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MRO FTT/NAS & FLC ICD

FTT/NAS Electronics to FTTA Controller ICD

MRO-ICD-CAM-1100-0108

The Cambridge FTT Team

Rev 1.0 9 May 2013

Cavendish Laboratory JJ Thomson Avenue Cambridge CB3 0HE UK


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ICD Description
ICD Number Sub-systems FTTA Org MRAO Owner MF Brief description and preliminary contents Defines the electronic interface between the AMOS/PI FTTA controller and the FTT/NAS electronics · Analog connections · Connector type · Size and location of FTT/NAS electronics.

MRO-ICDFTT/NAS CAM-1100-0108

Change Record
Revision 0.1 0.2 0.3 0.4 1.0 Date 2010-07-09 2012-04-25 2012-04-26 2012-04-28 2013-05-09 Author(s) MF MF MF MF MF First draft version Updated for PDR Applied document number & minor corrections plus conversion to LibreOffice Minor corrections Released Changes

Notification List
The following people should be notified by email that a new version of this document has been issued: MROI: Rob Selina MRAO: Chris Haniff John Young David Buscher Martin Fisher


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Table of Contents
1 Introduction.................................................................................................................................................. 2 Requirements................................................................................................................................................ 2.1 Signal definitions.................................................................................................................................. 2.2 Connector specifications and connections............................................................................................ 2.2.1 Analogue input sockets................................................................................................................. 2.2.2 Analogue output sockets .............................................................................................................. 3 Design........................................................................................................................................................... 3.1 Interface description............................................................................................................................. 3.2 Interface location.................................................................................................................................. 4 Appendix...................................................................................................................................................... 4 4 4 4 4 5 5 5 5 6

Scope
This document defines the connections between the signal connectors of the FTTA controller which is located in EIE electronics housing Q5 and the FTT-NAS electronics interface also located in Q5.

Acronyms and Abbreviations
EIE FTT FLC GPS ICD ID ISS Enclosure vendor Fast Tip-Tilt First Light Camera Global Positioning System Interface Control Document Inner Diameter Interferometer Supervisory System NAS NMT PC PSU TBC TBD UT UTE WFS Narrow-field Acquisition System New Mexico Tech Personal Computer Power Supply Unit To be confirmed To be determined Unit Telescope Unit Telescope Enclosure WaveFront Sensor EMCCD Electron-Multiplying Charge-Coupled Device FTTA Fast Tip-Tilt Actuator

UTCS Unit Telescope Control System

MROI Magdalena Ridge Observatory Interferometer MRAO Mullard Radio Astronomy Observatory

Documents
Drawings
AD1 Unit Telescope Electrical ICD MRO-ICD-AMO-6000-025 AD2 Control Cabinet Q5 MRO-DWG-EIE-00-410-02-05c

Reference Documents
RD1 MRO FTT-NAS Technical Requirements INT-403-ENG-0003 rev 2.2 RD2 MROI Unit Telescope ICD MRO-ICD-AMO-0000-022, issue 7


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1 Introduction
This ICD describes the electrical connections between the Fast Tip-tilt Physik Instrumente (PI), as part of the AMOS telescope contract, and the NAS computer. Both pieces of equipment are mounted in EIE electronics only necessary to connect the electronics interface to the connectors provide Actuator controller electronics interface housing designated d in the PI controller supplied by to the FTTQ5 and it is unit.

2 Requirements
The requirements of the electronics interface are defined by the PI controller specification, the relevant part of which is reproduced here.

2.1 Signal definitions
These are provided by AD1 but reproduced here:

2.2 Connector specifications and connections
2.2.1 Analogue input sockets


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2.2.2 Analogue output sockets

3 Design
3.1 Interface description
The connection between the electronics interface and the PI controller will be made using identical connectors at both ends of a suitable screened cable. The screens of each cable are to be connected to the shell of the connector at the source equipment and not connected at the receiving equipment. The analogue output interface in the FTT-NAS electronics interface is to comply with the design objectives of the PI controller in minimising the impact of noise on the signal inputs, specifically: 1. To use the full dynamic range of ±10V 2. To ensure the output impedance of the signal source is < 250 Ohms. The analogue input interface in the FTT-NAS electronics interface is to accept the full range of output available, specifically: 1. To accept an analogue input range of ±10V The selected analogue interface board meets the signal requirements and so no signal level shifting/scaling and buffering are required to meet cable transmission and source/load impedance restrictions. A circuit board, mounted in the 2U module allows the analogue interface board cable to be separated into the required input/output signal pairs which are wired to the Lemo connectors specified in 2.2. These connectors are mounted on the back panel of the 2U module and the cables which link these to the FTTA electronics mounted below are also supplied.

3.2 Interface location
The interfaces are both located in EIE electronics housing designated Q5 (AD2). The diagram in Table 1 below shows the allocation of space in the 24 available positions, or slots, in Q5. The numbering at the left is in `U' (unit height) modules. The location reserved for the FTTA controller is slots 1-3 and for the FTT/NAS electronics, slots 11-15. The cables supplied with the FTT/NAS electronics shall be long enough to allow the electronics module to be located in slots 14 and 15.


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Table 1: Allocation of space within EIE enclosure cabinet Q5

4 Appendix
The diagram in Figure 1 below indicates the location of cabinet Q5 within the telescope enclosure. The supports for the Nasmyth table are at the top of the picture, nearer to Q1.


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Figure 1: Disposition of cabinets in the telescope enclosure