USB-1808X using digital input

[PhilipW]

I’m using the USB-1808X. On the device there are labels for DIO0, DIO1 and GND. I assume that the label refer to digital input 0, digital input 1 and ground.

 

Within the code

 

short[] channelArray = null;

MccDaq.ChannelType[] channelTypeArray = null;

int numberOfDigitalChannels = 1;

 

channelArray = new short[numberOfDigitalChannels];

channelTypeArray = new MccDaq.ChannelType[numberOfDigitalChannels];

 

channelTypeArray[0] = MccDaq.ChannelType.Digital;

channelArray[0] = 0;  // port 0

 

When I call daqBoard.DaqInScan(), I get the exception message “Invalid digital port number”

Is there no port 0?

 

If I use

channelArray[0] = (short)MccDaq.DigitalPortType.AuxPort;  // port 1

 

calling daqBoard.DaqInScan() is successful.

 

I noticed that for enumerated type DigitalPortType, there is no enumeration whose value is 0.

 

How do I access digital Input 0?

 

    public enum DigitalPortType

    {

        AuxPort = 1,

        AuxPort0 = 1,

        AuxPort1 = 2,

        AuxPort2 = 3,

        FirstPortA = 10,

        FirstPortB = 11,

        FirstPortC = 12,

        FirstPortCL = 12,

        FirstPortCH = 13,

        SecondPortA = 14,

        SecondPortB = 15,

        SecondPortCL = 16,

        SecondPortCH = 17,

        ThirdPortA = 18,

        ThirdPortB = 19,

        ThirdPortCL = 20,

        ThirdPortCH = 21,

        FourthPortA = 22,

        FourthPortB = 23,

        FourthPortCL = 24,

        FourthPortCH = 25,

        FifthPortA = 26,

        FifthPortB = 27,

        FifthPortCL = 28,

        FifthPortCH = 29,

        SixthPortA = 30,

        SixthPortB = 31,

        SixthPortCL = 32,

        SixthPortCH = 33,

        SeventhPortA = 34,

        SeventhPortB = 35,

        SeventhPortCL = 36,

        SeventhPortCH = 37,

        EighthPortA = 38,

        EighthPortB = 39,

        EighthPortCL = 40,

        EighthPortCH = 41

    }

[Fausto]

Hello @PhilipW.

For the USB-1808 Series, the Universal Library Help indicates that AUXPORT is the digital ChanArray for the DAQ Input function.  (Note: For digital scanning, the entire digital port must be configured for either input or output when scanning.)  The AUXPORT supports four digital I/O lines (four bits configurable).  You must read the entire port and then break apart the value to determine each digital input channel's value.

 

 

Regards,

Fausto

[PhilipW]

thank you

[PhilipW]

To clarify, a digital port (AUXPORT) consists for 4 digital I/O lines. For the USB-1808X there are 4 screw terminals labelled DIO0, DIO1, DIO2 and DIO3. By default each I/O line has four bits.

The maximum value for the digital port is 16 bits = 2^16 - 1 = 65,535 ?
Can I configure the number of I/O lines are in digital port ?
Can I configure the number of bits in an I/O line ?

Could I configure AUXPORT to only use DIO0 and DIO0 have 16 bits?