Design a hardware with mbed and WIZ610WI wireless module

I don’t know whether it is right to ask this question here,but if anyone knows,please help me.

I’m designing a hardware containing the mbed and the WIZ610WI wireless module, and I want to connect those using a RS232 interface.

But the wireless module requires a 5-wire connection, with the RTS and CTS lines, and I could not figure out how use these connections with mbed UART.

Can anybody show me a way to configure a serial port in mbed that includes RTS/CTS? Would it be fatal for the purposes metioned above to ignore these lines in my design?

Thanks in advance!