spi.send with Uint16Array

Well, #2 should work - or: spi.send(new Uint8Array(sData.buffer));

Is it possible that the byte ordering is wrong? I'm not 100% sure but does #2 have the same result as:

for(i = 0; i < sData.length; i++)
  spi.send(String.fromCharCode(sData[i])+String.fromCharCode(sData[i]>>8));

The other option (faster than #1) may be:

sData.forEach(function(s) {SPI.send([s>>8,s]);});

But if #2 (or some variant) will work, that would be ideal.