Thanks for ur help.
I set everything the same as in Hyperterminal. and yesterday I tested the communication with VXI in MAX. the command sent works with device. But this program still doesn't work.
I have some doult that eg. the command that I have to send is
home\r
mov 500000\r
when I use Labview program I have to write ("home") ? or don't use double quotation mark.
Another point that I found is after I use port com1 with labview, then I shut down Labview and come back to Hyperterminal again, it like the port busy with other thing and can't type anything to com1.
Do you have any recommend for this ?
Thank you very much for your help.. 🙂