Problems with serial.mex

Hello,

I recently read an exchange from February about problems with the serial
port function, and I am having the same (or a very similar problem). I am
also using the Keyspan serial adapter for a USB G4.

I have written a program in RealBasic that sends chr(0) to the serial port.
By monitoring the serial port activity, I know that this works.

Yet, when I send char(0) using Matlab, I have no success. Nothing is sent.
Any number other than 0 works, but sending the null character has no
apparent result.

Any help in this regard would be appreciated!

-JK