Ive got a Lutron Homeworks 4 Processor that the IP RJ45 has broken on.

I want to programme the processor via the Rs232 D9 port on the processor, but ive not done this before, could someone let me know the adaptor i would need to connect my Laptops USB port the to Rs232 D9 port.

Would it just be a standard USB to D9 connector like the link below or would i require something else ?

[Link: amazon.co.uk]