[aprssig] GPS GT-320FW(AS)

Andrew Rich vk4tec at tech-software.net
Sun Apr 21 09:20:39 CDT 2013


And more importantly the phase of the TTL

There's RS232 -7 / +7 volts
There's sudo RS232 0 / 5 volts

Then there is USART compatible which is sudo RS232 upside down 

Sent from my iPhone
Andrew Rich

On 21/04/2013, at 11:06 PM, Jason KG4WSV <kg4wsv at gmail.com> wrote:

> The datasheet indicates it has both TTL level and RS232 level
> depending on which set of pins you use.
> 
> What isn't clear is the TTL voltage level - is it 3.3V TTL? 5V?  3.3V
> but 5V tolerant?
> 
> -Jason
> kg4wsv


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