MAC serial port application

I would like to test my serial-to-USB chip CP210x. First, I plug in USB cable with this chip, then system found CP210x in USB HUB but can't find ttyDevice. So just go to SiLab web site to download the newest driver and it's supported OSX 10.7. After installing the driver, the SLAB_USBtoUART will be found on /dev folder. I use two serial port applications: one is called Zterm is the old tool but it seem can't send hex string. So I use another tools called Coolterm http://www.macupdate.com/app/mac/31352/coolterm/ ,and it's so easy. So I am going to develop serial port tool on MAC.