Equinox Systems GEMINI Manuel d'utilisateur Page 86
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Noté. / 5. Basé sur avis des utilisateurs
Gemini Users Manual 81
The following picture shows a cable to connect the Gemini to a PC equipped with a DB9
serial COM port (The locking tab of the RJ22 and the four-pin row of the DB9 face away
from the viewer):
Serial cable to connect Gemini to a PC
The maximum usable cable length depends on several factors including the serial
interface of the PC connected, the cable used, electromagnetic fields at the location and
even the power supply’s ground resistance.
Longer cables must be of higher quality than shorter cables. A heavier gauge of wire will
result in lower resistance, and consequently a lower voltage drop. Straight (not coiled)
cables are recommended. Twisted pair cables can be used, but be careful not to twist the
RxD and TxD wires. Twist each of these signal wires with a wire connected to GND
instead. For long distances, using multiple wires for GND helps reduce the disadvantages
of the asymmetric (common GND wire) circuitry.
A shielded cable with the shield connected to the metal of the Sub-D connector on the
computer side is also recommended.
With good cabling, communication over distances of about 50 ft. should be possible.
Longer distances may be bridged by using relay modems. These units change the
asymmetric circuitry to symmetric circuitry (no common GND wire) that is relatively
insensitive to electromagnetic fields and ground potential differences, and can therefore
communicate up to several miles.
The serial ports provide an electrical connection between the Gemini and the computer. If
there are differences between the ground potentials of the devices, ground loop currents
may occur, potentially damaging both pieces of equipment. To avoid such currents, you
should ensure that both devices have the same ground potential. Whenever possible, the
- 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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