Re: [CAD_CAM_EDM_DRO] Re: serial vs parallel port

ccq@... wrote:

>On Tue Nov 4 22:22:06 2003 Don Rogers wrote:
>
>
>
>>>Dear group can EMC use the RS232 port (serial) instead of the printer
>>>port?
>>>
>>>
>You're forgetting that there's a lot of old, now cheap, terminal server cards,
>SCSI terminal servers and what not out there. I have one of the later, and it
>seems to me that 8 serial and one parallel port could do a lot, especially at
>115200 KBaud. That's also plenty to have some sync signals left over. Of
>course, the hard/software hand shaking signals could be made to do a lot, too.
>figure an axis per port, and go from there. One could be running a mill and a
>lathe simultneously, and have room left over for a lot of things.
>
>

These termial servers have NO guarantee of timing whatsoever! You can't
even begin to think about controlling a real-time process with such devices.
There could be tenths of a second gaps in the data flow the way these units
work.

Jon