According to Chelton's wiring diagrams RS232 output from the Freeflight 1101 is on pin 8.  Looking at the Freeflight documentation it shows two RS232 outputs; TX1 on pin 8 and TX2 on pin 7.  Freeflight's diagram of a typical installation shows connecting to TX2 on pin 7.  I called Freeflight and their tech support said to use pin 7 (TX2).  They said TX1, pin 8, is a maintenance port and does not output data in normal operation.

For those of you with working Chelton/Freeflight installations, which Freeflight connector pin are you using for RS232 output?

Tom Gourley