Serial Communication with video codec (GB)

I am trying to communicate from Arduino Uno (TTL serial) to a Tandberg video codec (C20) via RS-232 serial (12v). Using a Parallax USB232 interface I can TX/RX RS-232 serial commands from my Mac to video codec. I can also TX/RX serial commands from Mac to Arduino. Now it's time to get the Arduino Uno talking serial straight to the video codec.

It appears that the Parallax USB232 interface is getting power from the Mac's USB port. Can I simply power the USB232 interface via its USB Pin 1 with 5v from the Uno? The Arduino Uno will be powered through the barrel jack. Thanks.

Not shure because USB can deliver until 500ma. Not shure that uno will be able to do it.

Another way is unsing an 7805 regulator with 2 capacitors or an DC/DC converter to to an external power source.

AMHO.

Assuming your talking about this device http://www.parallax.com/Store/Accessories/CablesConverters/tabid/166/ProductID/378/List/0/Default.aspx?SortField=ProductName,ProductName then it's not really suitable. Your better off looking for a TTL to RS232 device like this http://www.ebay.co.uk/itm/RS232-Shield-Arduino-TTL-UART-Port-RS232-/261105132922?_trksid=p3284.m263&_trkparms=algo%3DSIC%26its%3DI%26itu%3DUCI%252BIA%252BUA%252BIEW%252BFICS%252BUFI%26otn%3D21%26pmod%3D261119405859%26ps%3D54 or http://www.ecrater.co.uk/p/12274564/mini-max3232-rs232-shield-board#

Riva, Thanks for the advice on the RS323 shield. I'll give that a try. That sounds like a better approach for an Arduino rookie. :)