Thanks, we thought that parity was disabled, but we'll double check that. Meanwhile, my colleague found a program that did the job of sending a binary file out the COM port with no problems. It's called Tera Term. I'm not sure, because he got it from another colleague, but it may be the free program posted at http://www.ayera.com/teraterm/.

Quote Originally Posted by Darrel Taylor View Post
It's hard to say, but it sounds like parity is enabled in hyperterminal.