AX3100S controller: how to control it

I\'d like to use two AX3100S controllers in order to control my two DC motors installed on my mobile kart which has to move on sand ground.

Each DC motor has these specifications:

Volt = 24VDC
Current = 50A for 40 min.
P = 1000W

Do you think AX3100S will work fine for my application?

The most important thing i\'d like to know is if I can control my motors in C language under Ubuntu.

Moreover, i\'d like to ask you if it is possible to connect these controller via USB by using a RS232 to USB converter.

Thanks a lot.