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Posted: **Wed Aug 26, 2015 7:07 pm**

Hello-

I am using a Mac instead of a PC and I followed the instructions for downloading Arduino and no options for "com" come up for available ports. I have /dev/cu.Bluetooth-Incoming-Port, /dev/cu.Bluetooth-Modem, and /dev/cu.usbmodemfa131 available. Any ideas?

Posted: **Wed Aug 26, 2015 8:27 pm**

Unplug arduino,

Check ports,

Plug arduino,

Check ports.

It is the one that appeared.

Posted: **Wed Aug 26, 2015 8:30 pm**

It will appear similar to those you listed. They are not called com on the mac.

Posted: **Wed Aug 26, 2015 8:58 pm**

Probably that last one.

- unplug the connection.
- Start the Terminal app.
- type

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ls /dev > t1

- plug the connection in and give it a moment to get discovered etc by the computer.
- type

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ls /dev > t2

then

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diff t1 t2

You should get something like

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17a18
> cu.usbmodemfd131
192a194
> tty.usbmodemfd131

These are the two endpoints for the usb serial connection. I tend to go with the "cu" version but I think both work OK.
Don't forget to clean up the files:

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rm t1 t2

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Using a Mac...not PC

Using a Mac...not PC

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