[hpsdr] Clarification question- Hermes & Alex

[Dick Faust]

Dave

Hermes controls Alex from J15 directly.  If you have a TAPR build Hermes 
you must do one of two things.
1. Add J15 to Hermes from the top side [already installed on Apache 
version].

2. If you want to use J32 installed on the bottom of the board from the 
Apollo connector [which is a mirror image of J15] you can construct a 
jumper / conversion adapter.  All that is needed is a short 10 pin to10 
pin ribbon cable and a dual 10 pin header with long leads on both sides 
[the pins on both sides need to be about 1/2" long to make contact on 
both sides of the ribbon connectors.  Plug the short jumper cable into 
Hermes, plug the long header into the jumper and plug the Alex 10 pin 
cable into the other side.  Pay attention to where pin 1 starts and 
where it belongs on the Alex cable [red stripe].

Dick K9IVB

dave powis wrote:
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> Hi Phil,
>
> I wonder if I can trouble you with what is probably a simple question 
> regarding Hermes and Alex interfacing?
>
> According to the Alex documentation, it is controlled by SPI bus 
> commands.  Hermes documentation does not mention SPI, but does refer 
> to I2C. Can Hermes control Alex directly, in software terms, please?
>
> It also mentions an interface to Alex using J15, the 10way location 
> for a set of header pins, ready to connect to the Alex control cable.
>
> However, what is confusing me slightly, and I have not been able to 
> resolve from either Hermes or Alex documentation, is the implication 
> at the bottom of Page 2 of the Hermes User guide (V1.8), that 'the 
> HPSDR Alex* board which may be controlled directly from Hermes, with 
> the addition of a few parts.'
>
> Besides the 10 way header pins, what else must be added to Hermes?
>
> Thanks
>
> 73,
> Dave  G4HUP
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