Yes it does. Apparently the voltage levels on the pins 0 and 1 do not work for ttl. Rs232. When I jumper the tx pin on the header going to the Macintosh USB cable header on the arduino board to the Rex pin on the programming port on the reciever board the signal get there okay.
What kind of circuit do I have to use to get the pins 0 and 1 to have the correct voltage levels to communicate.