Using a USB SSR-24 board

[Maylar]

• Trying to communicate with a Measurement Computing SSR-24 relay board. It's just an array of 24 relays and I can't find any examples on how to turn them on/off.
• Using code that I have from other MCC devices I've tried to configure the ports as outputs (though that is a dip switch function) and I get an error that says "This digital port is not configurable (it's an In/Out Port)". Trying to use DaqBoard.Dout() says the port is not configured correctly for the requested operation. OK. So how do I talk to this thing?
•  
• Thanks
• Dave 

[Fausto]

Hello @Maylar.

If you are developing with the MCC Universal Library for Windows, then the UL Help is the preferred resource for supported functions of each MCC device.

 

The USB-ERB08 and USB-SSR08 are very similar in design. One uses dry contact relays, and the other uses solid-state relays. 

Take a look at the examples in this link:  https://files.digilent.com/#downloads/example_programs/Product_Specific_Examples/USB-ERB08/

 

Related forum posts:

 

 

 

Regards,

Fausto

 

[Maylar]

Thank you very much.

Dave

 

[Maylar]

Another question about using the relay board...

The DaqBoard has been initialized 

DaqBoard = MccDaq.DaqDeviceManager.CreateDaqDevice(boardNum, inventory[boardNum]);

boardNum is zero (only one device is present). No errors doing this so far. The board shows up as BoardNum 0, and BoardName as "USB SSR-24".

I have a method to read the current value of one of the ports:

public int GetDIO_PortValues(MccDaq.DigitalPortType PortName, out short CurrentValue)
        {
            // get the current digital output values of a DIO port
            ULStat = DaqBoard.DIn(PortName, out CurrentValue);

            if (ULStat.Value != ErrorInfo.ErrorCode.NoErrors)
                return ERROR_SSR24;
            else
                return ERROR_NONE;
        }

If I step into this code and break on the first statement, hovering the cursor above DaqBoard gives an error dialog:

And another that says Invalid board number. This is even before the statement is executed. The code is contained in a class library that I have created, and the DaqBoard should be valid and defined at this point in the scope. Any ideas what could be going on here?

 

Thanks

Dave