Can I asume it would be safe to connect PB 10 and PB11 on a cerb 40 to an FTDI-usb (respective TX and RX pins) cable to get serial comms via USB to a PC?
I dont have a Cerb 40 yet but ive got something cooking in my head.
Yup and if you get the 3.3v cable you could power it off that as well.
Cooking with gas? Do tell…
Correct, assuming you get the 3.3V version of the FTDI TTL cable/board and PB10/PB11 are the COM port pins.
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They’re just TTL signals, so yes, connecting to a FTDI USB-TTL cable will work, or any of the cheap alternatives (like CP2102, see http://www.ebay.com.au/itm/USB-2-0-UART-TTL-6PIN-Connector-Module-Serial-Converter-CP2102-New-/280776534912?pt=LH_DefaultDomain_15&hash=item415f95eb80) would work fine.
Go back to bed Gus… Go back to work Justin.
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Perfect, thanks guys. Its for a proof of concept for a commercial product for work so i cant really say anything about it yet till i get approval from the Boss 
Edit: I never ever thought i would be in a position to even consider doing actual non hobby POC. But thanks to GHI and everyone on this forum i feel i can tackle this head on.
@ Brett - work is boring…bit late down under in all 