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How to set RTS in MCB2300 board with LPC2388(144 pin)

Prabu e

Hi all, I am using keil MCB2300 board with LPC2388(144 pin).I
want to communicate with external modem through UART1.
Currently i am using RX and TX pin.But Modem expecting RTS and
DTR pin to be high.If i set RTS and DTR means,Output volatage of RTS
and DTR pin is ~ -0.15.Here is my configuartion

REG_PINSEL0 |= 0x40000000; /* Enable TxD1 REG_PINSEL1 |= 0x00001101; /* Enable RxD1 ,RTS1 and DTR1*/

REG_U1MCR = 0x3;

Please share ur knowledge???