I am planning to control Delta VFD-B using RS232 to RS485 converter and 
LinuxCNC, Modbus. Manual of the drive: 
http://www.delta.com.tw/product/em/drive/ac_motor/download/manual/VFD-B_manual_en.pdf

I feel cold when coming near to Ladder logic (I am an IT specialist, 
programmer). Maybe I will learn it one day and feel as comfortable as 
programming in C..
So I was thinking starting from 
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Modbus.

BTW, which of these methods would be lighter on CPU recources?

Maybe someone went this way already and could share some sources, configs?


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