Have querky problem with ISO program transfer, both machine and PC are talking to each other sending programs in both direction. Sending from the machine to the PC the transfer is absolutely fine. However when sending from the PC to the machine, is where the problem occurs.

1) The progam takes for ever to upload, upto 10 mins for 20 or so lines, an hour for a 100 or so lines of program and in excess of 3 hours for 300+ lines.
2) The fisrt 7 - 10 lines are dropped and have to be put in manually.

Anyone have ideas.

It's not a buad rate problem.
It's nat a software problem (SEIKI NMS4 transfer prog) as this is used on Geiss 5 axes Routing machines with Seimens 840M & 840C, Bridgeport machines with vaious Heidenhain controls & Hitachi Seiki Lathes with Fanuc OT controls.

Exactly the same thing occurs on our OKK machine with Mazak M32 control.