" jed "in dumb terminal

I have a dumb terminal connected with serial port of PC .the termial is set
as VT100.
I use Qnx6.1.0 system.
I change the file /etc/rc.d/rc.local,add

echo “Setting Serial channel 1 for TTY Login”
stty +edit +fix baud=115200 < /dev/ser1 ".

and the file /etc/config/ttys ,add

ser1 “/bin/login” vt100 on

After I restart the qnx,the terminal can reponse any command as it in PC.

But when I use jed ,the question happened.
I want to use “jed"in the dumb terminal ,but when I enter the command” jed
tmp.c"in the terminal.
YES I enter the jed edit environment.
I want to use the menu about “jed”,so I press F10 key.But there is no
response in terminal. It is lucky that I remember the exit key-combination
can quit from jed.But I can’t open the any menu of jed in terminal,and use
them freely.
I don’t know why.