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CMG-3ESPCD Digital Broadband Seismometer Command line interface
The AZIMUTH command only alters the digitiser's CMOS settings. You will
need to re-boot the digitiser to transfer them to the DSP.
6.2.6 CROSS
Syntax: channel CROSS
Alters the DSP's transformation matrix to invert one of the digitiser channels.
The argument channel is one of 0 (vertical), 1 (N/S), 2 (E/W) and 3
(auxiliary).
The CROSS command only alters the digitiser's CMOS settings. You will
need to re-boot the digitiser to transfer them to the DSP. If you need to set
both AZIMUTH and CROSS, you must issue AZIMUTH first, since it overwrites
the matrix.
6.3 Output configuration
The commands in this section control the serial data output.
6.3.1 SAMPLES/SEC
Syntax: tap-0 tap-1 tap-2 tap-3 samples/sec
The DSP software on the digitiser supports up to 7 cascaded filter/decimation
stages. At each stage, the sample rate can be decimated by a factor of 2, 4 or 5.
The fixed decimation stages output data at 2,000 samples/sec, so decimated
data streams are available from 1,000, 500 and 400 samples/sec down to 1
sample/sec.
You can specify the sample rate to use at four of these stages, known as taps.
You can also take output from any of these four stages. The digitiser will
arrange the remaining stages according to your settings.
The arguments tap-0 to tap-3 are the sample rates at each tap in turn,
starting with the highest. You must ensure that each rate is lower than the
previous one by a factor of 2, 4, 5, 8 (= 2 then 4), 10 (= 2 then 5) or 16 (= 4
then 4). Non-integer values are not allowed. The following four examples are
all valid settings:
1000 125 25 5 samples/sec
1000 500 100 10 samples/sec
500 100 20 4 samples/sec
400 40 10 5 samples/sec
As long as you specify the initial taps, you can omit later ones. The command
fills in the value of the missing taps, using a decimation factor of 2 where
possible. Thus, the following commands are equivalent:
MAN-C3E-0002 63 Issue B - November 2013
- CMG-3ESPCD 1
- Table of Contents 2
- 1 Preliminary Notes 5
- 2 Introduction 6
- 2.1 Sensor response 7
- 3 Installing the 3ESPCD 8
- 3.1.4 Connections 9
- 3.1.5 FireWire 9
- 3.2 Installation notes 10
- 3.3 Installing in vaults 11
- 3.4 Installing in pits 14
- 3.6 Rapid installation 17
- 3.6.1 Deployment 18
- 3.6.2 Recovery 21
- 3.7 Installing in post-holes 22
- 3.8 Using the 3ESPCD 23
- 3.8.2 Reading digitiser disks 24
- 4 Calibrating the 3ESPCD 28
- 4.2 Calibration methods 32
- 4.3 Calibration with Scream! 33
- 4.4 The coil constant 37
- 5 Using Scream! 39
- 5.1.1 System ID 40
- 5.1.2 Output control 41
- 5.1.3 Triggering 44
- 5.1.3.1 STA/LTA 45
- 5.1.3.2 Level 50
- 5.1.3.3 External triggering 50
- 5.1.4 Mux Channels 51
- 5.1.5 Ports 51
- 5.2 Controlling digitisers 53
- 5.2.2 Triggering 54
- 5.2.3 Calibration 54
- 5.2.4 Mass Control 54
- 5.2.5 Data flow 55
- 5.2.5.1 DIRECT 56
- 5.2.5.2 FILING 56
- 5.2.5.3 Heartbeat messages 56
- 5.2.5.5 ADAPTIVE 58
- 5.2.5.6 DUAL 58
- 5.2.5.7 RE-USE / RECYCLE 59
- 5.2.5.8 WRITE-ONCE 59
- 6 Command line interface 60
- 6.2 General configuration 61
- 6.2.4 BAUD 62
- 6.2.5 AZIMUTH 62
- 6.3 Output configuration 63
- 6.3.2 CONTINUOUS 64
- 6.3.3 SET-TAPS 64
- 6.4 Triggering 65
- 6.4.4 LTA 66
- 6.4.5 RATIOS 66
- 6.4.6 PRE-TRIG 66
- 6.4.7 POST-TRIG 66
- 6.5 Calibration 67
- 6.5.2 SQUAREWAVE 68
- 6.5.3 RANDOMCAL 68
- 6.5.4 MINUTE 69
- 6.6 Actions 70
- 6.6.4 RE-BOOT 71
- 6.7.1 SHOW-FLASH 71
- 6.7.2 DIRECT 72
- 6.7.3 FILING 72
- 6.7.4 ADAPTIVE 72
- 6.7.5 FIFO 72
- 6.7.6 DOWNLOAD 73
- 6.7.7 ALL-FLASH 73
- 6.7.8 ALL-DATA 73
- 6.7.9 STREAM 73
- 6.7.10 STATUS-ONLY 74
- 6.7.11 S/S 74
- 6.7.12 ALL-TIMES 74
- 6.7.13 FROM-TIME 74
- 6.7.14 TO-TIME 74
- 6.7.15 GO 75
- 6.7.16 END-DOWNLOAD 75
- 6.7.17 DISKMENU 75
- 6.7.18 MBTRANSFER 76
- 6.7.19 ERASEFILE 76
- 7 Inside the 3ESPCD 77
- 7.1.2.1 LOCK 78
- 7.1.2.2 UNLOCK 79
- 7.1.2.3 CENTRE 80
- 7.1.3 The feedback system 81
- 7.1.3.1 Hybrid feedback 82
- 7.1.3.3 Comparisons 84
- 7.2 Inside the DM24 85
- 7.2.2.2 from the command line 87
- 7.2.3.2 Loading new DSP code 89
- 8.1 GPS port 90
- 8.2 DATA OUT port 92
- 8.3 FIREWIRE port 93
- 11 Revision History 98
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