Equinox Systems GEMINI Manuel d'utilisateur Page 89
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Gemini Users Manual 84
6.3.2 Gemini Native Commands
Access to the Setup data, modeling parameters, tracking rates and much more is possible
by means of Gemini’s Native Command set. These commands have a format that allows
for easier parsing and execution. The use of a checksum allows for safe transmission.
Command Return Value Description
<<id>:<checksum>#
<parameter
value><checksum>#
Get Value (from L2 up)
><id>:<parameter
value><checksum>#
# Set Value (from L2 up)
Native Serial Command Syntax
Each command has a numeric identification, “id” that is interpreted as an integer; leading
zeros are ignored. To request a value from Gemini, the command begins with the “less
than” character “<”, and to set a value, the command begins with “>”. Some commands
are grouped (e.g. the tracking rates are group 130). If any one of the commands within
this group is used in a “Get Value” command, the actual setting (e.g. 131 for Sidereal
Tracking) is returned.
The checksum for the native commands is calculated by a bytewise XOR operation of the
transmitted characters, including the Get/Set command sign (“<”, “>”). The highest
significant bit of the result is cleared (modulo 128 operation) and 64 is added. For
sending, the checksum is separated by a colon. On receiving, there is no colon, but the
checksum can easily be recognized after the parameter value because it is never a number
(in the ASCII alphabet, number characters range from 48 (30H) to 57 (39H), so the
checksum will always be greater.)
Commands received with a wrong checksum are not executed. If Gemini is in Debug
mode, both the received and the expected internally calculated checksums are displayed
as hexadecimal characters instead.
6.4 Connecting a GPS Receiver
The serial ports of many GPS receiver units have a special, non-standardized design. To
connect these GPS units to a computer, you will have to obtain a cable from your GPS
manufacturer for that purpose. On the PC side, these cables have a DB9 connector like
the one shown in section 6.1. There are two options for connecting this cable to the
Gemini. The first is to buy a commercially available null modem adapter (male DB9
connectors on both sides). A simple “gender changer” will not work, since it would
connect the outputs of both ports (TxD to TxD) and inputs (RxD to RxD) to each other.
The null modem adapter will cross TxD to RxD.
Alternatively, a cable can be made with an RJ22 plug as described in section 6.1, but with
a male DB9 connector and the RxD and TxD wires swapped.
- 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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