I understand, I saw this spmu013 board some months ago. Now SPI is best for interconnection inside circuit, I2C standalone with PC is best (but I need 14 controller so quiet tough), And Of course distance between PC to controllers in many conditions is more than 1meter so USB is also tough. I saw ENC28J60 PIC Ethernet after your suggestion. I can connect it through SPI to motor controller, LAN can be easily controlled to 14 ports with switch then to PC 1gbps port. Then by TCP programming in C# for PC and C for micro-controller I can control 14 controllers simultaneously.
I think this will best of all solution.
---------- Post added at 05:18 ---------- Previous post was at 05:17 ----------
I understand, I saw this spmu013 board some months ago. Now SPI is best for interconnection inside circuit, I2C standalone with PC is best (but I need 14 controller so quiet tough), And Of course distance between PC to controllers in many conditions is more than 1meter so USB is also tough. I saw ENC28J60 PIC Ethernet after your suggestion. I can connect it through SPI to motor controller, LAN can be easily controlled to 14 ports with switch then to PC 1gbps port. Then by TCP programming in C# for PC and C for micro-controller I can control 14 controllers simultaneously.
I think this will best of all solution.