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CMG-DCM

2 Installing the CMG-DCM

2.1 Overview

The DCM is effectively a low-power Linux computer dedicated to seismic data
flow tasks. Resources permitting, the DCM can perform any computational task
you require. Because of this flexibility, the DCM must be configured for your
particular purposes before it can be used:

1. If you only need to use the DCM as a data store, you can gain console

access over the serial port for configuration.

2. If you are going to use the DCM as part of a TCP/IP network, you must

set up its IP address and other networking parameters before you can
connect to it. Whilst the network is inoperative, you will need to connect
to the DCM console over a direct serial connection. We recommend that
you configure the DCM correctly, to the best of your knowledge, before
shipping it into the field.

3. If you want to connect to the DCM using TCP/IP over modem links, you

must set up PPP over these links. Configuring PPP is beyond the scope
of this manual: please see the Linux

man

page for

ppp

for details, or the

Linux PPP HOWTO.

4. Once communication with the DCM is working, you should set up the

serial ports on the DCM to provide the services you require.

5. When all ports are configured, you can use the DCM to set up attached

Güralp digitizers and digital instruments.

2.2 Power supply

The stand-alone DCM receives its power from lines in its data connectors. All
three of these ports are Güralp standard 10-pin combined serial/power
interfaces. Cables are available from Güralp Systems which enable you to
connect a 9-pin D serial interface and 2-way power connector to any of these
ports.

You can power the DCM from whichever data port is most convenient, whether
or not it is being used for receiving or transmitting data. However, you should
always supply power to the DATA OUT plug if possible, since it is easy to
accidentally short the pins of a male connector. Attached digitizers and sensors
are powered from the same supply as the DCM. Any 12 V DC power supply
may be used; if using batteries, we recommend that you use a unit with low-
voltage disconnect to avoid excessive drain.

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Содержание CMG-DCM

Страница 1: ...this manual is proprietary to G ralp Systems Limited and may not be copied or distributed outside the approved recipient s organisation without the approval of G ralp Systems Limited G ralp Systems L...

Страница 2: ...g the DCM command line through gcf_out 26 Sensor arrays 27 3 4 The DCM as a network data hub 28 Communicating with digitizers 29 Data storage and retrieval 31 Real time data transmission 33 3 5 Troubl...

Страница 3: ...7 HTTP client 57 CD1 0 57 CD1 1 58 DSS 60 SEED 62 5 Actions 65 5 1 Data Viewer 65 The icon bar 66 The stream list 66 5 2 Digitizer Setup 67 General digitizer settings 68 Digitizer output control 69 Tr...

Страница 4: ...90 6 5 Updating the DCM 91 Over the Internet 91 From the hard disk 91 Removing support packages 91 The firmware 92 Appendix A Connector pinouts 94 Appendix A 1 Modular DCM units 94 PORT A and B 94 DA...

Страница 5: ...nding on your site requirements the DCM may be supplied in several formats Although these look different they all share the same internal features A stand alone DCM housed in a high impact copolymer p...

Страница 6: ...suitable for mounting in a standard 19 rack Such a DCM will normally come equipped with eight additional serial ports TTS0 7 and an optional State of Health SOH interface for monitoring or tamper evid...

Страница 7: ...d As a third option an 802 11b Wi Fi module may be installed If the USB client option is installed you can connect the DCM s USB port to a computer and communicate with it as if it were on a private n...

Страница 8: ...ise any serial port can be set to listen for incoming data e g from a connected digitizer or another DCM by setting the serial x service option to gcf_in The DCM will automatically combine this data w...

Страница 9: ...re the station from any browser and download data by HTTP if enabled For maintenance you can log in to the operating system directly over the secure shell protocol SSH and use all the standard Unix Li...

Страница 10: ...of this manual please see the Linux man page for ppp for details or the Linux PPP HOWTO 4 Once communication with the DCM is working you should set up the serial ports on the DCM to provide the servic...

Страница 11: ...o connect the DCM to a local area network follow the instructions in Section 2 4 Connecting to a local network instead Connecting over a serial link The DATA OUT port can be used to connect a DCM to a...

Страница 12: ...ween the DCM s segment and the rest of the network For example if you are using Microsoft Windows XP 1 Connect to the DCM s console over a serial link 2 Because you are connecting the DCM to a single...

Страница 13: ...ars on the Web configuration interface as a serial port allowing you to change the service it provides and the data transfer settings it uses For example if you do not want the internal modem to use P...

Страница 14: ...a static IP address 1 Make a temporary serial connection to the DCM from a local PC You should see the message DCM login 2 Enter root and the administrator password If you have not been given a passwo...

Страница 15: ...RX bytes 12358214 11 7 MiB TX bytes 0 0 0 B Interrupt 76 If the interface is correctly set up its IP address will be shown after inet addr here 192 168 48 187 6 If you are connecting the DCM to a sin...

Страница 16: ...uters on the network are concerned there is no difference between a TCP IP network running over Ethernet and one using 802 11 connections or a mixture of the two Once the 802 11 system is running you...

Страница 17: ...have identically Thus if the DCM is connected to a network over Ethernet you could use all three ports to communicate with digitizers Conversely if you have only one digitizer attached to a stand alon...

Страница 18: ...otocol which ensures that network traffic cannot be read in transit The DCM as supplied accepts connections only over https although this may be altered if required see HTTP server in Section 4 5 Your...

Страница 19: ...s Some important points to note are The DCM uses internal serial and Ethernet ports to communicate with the digitizer and the network Altering the settings under Serial port configuration or Network c...

Страница 20: ...ubsequent grids of checkboxes determine which of the other taps output data For example you could output the Z component at 200 Hz together with all three components at a lower rate You can also set t...

Страница 21: ...u to perform configuration tasks on site However the touch screen imposes some environmental restrictions on the unit For all other DCM units you will need console or network access to the DCM to conf...

Страница 22: ...Once the memory becomes 75 full files are automatically moved to the hard disk until it is less than 50 full See Section 6 1 File systems for details of the algorithm used You can check that the DCM i...

Страница 23: ...the hard disk into any computer that supports the USB Mass Storage standard using a standard USB cable Newer Linux distributions and Microsoft Windows XP have this enabled by default In Windows XP yo...

Страница 24: ...o your data store Alternatively you can open the files directly from the USB disk using Scream or other GCF compatible software 9 When you want to remove the USB disk double click on the Safely Remove...

Страница 25: ...p Systems Scream software allows you to display and record incoming data as well as change the settings of attached digitizers You can do this in addition to recording data on a local hard disk or you...

Страница 26: ...e to unfold the tree to reveal it The digitizer s attached to the DCM will appear underneath the entry for the serial port and you can configure them from within Scream See Scream s documentation for...

Страница 27: ...service output data to the serial inputs of another DCM or AM module which aggregates them all and sends them out over a network connection The DCM can handle multiple data sources with ease using the...

Страница 28: ...manufacture If your DCM is a host you can attach external USB peripherals such as hard disks If it is a client you can attach it to a computer and it will appear as a network interface 3 Connect a G r...

Страница 29: ...name For the option names you should refer to Chapter 4 Configuration options in the DCM manual where each name is given in italics with a description of its action The command syntax to use is gcfgdb...

Страница 30: ...n configure digitizers directly using the above commands However the DCM also provides a Web interface to the digitizer s configuration options 1 Choose the entry for the relevant port under Actions D...

Страница 31: ...can be configured from the Disk menu of the DCM s Web site You can list the files on the hard disk over the Web by selecting Disk files from the menu or from the command line with gfat32 ls If you are...

Страница 32: ...have the capacity to store or the bandwidth to transfer all the data the DCM will produce in each format you have enabled Compiling SEED volumes The DCM can also compile full SEED volumes in real tim...

Страница 33: ...r In a straightforward vault installation we recommend that you leave the DATA OUT port running the getty service for emergency console access and instruct the DCM to act as a server for incoming data...

Страница 34: ...a transfer and select CD1 0 Transmitter or CD1 1 Transmitter Fill in the required data fields and click Save settings The meaning of each field is explained on the page and in Chapter 4 Configuration...

Страница 35: ...g DCM installations I cannot connect to the DCM s DATA OUT port using a terminal program Press ENTER a few times to initiate communication If the DATA OUT port gives a login prompt you should log in w...

Страница 36: ...ange the settings of your DHCP server or connect to the correct IP address for the DCM Check that your local PC can route to the DCM s IP address For example if you are using a cross over Ethernet cab...

Страница 37: ...ber of blocks received on that port Key 0x007005 Blocks 3287 Port 5 name Port A COM6 device dev ttyS2 baud 9600 The DCM is not receiving any data streams Check the connection between the digitizer and...

Страница 38: ...ing at all check the power supply to the digitizer and the cable between it and the DCM The DCM is receiving streams but they do not contain any data If the data you see is zero Increase the Y axis sc...

Страница 39: ...reboot the DCM takes around 2 minutes to begin transmitting The DCM runs a guardian process which monitors the health of the system In some circumstances guardian will need to reboot the DCM to attem...

Страница 40: ...ly has most of these options available to the user However some of the settings described below may not be relevant to your installation and thus will not be available Conversely a DCM may be supplied...

Страница 41: ...imultaneously if you wish you should make sure that you have the capacity to store or the bandwidth to transfer all the data the DCM will produce in each format you have enabled One file will be prepa...

Страница 42: ...ou should also configure the datatransfer cd1_0 options see below disk recordfrom cd1_1 Select yes to have the DCM record data it receives using the CD1 1 protocol If you want to use this option you s...

Страница 43: ...and the DCM runs out of internal memory you may lose data as a result it is recommended that you leave this setting on automatic disk heater A heater is provided in the internal enclosure of the DCM t...

Страница 44: ...l ports operate using frames of 8 data bits no parity bits and one stop bit serial x device The pathname of the Linux device corresponding to this serial port You should not need to change this option...

Страница 45: ...n runs the Linux command mgetty r A port running the mgetty r service will also listen for incoming PPP frames and if it detects one will configure the PPP link according to the etc mgetty sendfax log...

Страница 46: ...should set this option to static and fill in the details below Alternatively you can select dhcp bootp and have the DCM automatically request an address over the network If you choose the dhcp bootp...

Страница 47: ...ss of the DCM A DCM with an IP address in the domain 192 168 1 x would normally use a network address of 192 168 1 0 Static routes In addition to the standard IP routing mechanisms you can define up t...

Страница 48: ...will look for that name in each of the domains specified here in turn You should give the domains to search in their correct order separated by commas The DCM s own domain as given in the net dns dom...

Страница 49: ...t to on the mail server This generally depends on the protocol used to retrieve mail For pop3 mail this port will normally be 110 or 995 for secure POP3 over TLS For imap mail this port will normally...

Страница 50: ...in the fields below to use authenticated SMTP for outgoing mail net mail out password The password needed to log in to the outgoing mail server if using authenticated SMTP net mail out server The host...

Страница 51: ...ng system or no to disallow connections over telnet Select no to disable it By default this method is disabled for security reasons net remoteaccess allow ssh Select yes to allow SSH clients to log in...

Страница 52: ...have a username and password on the list given here If this is the first time you have logged in to the DCM there will be a single user root whose password is factory set To add a new user fill in th...

Страница 53: ...P connections Clicking on either of these entries brings up a page in the work area which enables you to edit the file and its attributes directly including the ownership of the file the permissions r...

Страница 54: ...tributes directly The Web interface does not check that the content of the files will be understood You should ensure that the file is valid before committing any changes referring to the Linux manual...

Страница 55: ...either as an instrument in itself or pass through requests directly to connected equipment datatransfer scream server Select on to allow Scream to connect to the module over a TCP IP connection and re...

Страница 56: ...hard disk or sent out across the network according to the module s configuration If you wish to be able to do this select on datatransfer scream client port The network port number which the DCM shou...

Страница 57: ...assword to access this service HTTP client The DCM also has the ability to retrieve data from another instrument or server on your network over HTTP datatransfer http client Select on if you wish the...

Страница 58: ...nder compression Select on to enable Canadian compression in the outgoing data stream datatransfer cd1 sender channel x The DCM needs to know the CD1 0 channel name for each of the streams you want to...

Страница 59: ...file etc cd11sf cfg is provided allowing you to specify the exact format to be used in outgoing CD1 1 subframes Clicking CD1 1 subframe configuration brings up a page in the work area which enables y...

Страница 60: ...s to be requested from a seismic installation A DSS server is designed to handle many concurrent requests from clients with varying levels of privilege and may prioritize requests according to their o...

Страница 61: ...W component of a particular instrument As soon as the received or generated data fills the buffer it is ready for dispatch dssserver forms the data into a DSS_DAT message and sends it to the client id...

Страница 62: ...ptions Any additional options to send to the DSS server process for advanced usage Remember to click Save changes before you browse away from the page if you want to keep the changes you have made Res...

Страница 63: ...3 V1 050E00 1 6E 07 46 Each line represents an incoming stream from the digitizer the fields are separated by colons and are in turn the digitizer s stream ID a SEED network name for the array or leav...

Страница 64: ...V m s for a stand alone digitizer For integrated digitizers you should use the single ended value quoted the sensitivity of the digitizer in volts per count here 1 6 10 7 V count 0 16 V count This is...

Страница 65: ...ng seismic data either as it arrives or from stored data files The main part of the display shows a selection of the data streams being recorded whilst the bars at the top and bottom allow you to cont...

Страница 66: ...centre all the selected streams in the display The stream list Below the display is a list of all the streams currently being recorded by the DCM Each has a checkbox indicating whether that stream is...

Страница 67: ...ched to the port it will give the message Unable to retrieve configuration from attached instrument In this case you should check that an instrument is connected to the port you clicked and that it is...

Страница 68: ...two 32 bit fields in the header each encoded as a sequence of 6 base 36 numbers representing alphanumeric characters On delivery of the digitizer from the factory the system ID is set to the G ralp Sy...

Страница 69: ...you may inadvertently change the setting Note that not all digitizers support the full range of taps and decimation factors For example the G ralp DM24 allows you to select decimation factors of 2 4 5...

Страница 70: ...will not be output Additionally when the trigger criteria are met the N data stream will be output by Taps 0 2 and 3 at rates of 2000 10 200 Hz 2000 10 4 2 25 Hz and 2000 10 4 2 5 5 Hz and the E data...

Страница 71: ...e selected may be used to determine a trigger The next part of the window lists the channels each with Enable STA LTA and Ratio settings The Enable boxes determine which channels are considered for tr...

Страница 72: ...oving the old one Alternatively you can use the up and down cursor keys to change the values For example setting the STA to 1 second the LTA to 10 seconds and the Ratio to 4 would give rise to the fol...

Страница 73: ...ner frequencies of the pass band of the filter are determined by the Nyquist frequency which is given by the sampling rate of the triggering data The three filter options have pass bands between 10 an...

Страница 74: ...of health and other diagnostic information known as multiplexed Mux channels The number of Mux channels depends on the model and configuration of your digitizer Generally three channels are used to r...

Страница 75: ...talled determines which if any of these commands have any effect The CMG 40T sensor type has no mass lock or centring capabilities so all three buttons are inactive The CMG 3ESP sensor type has manual...

Страница 76: ...mes The hard disk is guaranteed to contain a FAT32 compatible filesystem even if a write operation fails or is aborted suddenly Check disk filesystem Clicking on this button will verify the integrity...

Страница 77: ...storage medium can be found the module will report the error Failed to open USB disk 5 5 Camera If you have attached a compatible camera to the external USB port of the DCM clicking on this link will...

Страница 78: ...terface this is the page you are initially presented with It is divided into a number of sections Network configuration This section displays basic information about the DCM s network setup It is iden...

Страница 79: ...GCF blocks received on this port In this example dev ttySA0 represents the device name of this serial port in the Linux filesystem The remaining information on this line reflects the current setup of...

Страница 80: ...losed never never 10 closed never never 11 closed never never 12 closed never never 13 closed never never 14 closed never never 15 closed never never The columns in the table give in turn the current...

Страница 81: ...ftware Versions The final section lists the software currently installed on the DCM s Linux operating system together with each program s version number If you need to contact G ralp Systems about any...

Страница 82: ...s GCF G ralp Compressed Format files As an option you may be able to configure the DCM to use the miniSEED or sac formats instead see Section 4 2 Disk In automatic mode when the Flash memory becomes m...

Страница 83: ...figure the module and any instruments attached to it You may need to enable and configure some of these methods before you can use them see Chapter 4 Configuration options for more details Most instal...

Страница 84: ...he module through a USB client interface This disk uses a specially designed journalled filesystem which is designed to maintain the integrity of your data at all times Even if a write operation fails...

Страница 85: ...cripts running on the DCM or use programs such as scp to transfer it to a remote machine gfat32 cpt source filename filename on disk Copy a file from the Linux file system onto the disk gfat32 mv file...

Страница 86: ...e options are listed in alphabetical order For example gcfgdbls serial 0 serial 0 baudrate serial 0 handshaking serial 0 ppp serial 0 service gcfgdbset option name new value Enter this command to set...

Страница 87: ...se However you can supply the file name of an alternative database using the c option in which case the command will be performed on that database instead For a detailed description of the configurati...

Страница 88: ...f_in the DCM will automatically interrupt the data flow from the digitizer to allow you to enter commands When you have finished your session press CTRL a then q minicom will ask you if you want to qu...

Страница 89: ...15200 where port and baud are in decimal and Key in hexadecimal The related command serialmap k returns the key ID in decimal Digitizer status The G ralp DM24mk3 digitizer outputs status information a...

Страница 90: ...lines The command tamper provides information about the current state of the DCM tamper lines Issued with no arguments it will output the status of all tamper lines once every 10 seconds Including the...

Страница 91: ...twork using an IP address provided by the DHCP server From the hard disk If your DCM does not have access to the Internet you can update its software from a connected USB disk You will need to make a...

Страница 92: ...his Note that the firmware is not the same as the distribution If you want to ensure that your DCM has all the latest software you should use the upgrade command described above Reinstalling the firmw...

Страница 93: ...aud 19200 Port 2 Key 7002 name ttyS2 device dev ttyS2 baud 19200 Port 3 Key 7003 name ttyS3 device dev ttyS3 baud 19200 flashdcm also has an e option which wipes clean the Flash memory used for the fi...

Страница 94: ...in Function A Power 0 V B Power 10 to 35 V C RS232 RTS D RS232 CTS E RS232 DTR F RS232 DSR G RS232 ground H RS232 CD J RS232 transmit K RS232 receive DATA OUT port This is a standard 10 pin mil spec p...

Страница 95: ...ion A 5 V DC USB Type A pin 1 B Data ve USB Type A pin 2 C Data ve USB Type A pin 3 D 0 V USB Type A pin 4 E Shielding F Switched power 10 to 35 V NETWORK connector This is a standard 6 pin mil spec p...

Страница 96: ...L Data receive ve M Data receive ve R AM console receive S AM console transmit T AM console ground U Tamper switch 5 V GPS 1pps signal W GPS RS232 transmit X GPS RS232 receive Y GPS RS232 ground Z DM...

Страница 97: ...esponse CMG 40_2S_100HZ V CMG 40T 1 or 6T 1 10 s 100 Hz response CMG 40_10S_100HZ V CMG 40 20 s 50 Hz response CMG 40_20S_50HZ V CMG 40 30 s 50 Hz response CMG 40_30S_50HZ V CMG 3T or 3ESP 30 s 50 Hz...

Страница 98: ...Digitizer type codes Digitizer Digitizer type code CMG DM24 mk2 3 or 6 channel CMG DM24 CMG 3TD or 5TD using DM24 mk2 module CMG DM24 CMG DM24S12 including AMS CMG DM24 CMG DM24 mk3 CMG DM24mk3 CMG 6T...

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