XON/XOFF communications problem on serial port

Hello!

I don't know if this is the right email to send my question to, but I have
tried on a couple of linux mailinglists and noone seems to know the
answer. To my question...

I have an VT 510 terminal connected to a linux PC (three wire cable MMJ
<-> DB9). I have set the port to use XON/XOFF communications and tell it
to operate at 115200bps. When I send like 100 lines to the terminal with
the echo command I can see errors on the terminal (the error characters
are like question marks, but turned upside down). If I connect the
terminal with the same cable to a Windows 2000 PC everything works fine -
no errors on the terminal. What could cause such behavior?

[root@gdom root]# stty -a < /dev/ttyS0
speed 115200 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2
= <undef>; start = ^Q; stop = ^S; susp = ^Z;
rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon
ixoff -iuclc -ixany -imaxbel opost -olcuc -ocrnl onlcr -onocr -onlret
-ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok
-echonl -noflsh -xcase -tostop -echoprt echoctl echoke
[root@gdom root]#


P.S.: My system is a Compaq Deskpro with RH 7.3 and kernel 2.4.21 on it.

I would apriciate if you could help me or point me to the right address.

Thanks for your help and have a nice day.

Greetings from Slovenija,

	Andrej.