SiLabs USB driver for Mac

Hi,
I am making a GPS device which can send 1 PPS (pules per sec) signal to the modem Data Carrier Detect (DCD) pin and then convert from UART to USB using CP2102 (Silicon Labs).
A windows driver + serial port monitor program can correctly detect a 1 PPS signal being sent to DCD pin. But when I try to read the DCD pin status with the Mac driver (SiLabsUSBDriver) + C code, I could not get any changes from DCD pin.
This is what I've done.
#define BAUDRATE B9600
#define USBDEVICE "/dev/cu.SLAB_USBtoUART"
fd = open(USBDEVICE, O_RDWR|O_NOCTTY|O_NDELAY);
ret = ioctl(fd, TIOCMGET, &status);
printf("DCD , %d \n", status & TIOCM_CAR);
The value of status is always 0.
Can anyone help?
Andrew

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