Problem setting up serial console

[galgot]

I’ve been trying to set up a serial console via a Keyspan USB twin-port RS422 adapter, from a PB5300c(7.6.1) to an iMac G5 (tiger) to get the iMac shell on the Powerbook with Zterm or Black Night. I’ve installed the Keyspan drivers and configured the iMac as per these helpful pages, here :

http://www.applefool.com/se30/#serialdata
and here :
http://a2central.com/2126/apple-ii-to-mac-intelligent-serial-terminal-file-transfers/
 
Problem is, it works only once after I reboot the iMac. When I mean once, is that if I cut the connection after the first successful one, and try another one , like say quitting Zterm on the Powerbook then relaunching it to try another one or trying one with Black Night, it fails. I get nothing, no shell…
If I want it to work again, I have to reboot the iMac, but it’ll work once only :-/
Also, at every iMac boot, I get some permission errors on the Keyspan driver in the terminal, like so :
 
Welcome to Darwin!
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
stty: /dev/cu.USA28X2b1P1.1: Permission denied
Walter-Sobchak:~ galgot$
 
I’ve tried chowning the drivers to my user (they are owned by root by default) , but it does nothing.
Also tried changing the drivers permissions to 666 (they are crw -—- ——- by default) , still no joy. 
Also tried using tty.USA28X2b1P1.1 driver instead of cu.USA28X2b1P1.1… nope
 
any idea what I'm doing wrong?
 
Other than that , file transfert works fine via Zterm installed on both machines...

 

[galgot]

Never mind… I removed all the "stty ..." entries in the /etc/profile file , and it now works. Even with quitting , re-logging and all

 Pretty sure I had tried that too before, but anyway...