Minicom Advanced Systems manual Installing the CMG-DCM, Overview, Power supply

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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 Gü ralp digitizers and digital instruments.

2.2Power supply

The stand-aloneDCM receives its power from lines in its data connectors. All three of these ports are Gü ralp standard 10-pin combined serial/power interfaces. Cables are available from Gür alp 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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Contents CMG-DCM Table of Contents December Inside the DCM Introduction CMG-DCM Inside the DCM Serial port services Network servicesSee .4, Connecting to a local network for full details Power supply Installing the CMG-DCMOverview Connecting to a single computer Connecting over a serial linkConnecting over Ethernet 192.168.0.xUsing an internal modem Connecting over USBConnecting to a local network Gcfgdbset option-namenew-value Wi-Fi Connecting to the InternetConnecting digitizers and external hardware Setting up the CMG-DCMWeb setup Setting up digitizers Using Scream General notes UsageDCM as a data store Gnblocks port-number Page CMG-DCM DCM as a GCF data source Accessing the DCM command line through gcfout Sensor arrays DCM as a network data hub Communicating with digitizers Configuring digitizers Data storage and retrieval Using miniSEED format Real-time data transmission CD1.0 and CD1.1 Troubleshooting DCM installations Cannot connect to the DCMs Scream! server Cannot see the DCMs Web site over Http or HttpsCannot Gcfping the DCMs Scream! server Can Gcfping the DCMs Scream! server, but no data appears DCM is not receiving any data streamsUse the Serial port configuration → port name Web page, or DCM is receiving streams, but they do not contain any data143032 up 34 min, load average 1.24, 1.32 Configuration options GeneralDisk CMG-DCM Serial port configuration CMG-DCM Page Network configuration Ethernet portStatic routes DNS setup Incoming mail setup Outgoing mail setup Remote access Administrators PPP Mgetty Data transfer ScreamScream! Client AutoDRMHttp client Http serverCD1.0 CD1.1 CD1.1 subframe configuration DSS Server configuration Seed Page CMG-DCM Actions Data ViewerIcon bar Stream listDigitizer Setup General digitizer settings Digitizer output control CMG-DCM Trigger criteria CMG-DCM Tap # Rate Bandwidth Samples/s Auxiliary Mux channels Sensor mass control Check disk filesystem Disk toolsPartition, and format disk Flush flashCamera Disk filesRecent Log Entries Network configuration SummaryDNS configuration Data Out Port, Serial Port A, Serial Port BTamper lines Flash StatusDisk Status Software Versions Inside the DCM File systems CMG-DCM Command line tools Configuration Digitizer console access Monitoring Data flowDigitizer status Tamper lines From the hard disk Updating the DCMOver the Internet Removing support packagesFirmware Libgconfigdb Port a and B Appendix a Connector pinoutsAppendix A.1 Modular DCM units Data OUT portUSB connector Network connectorAppendix A.2 Integrated DCM units DM/AM module outputAppendix B Sensor and digitizer types Appendix B.1 Sensor response codesAppendix B.2 Digitizer type codes Digitizer