Hello all,
My previous question [1] is not clear.

My idea is create hal drive (hal_serial) for pc com port:
PC <=COM=> Microcontrol board (MC51 for example)

Protocol:
- PC read 8bits from Microcontrol boad, for read status of limit switch,
emergency stop button etc.
- PC write 8bits to Microcontrol boad, for on/off some things ( spindle,
pump etc.)
- Read/Write task will continue in forever loop.

Step control by lpt or other.

[1] http://sourceforge.net/p/emc/mailman/message/32442282/

-- 
Trần Ngọc Quân.


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