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[on:]

The serial ports don't show up , and when they do, they are not usable.

I am trying to run my RepRap through an Arduino Mega 2560. The Connection worked once. It was a fluke, just changed the USB slot on the side. The only connections that show up are:

/dev/tty/SerialPort (& cu instead of tty)
and
/dev/tty/Bluetooth-PDA-Sync

These don't work. The network settings are set with UBS modem (not configured)

Anybody know what to do to get the Serial port working on the Mac?

[Reply #1 on:]

I just had the same problem! Download 2.2.18 for Mac OSx from:

http://www.ftdichip.com/Drivers/VCP.htm

Install the FTDI driver. I then did a re-boot but that may not be necessary. Open the Arduino IDE, connect the Arduino, and in the Tools menu should now be a USB serial option (don't remember exactly what it's called). The USB serial option didn't appear unless the Arduino was connected.

[Reply #2 on:]

I am trying to run my RepRap through an Arduino Mega 2560.

Is this an official board or something specific to the RepRap?  If it is specific, what is the USB to serial chip being used?

just changed the USB slot on the side.

On the side of what?

These don't work. The network settings are set with UBS modem (not configured)

What is a UBS modem?

Anybody know what to do to get the Serial port working on the Mac?

Plug the board in.