Hy,
my name is Tim and I'am from Germany. First I apologize for my poor school english. I and my father has a small mold and die shop running in Germany and we own three HAAS machines (one with a Mikron VCE sign).
I really like the HAAS machines because of there stability and the excellent price/performance ratio. So on I like the CNC Zone forum ´, especially the HAAS threads because in Germany there are not so much users that use the opportunities of the internet.
I used the search in the cnczone intensively without an answer for my problem.
Now I have a big problem with our Serial data transmission. Normally we use the "XModem" Protocol for downloading to the machine memory and for DNC mode on the newer HAAS machines (VF2 with 15k spindle without Ethernet and a VF2SS). The results are perfect! We do not have any problems with the highest baud rate (115.200 Baud/s , 8 Databits 1 StopBit, No Parity) and the transmission never collapse.
But with our dnc software I do not found any possibility to use "XMODEM" also for uploading from the machine. The problem seems to be the start sign from the machine and the answer sign (which do not comes I thought) from the software.
So when I have to upload some programms I switch the settings to "XON/XOFF" with the same baudrate 8Databits 1 Stopbit and Even Parity. I need the high baudrate because the programs are very large and the cable length is smaller then 2 Meters.
So yesterday I had the "worst case". I download an earlier uploaded NC Code to the machine and start it. It was hardened steel (1.3343) and after the machine cuts some steps down it rans right across the part with a full width cut of 5mm in Z => a 20mm "Depo" Cutter breaks!! Luckily I stood in front of the machine and could stop it. So the problem was a wrong sign when uploading with "XON XOFF". The NC Code was a 3D surface finishing with many G1 code.
The correct code was:
...
X15.991 Y17.785
X16.107 Y17.794
..
The error code was:
...
X15.991 Y17.785
X1E9 Y17.794
..
The result was that the machine DO NOT move to X16.107, it move to X0.001 => a disaster!
So that this problem NEVER occur anymore I'm searching a solution for uploading with the preferred "XMODEM" protocol. Can anybody tell me if it is possible and if it is what settings? And what software do you use? We use SDNC from Surfware. But I also tried it with Hyperterminal without success.
Thank you very much for your help!!
Best wishes from Germany!
Timm