/// <summary>
/// Send "down" command to device.
/// Make sure the device supports this by calling tdMethods() before any calls to this function.
/// </summary>
/// <param name="deviceId">The device id to send the command to</param>
/// <returns>Success or error code</returns>
public static int tdDown(int deviceId)
{
return(UnmanagedImport.tdDown(deviceId));
}