| [simpits-tech] my com stack [message #2160] |
Wed, 16 March 2011 14:11 |
 phoenixcomm
Messages: 164
Registered: January 2009
Location: Fort Worth, Tx |
Senior Member |
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oh well have you fought will your control heads, and the crazy pin-outs?
well I started building my radio stack I found on eBay a Gables G-4390
with a yellow tag! I paid about 30 bucks including shipping. The bad
news is the connectors is going to set me back another 100 bucks or more.
Onwards well this is what i found out the each of the 4 heads, 2 nav,
and 2 com, have 5 pins per digit, this is the 2 of 5 code.
This is the article that I wrote:
http://simpits.wetpaint.com/page/2+of+5+Code
I am also putting this into the Wikipedia
The control head has 5 groups of 5 plus I added a status to monitor the
on-off, and test switches,
so you need a bus with 6 groups of 5 data lines ( since most computers
use 8 bits, just pull the 3 unused lines up. a great part for this is a
74LS125 or 126 (quad bus buffers) they have tri-state outputs.
you can select the output group with a 74LS138 (3 of 8) decoder and if
you need more selects you can chain this part and its great for this
application as it want low active inputs.
then do a little code to read and write your port. tada.
Enjoy
Cris H.
phoenixcomm.net/~phnx2000/sim
phoenixaerospace.us
more later
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