Equinox Systems GEMINI Manuel d'utilisateur Page 47
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Gemini Users Manual 42
4.2.3.2 Connecting an Autoguider with TTL Output
The typical "open collector" output stage (e.g. the ST-7/8/9/10, user-modified ST-4) has
high impedance while inactive and pulls down the direction signals to a common ground
when active. This is exactly the opposite of the way the Hand Controller and autoguider
ports of the older version Gemini system work.
A relay (or optocoupler) decouples the switching device (the Autoguider) from the
controlled device (the Gemini), thereby avoiding a direct connection between the two
systems and protecting both systems against high currents that could cause damage.
IMPORTANT NOTICE:
(1) Never connect TTL output stages directly to the Hand Controller or autoguider ports
of an older version Gemini! Severe damage may occur to the connected devices. Use a
Relay Box (as provided by SBIG) or the optional Losmandy Optocoupler unit instead.
By so doing, you get the additional advantage of providing electrical protection to these
sensitive units.
(2) The use of two separate power supplies without a coupler unit is strongly
discouraged. To do so would connect the ground of one system to the supply voltage of
the other system, causing the two grounds to be at different potentials. If the grounds of
the two systems are then connected, severe damage is likely to occur.
Detailed instructions for connecting an SBIG camera with TTL outputs to the older
version of Gemini can be found in Appendix 8.6 (Autoguider Port).
4.2.4 Connecting an Autoguider to a Newer Gemini
The Autoguider port on the newer versions of Gemini is plug compatible with a large
variety of autoguiders. You can use an autoguider with relay outputs such as the SBIG
ST-4 and STV or an autoguider with TTL outputs such as the SBIG ST-7/8/9/10 directly
using the appropriate cable. Use SBIG’s “TIC” cable for the ST-4 and STV, and SBIG’s
“TIC-78” cable for cameras with TTL output.
The SBIG relay box can be used, but is not necessary. The Losmandy Optocoupler is not
compatible with the newer Gemini.
4.2.5 Software Guiding
An alternative to using the autoguider port is to write your own software to send guiding
commands over the serial connection using the LX200 protocol. There are commands to
start and stop guiding movements, the serial transmission may cause a small delay and
jitter that nevertheless should be adequate for most purposes. There are also Precision
Guiding commands available allowing you to move the mount exactly for a precalculated
amount of steps, time or arc seconds.
- Users Manual 1
- Table of Contents 2
- 1 Introduction 6
- 1.2 Features 7
- 1.3 What’s New in Level 4? 10
- 2 Getting Started 13
- 2.2 Installation 14
- 2.2.3 Encoders 15
- 2.2.4 Power Requirements 16
- 2.3.1 Controls 16
- 2.3.3 QuickMenu 18
- 2.4 Basics of Operation 19
- 2.4.1.2 Startup Position 20
- 2.4.2 Power On and Setup 20
- 2.4.2.2 Completing Startup 23
- 2.4.2.3 Preferences 23
- 2.4.4 Normal Operation 27
- 2.5 Next Steps 28
- 3.1.2 Precession 30
- 3.2 How the Sky Moves 31
- 3.3 Tracking 31
- 3.3.1.1 Predefined Rates 32
- Training Comet Tracking 35
- Timer Values 35
- PC Controlled Tracking 36
- 3.3.2 Meridian Flip 37
- 3.3.3 RA Safety Limits 37
- 3.4 Polar Alignment 39
- 3.4.3 Accuracy Required 41
- 3.5 Mount Modeling 42
- 3.5.3 Modeling Parameters 44
- 4.2 Guiding 45
- 4.2.2 Manual Guiding 46
- 4.2.5 Software Guiding 47
- 4.3.2 The PEC Submenu 49
- 4.3.2.1 Train PEC 49
- 4.3.2.2 Clear Data 50
- 4.3.2.3 Turn PEC On/Off 50
- 4.3.2.4 Delay Correction 50
- 4.3.2.5 Drift Correction 51
- 4.3.2.6 Smooth Data 52
- 4.3.2.7 Average Data 52
- 4.4 Other Functions 53
- 5.1 Startup Mode Menu 54
- 5.2 The Main Menu 55
- 5.3 Subordinate Menu System 56
- 5.3.1.2 {Reset Alignment} 57
- 5.3.1.3 {Additional Align} 57
- 5.3.1.4 Synchronize 58
- 5.3.1.5 {Polar Al. Assist} 58
- 5.3.1.6 {Polar Axis Corr.} 58
- 5.3.2 Object Database 59
- 5.3.2.1 Database Use 59
- 5.3.2.2 Accuracy and Epochs 60
- 5.3.2.3 Credits 60
- 5.3.2.6 IC (Index Catalog) 61
- 5.3.6.1 RA/DEC Display 64
- 5.3.6.2 Enter RA/DEC 64
- 5.3.6.3 Az/El Display 64
- 5.3.6.4 Enter Az/El 65
- 5.3.6.5 Set Bookmark 65
- 5.3.6.6 {GoTo Bookmark #n} 65
- 5.3.7 Identify 65
- 5.3.8 Object Search 66
- 5.3.8.2 Wobble Object 67
- 5.3.9 Show Date/Time 67
- 5.3.9.2 Julian Date 67
- 5.3.10 Setup 68
- 5.3.10.1 Hand Controller 69
- 5.3.10.2 Mount Parameters 69
- 5.3.10.2.1 Tracking Speed 70
- 5.3.10.2.2 Moving Speeds 71
- 5.3.10.2.5 Mount Type 72
- 5.3.10.2.8 {Pointing Model} 75
- 5.3.10.3 Encoder 76
- 5.3.10.4 Alarm/Buzzer 76
- 5.3.10.5 UTC Date/Time 77
- 5.3.10.6 Credit Info 77
- 5.3.10.7 Restore Defaults 78
- 5.3.10.8 Dim Display 78
- 5.3.10.9 Geogr. Location 78
- 5.3.10.9.5 Store Site 79
- 5.3.10.9.6 Load Site 79
- 5.3.10.10 Communication 80
- 5.3.10.10.2 Sync or Align 80
- 5.4 QuickMenu 81
- 5.4.1 Focusing 82
- 5.4.4 Centering 82
- 5.4.5 Park Mount! 83
- 5.4.6 Meridian Flip 83
- 5.4.7 Exit w/o Change 83
- 6 Serial Communication 85
- 6.2 Hand Controller port 87
- 6.3 Serial Command Sets 88
- 6.5.1 Telescope Driver 90
- 6.5.3 Coordinate Epoch 90
- 6.6 Using Control Programs 91
- 7 Troubleshooting 92
- 7.2 Debug Mode 96
- 8 Appendices 97
- QuickMenu 101
- Cold Start Setup Menu 101
- *Reduced Menu 101
- 8.2 Catalogs 102
- 8.3 Alignment Star List 103
- 8.4 Serial Line Protocol 105
- • Right Ascension 112
- • Declination {+ 112
- • the object name (up to 10 112
- Gemini Native Commands 116
- 8.5 Serial Communications 129
- 8.6 Autoguider Port 130
- 8.7 Encoder Port 132
- Connecting End Switches 133
- 8.8 Feature Port 134
- 8.9 Motor Connector Pinouts 135
- RJ-45 Connector 135
- DIN Connector 135
- 8.10 Power Connector Pinout 136
- Power Connector 136
- 8.11 Upgrading the EPROM 137
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