ELT for VLT Developer

This section aims to help introduce developers familiar with VLT software to similar or related ELT concepts.

Table 1 Concept mapping between VLT and ELT

VLT

ELT

Comment

BOSS

OCM

The main component coordinating the exposures/Data Acquisitions. In VLT it also had a supervisory and role for which commands were forwarded through BOSS. BOSS was also a common point of customization to add new commands for e.g. slow guiding. This is not the case in ELT where direct setup is the norm and custom behaviour is implemented as separate components.

BOSS Archiver

DPM

Component responsible for creating the final Data Product and deliver it to the Archive (OLAS). In ELT DPM will also be able to deliver the final Data Product to more than one receiver, but the standard and default receiver will remain to be OLAS.

Exposure

Data Acquisition

The term has been generalized for ELT to better suit the wide range of data that can be acquired. See glossary Data Acquisition for a description.

Expoid

Data Acquisition Id

Uniquely identifies an exposure/Data Acquisition. This is a mandatory parameter in most Data Acquisition commands in OCM.

dxfFileSend / dxfFileReceive

DPM

In VLT BOSS Archiver requires that all files are available on locally mounted file system. DXF applications dxfFileSend and dxfFileReceive are used to send files to the workstation where merging takes place.

In ELT DPM take over this responsibilty and will automatically retreive all remote files before executing the merge.

VCSOLAC

DPM

In VLT VCSOLAC is responsible for monitoring used to transfer the merged file from BOSS Archiver to DHS workstation. In ELT DPM is designed to be deployable on DHS workstation (see Deployment) in which case the file is delivered to OLAS locally. In case DPM is not deployed on the DHS workstation the file is transferred by DPM as part of the file delivery.