On LabWindows/CVI, there is the function called nxWriteFrame. This function allows you to send some frames from a master to a slave. In the Help page, under Description, there is an explanation of how to use the Frame Output Stream Mode. As explain on the picture, to send only the header, you must set the payload length value to 0. By doing this, you will only send the header. If the payload length is a value different from 0, you will send the header and the values.
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