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User guide
and unlocked manually, whilst a CMG-3T has remote lock and unlock
commands.
CMG-40T, CMG-6T seismometers and CMG-5T strong-motion
instruments do not need locking or unlocking. If you have set the
Sensor Type to one of these sensors, the Mass Control tab will not be
available.
8.5 Data flow
The digitiser operates in one of several transmission modes. These
modes relate to how the unit uses its Flash memory:
• as a simple data store, from which you can request data (FILING
and DUAL modes);
• as a buffer holding unacknowledged blocks, which are
transmitted in preference to real-time data (FIFO mode);
• as a buffer holding unacknowledged blocks, which are
transmitted whenever the transmission is free and no real-time
data blocks are ready (ADAPTIVE mode);
• not at all (DIRECT mode).
Separate from these modes are buffering modes, which tell the unit
what to do when its Flash memory becomes full: It can either
• carry on, overwriting the oldest data held, or
• stop writing and switch the digitiser into DIRECT mode.
You can switch between transmission modes in Scream! by
right-clicking on the digitiser and clicking on Control…, then
navigating to the Data Flow pane:
January 2014 93
- Scream! 4.5 1
- Table of Contents 2
- 1 Introduction 6
- 1.1.1 Diagnostic features 7
- 1.1.2 Digitiser configuration 7
- 1.1.3 Networking 7
- 1.1.4 Recording and replay 7
- 1.2 Scream! as a data viewer 8
- 2.1 Installation on Windows 9
- 3 The main window 11
- 3.2 The stream buffer 14
- 3.3 The source tree 14
- 3.3.1 Icons 15
- 3.4 The stream list 16
- 3.4.1 Sorting options 18
- 3.5 The status bar 19
- 3.6 Viewing streams 19
- 3.7 Connecting to instruments 21
- 3.8 Calibration data 21
- Serial-Nos=serial-number 22
- VPC=sensitivity 22
- CALVPC=sensitivity 22
- CALRES=resistance 23
- TYPE=model-number 23
- RESPONSE=response-type unit 23
- GRAVITY=acceleration 24
- 3.8.1 Examples 25
- 3.9 Other features 26
- 4 Waveview windows 27
- 4.1 Window functions 28
- 4.1.2 Making measurements 29
- 4.1.3 Printing 30
- 4.1.4 Filtering 30
- 4.1.5 Paused mode 31
- 4.1.6 Other icons 34
- 4.1.7 Context menu 35
- 4.2 Stream functions 36
- 4.2.1 Identifying streams 37
- 4.2.3 Scaling streams 38
- 4.2.5 Spectrogram 39
- 4.3 The Filter Design window 40
- 4.3.1 Filter parameters 41
- 4.3.2 Viewing spectra 44
- 4.3.3 Display options 46
- 4.3.4 Pre-sets 47
- 4.4 Display options 48
- 4.4.2 Stream mapping 49
- 5 Networking 53
- 5.1.1 TCP clients 55
- 5.1.2 Multicast clients 55
- 5.2 My Server 56
- 5.3 Server Buffer 59
- 5.4 Gap recovery 59
- 6 Supplementary windows 63
- 6.1.2 Macro commands 65
- 6.1.3 Direct connections 65
- 6.2 Digitiser status streams 66
- 6.2.1 GPS 67
- 6.3 The summary window 70
- 6.3.1 Timing 71
- 6.3.2 Mass position 71
- 6.3.3 Age 72
- 6.3.4 Errors 72
- 6.3.5 Triggers 72
- 6.4 The ViewInfo window 74
- 7 Configuring digitisers 76
- 7.1 System ID 77
- 7.2 Output control 78
- 7.3 Triggering 80
- 7.3.1 STA/LTA 81
- 7.3.2 Level 85
- 7.3.3 External triggering 85
- 7.4 Mux Channels 86
- 7.5 Ports 87
- 8 Controlling digitisers 89
- 8.2 Triggering 90
- 8.3 Calibration 91
- 8.4 Mass Control 92
- 8.5 Data flow 93
- 8.5.1 DIRECT 94
- 8.5.2 FILING 95
- 8.5.3 DUPLICATE 96
- 8.5.4 DUAL 97
- 8.5.6 ADAPTIVE 98
- 8.6 Buffer Memory Usage 99
- 8.6.2 WRITE-ONCE 100
- 9 Recording and playback 101
- 9.2 Files 103
- 9.2.1 UFF file format 106
- 9.2.2 MiniSEED file format 107
- [ExportInfo] 108
- SYSTID=net:NN loc:LL 108
- 9.2.3 SAC file format 109
- 9.2.4 SUDS file format 110
- 9.2.5 GSE file format 111
- 9.2.6 CSS file format 111
- 9.3 Playback 112
- 9.3.2 Reading hard disks 115
- 9.3.3 SCSI tapes 116
- 9.4 Automatic playback 117
- 10 Printing options 119
- 10.1.2 Automatic screen-shots 121
- 10.2 Continuous printout 122
- 10.2.1 Port capturing 125
- 11 Logging and notification 126
- 11.2 E-mail notification 128
- 12 Extending Scream! 130
- 12.2 Running extensions 131
- 13 Keyboard short-cuts 133
- 13.2 Waveview windows 134
- 13.3 Details window 135
- 136 Issue K 136
- 14 Inside Scream! 137
- 14.2 The calvals.txt file 138
- 14.3.2 Linux version 139
- 14.4 Error messages 140
- • The disk is full 141
- 15 Revision history 142
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