Upon power up the CS100 software is preset to known values.These values are listed with each command, in document 2.44.
This document gives a clear guide to the limits that apply and the function of each mnemonic. These mnemonics are listed below and their page no. for reference (see Taurus Quick Reference Guide).
.............................Page No.
CAL, CSC .............6
CSG, CSI, CSL .....7
CSR, CST .............8
CSV, CSX ............9
CSY, CSZ ............10
GAP .....................15
NOS ....................16
RMP ....................18
RUN ....................19
STP, STR ............20
Parameter 0,1,2
This is dealt with separately because it must be understood how each override effects the operation of mechanisms and the shutter.
These interlocks apply when the shutter Control Module (SCM) is switched and connected to an IPCS detector. The interlock provided by the 4MS and in fact the A & G box have to cleared before the IPCS can open the shutter.
When the system powers up the override level is set to zero which provides the safest level of interlocking. Level 0,1 & 2 can be set with a DIL101(n) command in the usual way.
The difference between levels 0 & 1 is that in level 1 mechanisms are allowed to move with the shutter open but doors must be closed.
Level 2 is at present still available to the user and must be used with extreme care. This overrides all interlocks including
those set up in hardware, so doors and or mechanisms can be operated with the shutter open.
Used mainly for off telescope optical alignment work.
INS, MON ...................Page 22 2.44 Document
RES...............................Page 23
Monitor mode is the most commonly used standard function as this must be implemented by any node wishing to receive updated status from the Taurus system.
Two functions HMS & NET have not been included.
Problems Noted
Four problems have been noted during the commissioning of this network software. They are offered here for comment. One is
certainly known about from previous history.
a) Unreliable location in positioning of pupil wheel. Seems particularly subject to low temperatures.
b) If either the Focal plane wheel or Aperture wheel has to go to location 7 via the encoder index point they will generally miss position. All other locations + index are satisfactory.
Finding location 7 without an index move first works well.
c) Noted sometimes that a detent will drive in and out continuously. This rarely happens if the system has been powered up correctly, but can happen if one of the racks main supply is interrupted leaving the drive cards in an unstable state. Solution is to power system down and power all on together.
d) Because of filter wheel creep when the detent is removed and the telescope is set away from the zenith a modification has been added to this version (V1.11) to apply motor power as the detent is withdrawn and hold the wheel at stall. Then the wheel is driven to its new position and the detent replaced, motor power off. It does no harm to leave the motor at stall although it should be avoided for long periods because of the possible heat generated. Another disadvantage is that the wheel cannot be turned by hand as all efforts will be resisted by the motor which returns the wheel to its original position.
It is expected that this problem will be overcome in Vl.2.