usb relay 4 in matlab

You can control USB relay 4 in MATLAB by using the Instrument Control Toolbox. You will need to install the package for USB relay and the software development kit (SDK) for USB relay4. Once these are installed, follow the below steps:

Load the library for USB relay 4:


main.m
loadlibrary('path/to/library/D3xxLibrary.dll','path/to/header/D3xxLibrary.h');
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Connect to the USB relay:


main.m
relay_handle = calllib('D3xxLibrary','OpenDevice','serial_number');
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Set the relay states:


main.m
calllib('D3xxLibrary','SetRelayMode',relay_handle,4,0); % makes sure all relay outputs are in closed condition (low level)
calllib('D3xxLibrary','SetRelay',relay_handle,relay_number,1); % set the relay in high level / open state
calllib('D3xxLibrary','SetRelay',relay_handle,relay_number,0); % set the relay in low level / closed state
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Close connection and unload library:


main.m
calllib('D3xxLibrary','CloseDevice',relay_handle);
unloadlibrary D3xxLibrary
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Make sure to replace "path/to/library" and "path/to/header" with the actual file paths on your system, and "serial_number" with the actual serial number of your USB relay 4 device. Also replace "relay_number" with the number of the relay you want to set.

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