Güralp Minimus2 User manual

1
Güralp Minimus2
including Güralp Discovery software and the
GüVü app
Technical Manual
Document Number: MAN-MIN-0002
Issue A – Dec 2022

2
Table of Contents
1Preliminary Notes 6
1.1 Proprietary Notice 6
1.2 Cautions and Notes 6
1.3 Manuals and Software 6
1.4 Conventions 6
2System Overview 7
2.1 Key features 7
2.2 Typical applications 7
3System description 8
3.1 Güralp Minimus2 digitiser 8
3.1.1 LED indicator 8
3.1.2 Bluetooth connectivity 8
3.1.3 Data storage 9
3.1.4 Web interface 10
3.2 Accessory package 11
3.2.1 Ethernet cable 11
3.2.2 Compact GNSS receiver and cable 11
3.2.3 Power cable 11
3.2.4 Diagnostic GNSS to Serial cable adapter 12
3.3 Güralp Discovery software 13
3.4 Güralp GüVü Android and iOS app 14
4Getting started 15
4.1 System set-up 15
4.2 Güralp Discovery software installation 15
4.3 Viewing waveforms and system state-of-health 17
4.3.1 Using Discovery’s “Live View” window 17
4.3.2 Using Scream! 20
5System configuration 22
5.1 Web Page login 22
5.2 System status 22
5.3 Data streams 23
5.4 Station meta-data 24
5.5 Network configuration 24
5.5.1 IP address and gateway 24
5.5.2 NTP (Network Timing Protocol) configuration 25

3
5.6 GDI push (auto-connection) 25
5.7 Data storage 26
5.8 Storage 27
5.8.1 Recording status 27
5.8.2 MicroSD card data flushing and unmounting 29
5.8.3 Downloading recorded data 29
5.8.4 Downloading data for specific time-intervals 30
5.8.5 Bulk data extraction 30
5.8.6 The contents of the microSD card 31
5.8.7 Time based download via Network 33
5.8.8 Request data from microSD card via Network 33
5.9 Data transmission 33
5.9.1 Scream! (GCF format + Scream protocol) 34
5.9.2 GDI-link protocol 35
5.9.3 SeedLink Protocol 35
5.10 Synchronisation of the sample-clock 38
5.10.1 GNSS lock status 39
5.10.2 PTP (Precision Time Protocol) 39
5.11 Deploy mode: Full power-save 39
5.12 Configuration and control of connected analogue instruments 41
5.12.1 Setting instrument type 41
5.12.2 Setting instrument (sensor) gain for Güralp Fortis 41
5.12.3 Setting digitiser gain 41
5.12.4 Mass control 42
5.12.5 Instrument response parameters 42
5.13 Configuration and control of connected digital instruments 46
5.13.1 Inject a calibration signal 46
5.14 Earthquake Early Warning 47
5.14.1 Trigger Configuration 47
5.14.2 EEW Configuration 48
5.14.3 CAP receiver 48
5.14.4 Seismic Event Table 50
5.15 Using a Registry 51
5.15.1 Configuring a Minimus2 for use with a registry 51
5.15.2 Configuring Discovery for use with a registry 52
5.15.3 Registry mode: using WAN or LAN addresses 53
5.16 Updating Minimus2 firmware 54
5.17 Import / Export an existing configuration 54
5.18 Control Centre 55
6GüVü app 57
6.1 Getting started 57
6.2 Selecting data sources 57
6.3 View settings 58
6.4 Instrument control 58
6.4.1 Setting the PIN code 59
6.5 Emailing a deployment report 59

4
7Advanced troubleshooting 60
7.1 Reset all settings during boot phase 61
8Appendix 1 – Instrument/channel names 62
9Appendix 2 - Digital interconnectivity and devices 63
10 Appendix 3 – network ports 64
11 Appendix 4 – Connector pin-outs 65
11.1 Ethernet 65
11.2 Power 65
11.3 GNSS/serial 67
11.4 Digital 67
11.5 Analogue 1 and Analogue 2 68
12 Appendix 5 – Dimensions and drawings 70
12.1 Minimus2Error! Bookmark not defined.
13 Appendix 6 – Güralp Discovery installation 71
13.1 Installation in Linux 71
13.2 Installation in Mac 72
13.3 Installation in Windows 73
13.4 Configuring Windows Firewall 75
13.5 Update 77
14 Appendix 6 – IP address configuration on PC or Laptop 80
14.1 On Linux 80
14.2 On macOS 80
14.3 On Windows 82

5
15 EU Declaration of Conformity 83
16 Revision History 84

6
1 Preliminary Notes
1.1 Proprietary Notice
The information in this document is proprietary to Güralp Systems Limited and may
be copied or distributed for educational and academic purposes but may not be used
commercially without permission.
Whilst every effort is made to ensure the accuracy, completeness and usefulness of
the information in the document, neither Güralp Systems Limited nor any employee
assumes responsibility or is liable for any incidental or consequential damages
resulting from the use of this document.
1.2 Cautions and Notes
Cautions and notes are displayed and defined as follows:
1.3 Manuals and Software
All manuals and software referred to in this document are available from the Güralp
Systems website: www.guralp.com unless otherwise stated.
1.4 Conventions
Throughout this manual, examples are given of command-line interactions. In these
examples, a fixed-width typeface will be used:
Example of the fixed-width typeface used.
Commands that you are required to type will be shown in bold:
Example of the fixed-width, bold typeface.
Where data that you type may vary depending on your individual configuration, such
as parameters to commands, these data are additionally shown in italics:
Example of the fixed-width, bold, italic typeface.
Putting these together into a single example:
System prompt: user input with variable parameters
Caution: A yellow triangle indicates a chance of damage to or failure of the
equipment if the caution is not heeded.
Note: A blue circle indicates a procedural or advisory note.

7
2 System Overview
Thank-you for purchasing a Güralp Minimus2 digitiser.
This section describes the key components of a Minimus2 system. The Minimus2 unit
is the main, standard product in the system; other components and accessories are
optional and can be purchased separately. Please check your order confirmation to
see which components were purchased with your system.
The Minimus2 has four fully-featured analogue input channels.
2.1 Key features
•24-bit, four-channel digitiser with nominal 2.44 µV/count sensitivity.
•Compact form, measuring just 134 ×99 ×45 mm and weighing just 0.6 kg.
•Compatible with all analogue seismic sensors with a voltage output.
•Simultaneously accommodates one triaxial sensor(s), one infra-sound
sensor(s).
•Supports automatic Identification of IP addresses via Güralp Discovery
software and a cloud-based or organisational registry server.
•Remote instrument and data management via Discovery.
•Bluetooth Android app for installation integrity checking.
•Low-latency mode for Earthquake Early Warning (< 40 ms).
•Hot-swappable data storage with dual redundant microSD cards.
•GNSS time-synchronisation, compatible with Navstar (GPS), GLONASS, Galileo
and BeiDou constellations.
2.2 Typical applications
•Earthquake Early Warning systems.
•Volcanology.
•Multi-scale seismic networks.
•Structural health monitoring.
•Hydrocarbon exploration.
•Permanent reservoir monitoring.
•Induced seismicity detection.
•Explosion monitoring.

8
3 System description
3.1 Güralp Minimus2 digitiser
The Güralp Minimus2 is a combined digitiser and advanced communications unit.
The Minimus2 acquires data from – and allows direct control (where appropriate) of –
connected analogue instruments ( e.g. Güralp Fortis, 3-series, 5-series, 40T and 6T
sensors) and digital instruments ( e.g. the Güralp Certis).
When used with newer version of Güralp 3T instruments and the Certis Instrument,
the digital serial connection available on the 26-way instrument connector is used to
convey additional state of health information as well as calibration and response
information.
3.1.1 LED indicator
The Minimus2 has an LED indicator on the upper surface, which provides status and
configuration information.
•
White: This occurs from power-up until software starts
•
•
Three flashes followed by a pause, then repeat.
•Each flash is either Red or Green
•First Flash – Internal SD card good and recordings (Green)
•Second Flash – External Removable SD card is good and recording (Green)
•Third Flash - GPS Time lock is good (Green)
•
1 blue flash: a trigger event has been detected.
3.1.2 Bluetooth connectivity
The Minimus2 features Bluetooth connectivity, allowing sensor and state-of-health
data to be monitored using the Güralp GüVü app (see section 3.4 Error! Reference
source not found.on page 14) on an Android mobile phone or tablet.
The Bluetooth can be disabled via software to save processor usage but the hardware
module cannot be switched off. BLE (Bluetooth Low Energy) technology is used to

9
minimise the power requirement. The Bluetooth transmitter/receiver is in permanent
standby mode and always ready to receive a connection from a phone or tablet.
See Chapter 6.4 on page 58 for further details on connecting to the Minimus2 and its
attached sensors using a phone or tablet.
3.1.3 Data storage
The Minimus2 uses microSD (non-volatile) memory technology to store seismic data
locally. The Minimus2 features two such microSD cards in order to provide
redundancy; this helps to protect the recorded data in the unlikely event of any
corruption or problem with the memory cards. One card is internal and cannot be
removed by the customer; the other is hot-swappable and easily accessible without
any technical knowledge.
The Minimus2 is supplied with two microSD cards that are of equal storage capacity
( e.g. two 64 GB cards).
Güralp recommends the use of industrial-grade SD cards
3.1.3.1 Primary (hot-swappable) microSD card – new style
The upper surface of the Minimus2 has a waterproof screw-in card-holder that is
sealed by an O-ring.
To insert or replace a microSD card, proceed as follows:
1. Rotate the card-holder in an anti-clockwise direction, unscrewing it from the
body of the digitiser.

10
2. The microSD card is accessible via the slot in the side of the card-holder. Push
the card in gently and then release the pressure: the card will spring outwards
a little. It can now be grasped and withdrawn.
3. To insert a new card, line it up with the slot as shown and push it gently into
place. Once you feel the spring pressure, continue pushing until more
resistance is felt and then release the pressure: the card will lock into place.
4. Finally, replace the cap and rotate clockwise until hand-tight. Do not over-
tighten and do not use tools.
3.1.3.2 Internal (back-up) microSD card
The second microSD card is factory-installed in a slot inside the unit.
3.1.4 Web interface
The Minimus2 contains on-board firmware that presents monitoring and
configuration interfaces. These are accessible through Güralp’s Discovery software
(see section 3.3 Error! Reference source not found.on page 13) or, with the built-in web
server, via Discovery's browser interface or any standards-conformant web browser.
The Discovery interface allows a number of instrument monitoring, control and
configuration options:
•Sensor readings and instrument State-of-Health
•Network configuration and authentication
•Sensor, timing, and station configuration/information
•Remote data-streaming configuration
•Local data-storage configuration
Caution: The card holder connects electrically to the Minimus2 via
a series of slip-rings which ride on metal fingers in the main body
of the digitiser:
It is very important that the slip-rings and the metal finger-
contacts do not become damaged or tarnished. Take care not to
touch either part. If a Minimus2 has had its card-holder removed,
do not leave it exposed to the elements. If a card-holder is to be
transported when it is not installed in a Minimus2, enclose it in a
protective bag or covering so that it cannot be scratched or
contaminated.
Note: In order to ensure data integrity and security, Güralp only
recommends the use of the supplied industrial-grade microSD cards.
Caution: The internal microSD card is not accessible by the user. Attempts
to remove or replace it will void the warranty.