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xxx
The control room PC is a rack-mounted model similar to the
existing VLBI control PC. It will eventually run Linux-based antenna
control programs and take care of antenna status monitor display,
located in control room rack. Apart from the standard PC equipment
the following should be added:
- A RS232 to RS422 converter to ensure down-up 115kbaud link
reliablity. (Most probably COM-1485 by Capax (FIM 463) will do, if it
is fast enough.)
- An interface to accept coordinates from VAX parallel output.
The wire-wrapped prototype by Jouko will be able to do this. The
final VAX interface electronics is also being designed and may be
substituted. A new ribbon cable may be required.
- An old VAX-wire-wrap or new PWM card is required for FET board
testing.
- A RS232-mux/switchbox required for testing the controlling
system before final installation. Will be connected next
to control room RS232 to RS422 converter.
- A two-channel D/A output card ET-1728 (FIM 1433) plus its
adapter card ETD-7285 (FIM 215); we already have them.
- Interface cable from the D/A card to ESSCO servo rack. We
already have the MIL-type connector and any shielded cable will do.
5MHz/1pps/sampling clock generator
xxx maybe this will be located in ``daqqer.kurp.hut.fi
'' sampling
PC, maybe another copy of this board will be added to
``antcon.kurp.hut.fi
'' to provide accurate UTC
clock. (On the other hand, ``antcon
'' does not
really require ``super-accurate'' time since tower PC has
it.)
xxx 50/50 percent ``duty cycle'' control output signal for controlling
receiver (Dicke) switchers?
Quadrature encoder input board
xxx like motor digital tachometer input board, but with 4 TTL inputs
(instead of 4 differential inputs)
Control Panel Digital In/Out
xxx standard ISA board plus a separate (Euro?) board with:
- GAL and ULN-based driver for 5V LEDs or 24V LED-lamps (with
2-bit off/dim/lit/bright selection)
- Debouncing push buttons, maybe a standard opto-in board to
accomplish 24V to 5V TTL conversion
- 7-segment Az/El panel?
xxx
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