Reading signed data from RS232
2 ビュー (過去 30 日間)
古いコメントを表示
Hi,
I want to read 256 signed numbers from RS232. In Hyperterminal I see:
-54
-54
-54
-52
-55 . . . But when I read it in Matlab I saw something like that:
out=fread(s)
45 53 52 13 13 10 45 . . .
And if I convert "out" to char (val=char(out)) I haven't got 256 numbers, I have 45...I know that this problem is due to conversion into ASCII characters..
Can anybody give me a solution to read correctly the data?
0 件のコメント
回答 (2 件)
Chirag Gupta
2011 年 4 月 19 日
Instead of using fread, try using fscanf where you can specify the format.
0 件のコメント
Ankit Desai
2011 年 4 月 20 日
You can provide the precision that you want to use with fread.
-Ankit
1 件のコメント
Walter Roberson
2011 年 4 月 20 日
Ankit, if you examine char([45 53 52]) you will find it is '-54' so the problem is not the precision the variables are written at, but rather that the data is being ASCII encoded and needs to be converted back to numeric form.
参考
カテゴリ
Help Center および File Exchange で Workspace Variables and MAT-Files についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!