Can not detect the DIO signal ???

[ASIAN INSTITUE]

Hi all,,

Help me,, Help me

I connected the position detection sensor, load cell  to DAQ- PCI6259 via counter input and analog input pins respectively. I used the same power supply for the sensors. I got data aldreadly for both Anolog and Digital Inputs. However, I did not notice that , some time I changed Power supply in level 9 V for both Digital and Analog signals.

Now,, I could not get data from Digital Inputs.When i check the input voltalte at pins:

1. ON : Pin 17- Ground : 5V

2. OFF : PIN 17- Grounf : 2V ( It usually is 0V )

Is the problem caused by the much high voltage supplied for DIO???

Please help me

Thuong

[Elijah_K]

Thuong,

I'm not sure I quite understand the problem you've described.  I understand that you have inputs that you're trying to read via the counter and the analog channels and that you were succesful the first time you tried.  Correct me if I'm wrong, but the problem you've run into is that when you apply more than 5V that the card doesn't read correctly?  The fact is that the maximum input range for the digital input is 0 to 5V, so I wouldn't recommend applying 9V.  I would recommend dividing down the voltage.

[ASIAN INSTITUE]

Thank you for your reply. You undestood my problem correctly. It works properly right now due to I changed the power supply to 3 V.

I have a question is When the Pulse is OFF (0 V) , the Voltage measured at 2 pin inputs is still near 1.3 V ( The power supply is 3 V) ??

Regards,

Thuong

[Elijah_K]

What voltage does it read when you connect the input to ground?  Are you allowing enough time for the reading to settle before measuring?  Does it read 1.3V when it's on?