When using the tcp nodes, does node red convert ascii text to bytes before writing them to the stream? Or do I need to convert the string to a byte buffer before sending the payload ?
It is all the same - they are all bytes down the wire.
Typically sending strings is fine but if you need to be 100% sure, send a Buffer object.
PS, very easy to test - add a pair of TCP-in - TCP out nodes and test it for yourself 
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