I'm currently running a lot of contouring on my VMC1000.Some of the file sizes are coming in +20 megs. I am drip feeding at 115 kps thru Remo, but lets say a 20 meg file is 4 hours of run time, it takes 10 hrs to drip feed at that baud rate. No cool. My question is, I tried to run without out block numbers, thinking this might save upwards of 30% of file size but I get an error. In ISO mode can the Heid 426 run without block numbers? If so what does my header and footer of the file have to look like? Or is it a parameter issue?