Re: Working serial port.

The #RST pin on J5 is an input, not an output.  When active (low) it 
resets the CX82100 on the Actiontec board.  I am driving it with the 
same reset circuit as the UART, though the signal is inverted first.

I've already got a Motorola Encore GPS board.  It's not quite as small, 
but I'm not planning to try and fit it in the Actiontec case. 

Patrick M

Bruce D. Lightner wrote:

> Patrick,
>
>> I have a working serial interface sitting on a breadboard in my lab.  
>
>
> Good work!
>
>> One big note:  You must have some sort of reset circuit for the 
>> UART.  A simple power on will not suffice, the Actiontec will not see 
>> it.
>
>
> Can't we assume that the Actiontec "reset" signal (i.e., RST#) from J5 
> will do the job for the UART?
>
>> http://www.supersecret.org/actiontec/serial_boot.jpg
>> http://www.supersecret.org/actiontec/breadboard.jpg
>>
>> The circuit I'm currently working with is a duplication of what is on 
>> the "official" daughter card.  If I get a chance this evening, I'll 
>> re-wire it to follow Bruce's schematic and verify that.
>
>
> That would be great!
>
>> Bruce:  In answer to your "Why attach a GPS?" question.  I'm going to 
>> turn one of these units into a time server for my network.
>
>
> Well, it seems to me that I should probably give you one of these for 
> your trouble...
>
>   http://trl.trimble.com/dscgi/ds.py/Get/File-22183/
>
> We get them pretty cheap at Networkcar (http://www.networkcar.com/).
>
> It should fit inside the Actiontec enclosure.
>
> Best regards,
>
> Bruce
>

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