There's a new Mac app called Serial available on the App Store. Full disclosure- I wrote it. We got tired of having to find and install drivers for different serial adapters and devices we have here in order to administer Cisco switches, so we wrote our own terminal that uses its own built-in drivers for the most common chipsets available. There's a free demo available.
Also, as of Mac OS X 10.9, Apple began shipping their own FTDI driver. So, if you're using a USB-serial adapter that uses the FTDI chipset (many of the higher-end adapters do), you don't need to worry about installing drivers and can use the built-in screen command in the Terminal to access serial ports.
There are a couple other things that can be tried. Connect the usb cable to your laptop, and then drop to terminal and type this:
Find the device that's associated to your usb port. Then use screen to that:
If that doesn't work try this:
ioreg -c IOSerialBSDClient | grep usb
If it comes back with something, find the IOSerialCallOutDevice and screen to that:
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You'll need to get a usb-serial adapter and then connect with a console cable. Adapters aren't very expensive.
Connecting to the Console Port with Mac OS X
To connect a Mac OS X system USB port to the console using the built-in OS X Terminal utility, follow these steps:
Step 1 Use the Finder to go to Applications > Utilities > Terminal.
Step 2 Connect the OS X USB port to the router.
Step 3 Enter the following commands to find the OS X USB port number:
macbook:user$ cd /dev
macbook:user$ ls -ltr /dev/*usb*
crw-rw-rw- 1 root wheel 9, 66 Apr 1 16:46 tty.usbmodem1a21
Step 4 Connect to the USB port with the following command followed by the router USB port speed:
macbook:user$ screen /dev/tty.usbmodem1a21 9600
To Disconnect the OS X USB Console from the Terminal Window
Enter Ctrl+A followed by Ctrl+\
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