Re: Working with secondary addresses

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On Wed, 25 Mar 2026 at 01:12, John <[email protected]> wrote:

>
> I get the following error:
>
> $ ./test_storage.py
> Traceback (most recent call last):
>   File "/home/johnc/Test/linux-gpib/./test_storage.py", line 27, in
> <module>
>     gpib.write(cmd_find, b'\x31\x0D')
>     ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
> gpib.GpibError: write() failed: You have attempted to write data or
> command bytes, but there are no listeners currently addressed.
>
> The script uses the same technique that worked in Perl so not sure what I
> am doing wrong at this point:
>

Your code looks fine. This is not a python issue, it is hardware related.
The problem with the device you are talking to is in one or more of:
1) Not plugged into the bus
2) Not powered on
3) Device is hung
cheers,
-Dave

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote g=
mail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, 25 Mar =
2026 at 01:12, John &lt;<a href=3D"mailto:[email protected]">subs@qc=
ontinuum.plus.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex"><u></u>

 =20
   =20
 =20
  <div>
    <p><br></p>
    <p>I get the following error:</p>
    <p>$ ./test_storage.py<br>
      Traceback (most recent call last):<br>
      =C2=A0 File &quot;/home/johnc/Test/linux-gpib/./test_storage.py&quot;=
, line 27,
      in &lt;module&gt;<br>
      =C2=A0 =C2=A0 gpib.write(cmd_find, b&#39;\x31\x0D&#39;)<br>
      =C2=A0 =C2=A0 ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^<br>
      gpib.GpibError: write() failed: You have attempted to write data
      or command bytes, but there are no listeners currently addressed.<br>
      <br>
    </p>
    <p>The script uses the same technique that worked in Perl so not
      sure what I am doing wrong at this point:</p></div></blockquote><div>=
<br></div><div>Your code looks fine. This is not a python issue, it is hard=
ware related. The problem with the device you are talking to is in one or m=
ore of:</div><div>1) Not plugged into the bus</div><div>2) Not powered on</=
div><div>3) Device is hung</div><div>cheers,</div><div>-Dave</div></div></d=
iv>

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