Disklavier

Allan,

You may actually be closer than you think.  You may want to try a 
null modem.

The quick answer:

A null modem is a short serial cable that simply connects pin 2 on 
one end (the transmit data pin) to pin 3 on the other end of the 
cable (the receive data pin) and vice' versa.

A little more detail if your interested..

Actually there are a couple more pin changes that also take place in 
a null modem.  Normally two devices that "talk" to each other over a 
serial interface have some type of "communications" device (like a 
modem) in between them.   The communications device handles switching 
the information coming from the "send data" wire on one end to 
the "receive data" wire on the other end. Normally two devices that 
are "speaking" to each other have some other data that they send and 
receive (called a handshake).  The communications device (modem) 
normally handles switching these around as well. 

Technically, a data terminal device (DTE) is typically connected to a 
data communications device (DCE).  This is what a standard serial 
cable in designed for.  However, you can connect to DTE devices 
together with a 'null modem' that switches the appropriate wires to 
make it look like there is a DCE device in between.



A summary of all this is is that you may want to run to your local 
computer store and find a "null modem" with the appropriate 
connectors.  It should only be a few dollars for this short cable and 
they are pretty common.  

The best thing that can happen is that it will clear up your problem 
and you can send MIDI data to you disklavier.  The worst that will 
happen is that can happen is this won't clear up your problem and 
you're out a couple of bucks for a null modem.

Good luck and let us know how it works out.

Brian