How to write chords with MIDI?

How do I write a chord, i.e. a NoteOn of seveal开发者_开发问答 notes on each above the other at the same time line?

What should be the message for this chord.

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MIDI is a serial interface, so you can't actually send two 'Note On' commands at the same time - you physically send them one after the other, but the latency is low enough that although they start playing sequentially, the ear cannot detect the delay.

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You can also use MIDI SYSEX. Syntax of SYSEX Message vary from synthesizer to synthesizer, for instance Yamaha PSR Series Keyboard uses XF Chord Events (which is SYSEX based).