Bonjour, Je dois lire un octet d'une valeur supérieur à 127, Labview me retourne 27. Dans l'aide j'ai vus que Labview ne donne une description ASCII que pour des valeurs allant jusqu'à 127. Comment doisje m'y prendre ? Labview 6.1Windows XP Hello, I want read an byte with a value up to 127, but Labiew reurn a value arround 27 How I must do ?

Rigide wrote: Thank for your help. I do change lyke I understood (my english is quiet poor...) I have an other programme who comunicate with the instrument. I know that the 6° byte must be higher than 18 (upper than 7F in fact). But with Labview I have only 18. While it might be higher than x18, an I8 is signed, and therefore it cannot be higher than x7F - it has a range of -128 to 127. A U8 is unsigned and therefore it has a range of 0 to xFF. However, x18 is the same value whether you treat it as signed or unsigned. I don't see how LabVIEW could be reading a wrong value over the serial port. Are you sure you are looking at the correct byte? Your code shows that you are splitting the string twice. Are you sure you are doing that correctly? Since you are running on Windows you can double-check the received string by using PortMon. This allows you to see what is actually being received by the serial port driver of Windows. P.S. I was actually referring to the To Byte Integer function.

Instrument Control (GPIB, Serial, VISA, IVI)

Read octet with value up to 127 Lire octet avec valeur ASCII supérieur à 7F (127 déc)

Solved!

OK. Post back if you need more help. One possibility is that you're actually supposed to be dealing with a 16-bit value.

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Instrument Control (GPIB, Serial, VISA, IVI)

Read octet with value up to 127 Lire octet avec valeur ASCII supérieur à 7F (127 déc)

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