�?? ¡¢£¤¥¦§¨©ª«¬­
(output)---> |}~???????????????????????????????? ¡¢£¤¥¦§¨©ª«¬­



////////////////////////
////////////////////////
String s;

for(byte i=0; i<50; i++)
s += (char)(i+124);

for(int i=0; i<s.length(); i++)
com.write((byte)s.charAt(i));



(input bytes) --> |}~?�???????????�?��????????????�?? ¡¢£¤¥¦§¨©ª«¬­­
(output)---> |}~?�???????????�?��????????????�?? ¡¢£¤¥¦§¨©ª«¬­
[/code]

*** Bug 575 has been marked as a duplicate of this bug. ***

*** Bug 576 has been marked as a duplicate of this bug. ***

sending chars will be subject to the conversion depending on what your
platform is using. send bytes instead.