Re: SPARCStation10 and digital I/O


"Gerald" <not.valid@xxxxxxxxxx> wrote in message
news:kLGdnZ40RIPvXrjbnZ2dnUVZ_sjinZ2d@xxxxxxxxxxxxxxxx
On Tue, 17 Apr 2007 14:59:40 +0000, Eric Johnston wrote:

http://www.byvac.co.uk/shop/contents/en-uk/BV4113%20Data***-a.pdf. It
would solve the my need to have two wires, one of which will go to select
a
DC supply voltage ( 14 or 19 volts ) and the other which will turn on or
off
a 22kHz oscillator. The BV4113 module would also solve the next stage,
which is to drive a motor forward and back (10 volts / 200mA) and sense
the
output angle.

Why use an SS10 to control a satellite positioning motor and LNB when most
receivers have that functionality built in using DiSEqc. What's the
purpose for separate control?

Gerald

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That is a good idea as it would neatly solve the hardware aspects: LNB
supply volts/22kHz tone and the motor drive and perhaps the positional
feedback. I considered using a satellite TV receiver, but I would have no
idea how to control it from the Sparc.

My progress so far is a good running c program in the Sparc that has the
following parameters ready (in logical form): LNB supply volts hi/lo, 22kHz
tone on/off, motor angle. I have spent a couple of months already getting
this program working, which successfully communicates each way to a web
page, connects to a spectrum analyser via the NI SB-GPIB board and draws
images.

Having solved the problem of sending/receiving information via the NI
SB-GPIB board, I could cope with some expensive AGILNET i/o chassis with
relays, a/d converter etc. The inexpensive serial wire motor controller
seems a much cheaper idea, but only if I can work out how to send/receive
characters down one of the Sparc serial ports.

Best regards, Eric.


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