Sounds like the parameters / executive files are lost in the control. When working from a PC to load executive files, you must send to the CNC at 8, 1, None.
Now get this, on a Cincinnati control, the CNC will be set for 8, 1, N but the PC will be set for 7, E, 2. Always match the baud rate. This is for loading and saving NC programs. Drip feed also works but you will need to put line delays in the transmission and or character delays depending on your software and PC.
It would be really nice if all the CNC control builders would get on the same page about RS232 communications and come up with a standard, but then I would be out of business
Greg Mercurio
Shop Floor Automations, Inc.
www.shopfloorautomations.com
(619) 461-4000 Tel