You need a null modem cable : One serial interface on your computer (PC)
Connect this cable from your PC to your rs232 port (on the telestrat).
Use Hyperbasic cardridge :
It means Your data will be loaded in #1000 address.
On your PC, with linux type :
stty -F /dev/ttyS0 -icrnl igncr ignbrk -brkint -inlcr -inlcr -ixoff -ocrnl -onlcr -onlret -onocr
cat mydata > /dev/ttyS0
On your telestrat :
CTRL + C
It will print the last address filled by your data