G'day guys,
I have an old LS30N lathe with OSP 5000 (green screen). The previous owner had fitted a BTR and we had been using that for many years for transferring programs to and from an early windows PC. I checked the lead wiring and it checks out fine. Interesting it has only three wires used, straight through!

But just recently the coms stopped working both ways! No idea why or how. The machine itself still runs fine its just wont send or receive programs anymore.
Among other things I was thinking could I just dump the BTR altogether and make up a new 25 to 9 pin plug between the PC and the MC? With the correct leads and parameters set is this possible to do on this machine?

I see other machines with this same controller transferring just fine in absence of a BTR. So why would one have been fitted in the first place?

Thanks.