voltage negative

[leeou]

 I use the DAQ NI6703 for output voltage negative by  using Matlab , I   used putsample function  putsample(ao,-1); however ,I cannot output the voltage negative.  I have tested the NI6703 by NI MAXmx, it fonctionne correctly.

this is my code :

%-------write to a NI 6703 DAQ device---------%

%-------------Initialization------------------%

%--------------analog Output------------------%

 ao=analogoutput('nidaq','Dev2');

 %-------Adding Channels----------------------%

 %-------Analog Output------------------------%

 addchannel(ao,0);

 %--------write data--------------------------%

 ao_value =-1;

 putsample(ao,ao_value);

 %----cleaning Up------%

 %waittilstop(ao,5)

 delete(ao);

 clear ao;

[CindyF]

Hi Leeou,

I am not familiar with Matlab but I think this forum can help you:

How do I use the PCI 6703 digital outputs with Matlab xpc

http://forums.ni.com/t5/Multifunction-DAQ/How-do-I-use-the-PCI-6703-digital-outputs-with-Matlab-xpc/...

Bye

[johnsold]

Cindy,

I think Leeou is referring to the analog outputs, not the digital ouputs.

Lynn

[leeou]

thank you for your response, I have fund my problem, and your information is alos useful for me.

[leeou]

Proven Zealot,

yes I refer to  analog output, I fund  the problem is that I need to use the funtion:

ao.Channel(i).OutputRange=[-10 10];

thank you

leeou