Hey guys 94 Ht20sii Siecos L multi screen Yasnac Lx3 control

Struggling to get this thing to input programs via rs232 . Not sure if there a parameter or setting im missing.
I don’t see anything on the NC side for inputting a program.
On the multi side I go to editing, select option 2 program input and shows some rs232 settings, I’ve been trying from this screen with no luck.

I’ve played with baud rates, data and stop bits like I’m playing with lottery numbers and I haven’t managed to get things to talk to each other.

Any help is appreciated