Control.com - Nerds in Control

I am planning to use modbus protocol for communication in my system, but my master controller is FPGA. I have searched on net that if anyone have done it before but most of them have done it using some processor core. I just want to have an opinion that if it is possible to implement it without using any processor or controller core.

I am pretty sure, it is possible. But I am not very sure how you would go about it and how much time it would take. All protocols need libraries and function calls and the likes. In FPGAs you would have to build your own libraries and then call them from your source.

I think you should read some implementation notes on Modbus.org to see if they have existing libraries used for FPGAs and Micros etc. I did a DNP3 algorithm based on MFC class and that was a tough cookie. I am sure implementing Modbus on a FPGA or the likes would be a very time consuming ordeal.