>Thanks, Jim. Wow, you work on the cnc's too! Anyway, I tried raising the value by increments of 1024 up to 9216. I am getting more of the file, but still a bit less than half. I even tried 16,384 and received the same amount that I got with 9216. I really appreciate your feedback! Thanks...

Yeah, that method only goes so far :-( Are you (or your CNCs) using any handshaking or flow control? Are the files fixed or variable in size? If you have any info on the file format, it would be most helpful...