Thread Subject: Unable to create digitalio object for parallel port

Hi, Folks,

Why do I get the error message:

"??? Error using ==> digitalio.digitalio at 93
Error using ==>
digitalio.digitalio>localCreateDigitalIOObject at 187
Failure to open requested data acquisition device."

after the following command sequence?

------------------------------------------------------
>> daqhwinfo

ans =

          ToolboxName: 'Data Acquisition Toolbox'
       ToolboxVersion: '2.11 (R2007b)'
        MATLABVersion: '7.5 (R2007b)'
    InstalledAdaptors: {3x1 cell}

>> ans.InstalledAdaptors

ans =

    'nidaq'
    'parallel'
    'winsound'

>> dio=digitalio('parallel','lpt1')
??? Error using ==> digitalio.digitalio at 93
Error using ==>
digitalio.digitalio>localCreateDigitalIOObject at 187
Failure to open requested data acquisition device.
-----------------------------------------------------------

Another thing related: the simulink digital output block
does not show the parallel port.

Before someone suggests: I'm an administrator user and the
winio starts up on boot!

Thanks in advance!

"Levy " <levy@pssolucoes.com.br> wrote in message
<fv090a$27m$1@fred.mathworks.com>...
> Hi, Folks,
>
> Why do I get the error message:
>
> "??? Error using ==> digitalio.digitalio at 93
> Error using ==>
> digitalio.digitalio>localCreateDigitalIOObject at 187
> Failure to open requested data acquisition device."
>
> after the following command sequence?
>
> ------------------------------------------------------
> >> daqhwinfo
>
> ans =
>
> ToolboxName: 'Data Acquisition Toolbox'
> ToolboxVersion: '2.11 (R2007b)'
> MATLABVersion: '7.5 (R2007b)'
> InstalledAdaptors: {3x1 cell}
>
> >> ans.InstalledAdaptors
>
> ans =
>
> 'nidaq'
> 'parallel'
> 'winsound'
>
> >> dio=digitalio('parallel','lpt1')
> ??? Error using ==> digitalio.digitalio at 93
> Error using ==>
> digitalio.digitalio>localCreateDigitalIOObject at 187
> Failure to open requested data acquisition device.
> ---------------------------------------------------------
--
>
> Another thing related: the simulink digital output block
> does not show the parallel port.
>
> Before someone suggests: I'm an administrator user and
the
> winio starts up on boot!
>
> Thanks in advance!

Hello
I cannot comment on the error above, but if you intend to
use parallel port for data acq. Then I might suggest you
to use this uility found here
(http://www.usd.edu/~schieber/psyc770/IO32.html). Its very
fast and doesnt require you to have the DAQ toolbox
installed.
HTH
Vihang

The above link got disturbed due to "()", The corrected
link posted here

http://www.usd.edu/~schieber/psyc770/IO32.html

Vihang

Log in as the administrator of the PC, run MATLAB and execute:

daqregister('parallel')

If this succeeds it means the parallel adaptor was
successfully registered and you can log out, log in as
yourself and continue working with the parallel adaptor.

Sherryl

Hi, Sherryl,

It still doesn't work. That's what I've got.

--------------------------------------------------------
>> daqregister('parallel')

ans =

'mwparallel.dll' successfully registered.

>> DIO=digitalio('parallel','lpt1')
??? Error using ==> digitalio.digitalio at 93
Error using ==>
digitalio.digitalio>localCreateDigitalIOObject at 187
Failure to open requested data acquisition device.
---------------------------------------------------------

That happens in two toshiba laptops(one A45 and one A20).
In the desktops, there is no problem!

Thank you!

Thank you, Vihang,

I am going to try this right now!

I also got the same problem and I'm still waiting for
others solution using DAQ Toolbox in Matlab.

Another point I noted:
InstalledBoardIds: {1x0 cell}
In other PC that digitalio can work, the ID should be a
value, not an empty cell.

Hope experts can post your suggestion here.

TQ
Masimet

FYI, I'm using notebook, WinXP SP2.

>> daqsupport
----------Available hardware: ----------
          ToolboxName: [1x24 char]
       ToolboxVersion: '2.9 (R2006b)'
        MATLABVersion: '7.3 (R2006b)'
    InstalledAdaptors: {2x1 cell}

----------Adaptor List----------
    'parallel'
    'winsound'
----------Registering adaptor: parallel----------
Successfully registered parallel adaptor
adaptorInfo =
           AdaptorDllName: [1x69 char]
        AdaptorDllVersion: [1x12 char]
              AdaptorName: 'parallel'
               BoardNames: {[1x25 char]}
        InstalledBoardIds: {1x0 cell}
    ObjectConstructorName: {0x3 cell}

----------Adaptor DLL Name----------
C:\Program
Files\MATLAB\R2006b\toolbox\daq\daq\private\mwparallel.dll