It occurred to me that the BTR that had been previously fitted to the machines tape reader would act as a breakout board between the PC and the MC and thus perhaps isolating the machine's R232 card? Anyway I went ahead and made a new serial cable (going around the BTR) based on "theokumaguy's" specific 5000L instruction which differ from the 5000 L-G see here
https://www.cnczone.com/forums/okuma...ml#post2297532 .
Only thing I differed on is a made the cable 9 pin at the PC side as the PC has no 25 pin port. I just wired the 9 pin to match the 25 pin features.
I changed the parameters to SRT MIke's settings, #1: 00011011 and #12: 10100010
After all the above a now have the MC able to transfer to the PC with no issues. However when I try to transfer the other way I get a device error FFFFFF.
I feel im getting closer.
I will continue to report my finding and package what I did. It may help others in the future. Keeping these old 5000L machines alive is important to me....well not really but anyway! hahaha