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I'm trying to use Octave and the Instrument Control package to read in serial data through the USB port. Right now I'm just sending test data through the port. Zeros and ones.

I'm getting correct data through the USB when I use screen:

screen /dev/ttyUSB1

I get strange data when I try to use Octave though. I think I'm doing something wrong. Here's an example. I think I should be getting 0 or 1 from srl_read:

> pkg load all
> s1 = serial("/dev/ttyUSB1", 9600)
s1 = 3
> srl_read(s1,1)
ans = 49
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1 Answer 1

up vote 1 down vote accepted

You are reading the ASCII value of "1" from the serial port in this case:

octave:1> x = double ("1")
x =  49

Answer taken from the help-octave mailing list, where the developer of instrument-control answered your question more thoroughly.

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Thanks. The answer from the mailing list works. –  JDD Oct 25 '12 at 11:08

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