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Re: Fw: Rotator/Elevator controled using LAN?



I have written a bunch of software that controls
my rotators (and my radio tuning) over a network connection.
it includes a couple of servers that listen on TCP/IP ports for
commands, and translate and relay the commands to the computer's
serial ports , which are connected to the actual hardware.  The software
runs on a Unix workstation, but could be easily ported to Windows.
I could easily control my antennas over the Internet, if I felt like it.

But it would be really nice to have a simple, cheap microcontroller board
(16F84-style) that had an Ethernet interface.  A company called
Rabbit Semiconductor sells such a thing (along with the development
environment and TCP.IP software library), but it's not especially
cheap.  Check out:

http://www.rabbitsemiconductor.com/products/rab20_tcpip/rab20_tcpip_devkit.html

Interestingly, those Ethernet controller chips that you see on
cheap PC networking cards only cost about $5 or so.  Thus, you
could put together a board with, for example, a 16F874, the Ethernet chip,
and the required glue bits for maybe $40.

The downside is that the TCP/IP software stack and the driver code for the
controller chip are not at all trivial.  But I bet they would be simpler
than a USB interface.  Plus, most of it may already exist...

Doug
NA1DB


At 05:25 PM 1/17/01 , you wrote:

>----- Original Message -----
>From: Murray Peterson VK2KGM
>To: AMSAT-BB
>Sent: Wednesday, January 17, 2001 3:44 PM
>Subject: Rotator/Elevator controled using LAN?
>
>
>     Has anyone tried or succeeded contoling a rotator/elevator unit by
>connect it to a Local Area Network and asigning it an IP address? I have
>some 10 Base 2 (coaxial) ethernet cards and I am thinking whether they might
>be a great way of controling a rotator/elevator unit via a single length of
>RG58. It might be a great way of being able control the rotator/elevator
>unit from several different PCs or at least have several PCs able to read
>the position information.
>
>     A standard LAN connection might be a good standard feature for
>rotator/elevator manufactures to include in their units.
>
>What do you think?
>
>regards,
>Murray Peterson
>VK2KGM
>Sydney, NSW,
>Australia


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