K8090 Java

Kits PC Related Projects
1

Hello,

I found a thread asking pretty much the same, but no answers. forum.velleman.eu/viewtopic.php?f=3&t=4341

What I am wondering is: Can the Relay card “K8090” be programmed with Java?

I have already created some code in Java, and I want to implement this relay card using my own code.

The thread I found is 6 years old, so there must have been someone between then and now that has developed someting in Java?

If possible, can you link me some sourcecode that I can study for better understanding?

Thank you!

2

There is no ready to use Java library for the K8090 (that I know of)

But serial port communication under Java is possible with the Java RXTX library
rxtx.qbang.org/

That gives you raw communication, but you would still need to implement the K8090 protocol on top of it

3

Fortunately is it possible to use in java with JNA. You must find k8090d.dll because velleman.kits.dll provided don’t working.

Import dll in java like as library (exemple with vm option "-Djava.library.path=“C:/folderWithContainDll”)

Create interface :

import com.sun.jna.Library;
import com.sun.jna.ptr.IntByReference;

public interface IUsbRelais extends Library {

    public IntByReference OpenDevice(String szPort );
    public  void CloseDevice(IntByReference hDevice);
    public  Boolean SendCommand( IntByReference hDevice, int cmd, int mask, int hparam, int lparam );

}

And use it :

relaisDll = (IUsbRelais) Native.loadLibrary(“k8090d”, IUsbRelais.class);
deviceIdentifier= relaisDll.OpenDevice(“COM3”);
relaisDll.SendCommand(deviceIdentifier, CMD_SWITCH_RELAY_OFF,RELAIS_4,0x00,0x00);

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