Previous Next Contents

3. Control Room Equipment

xxx

3.1 Control Room PC, ``antcon.kurp.hut.fi''

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:

  1. 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.)
  2. 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.
  3. An old VAX-wire-wrap or new PWM card is required for FET board testing.
  4. A RS232-mux/switchbox required for testing the controlling system before final installation. Will be connected next to control room RS232 to RS422 converter.
  5. A two-channel D/A output card ET-1728 (FIM 1433) plus its adapter card ETD-7285 (FIM 215); we already have them.
  6. 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:

  1. GAL and ULN-based driver for 5V LEDs or 24V LED-lamps (with 2-bit off/dim/lit/bright selection)
  2. Debouncing push buttons, maybe a standard opto-in board to accomplish 24V to 5V TTL conversion
  3. 7-segment Az/El panel?

3.2 Differential receiver amplifier and sampling filters

xxx


Previous Next Contents