Minicom Advanced Systems CMG-DCM Connecting to a single computer, Connecting over a serial link

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Operator's guide

A rack-mountedDCM has a separate POWER IN connector on the back panel, which should be attached to a 12 V DC supply. There is also a POWER OUT connector on this panel, which allows you to daisy-chain several DCM units together. The POWER OUT connector is provided merely for convenience: lines from the POWER IN connector pass straight through.

An integrated DCM receives its 12 V DC power from two pins in its single connector. See Appendix A, “Connector pinouts” for the positions of these pins.

2.3 Connecting to a single computer

In autonomous or temporary installations, you will only need to connect the DCM to one computer (e.g. a laptop) for initial configuration. Follow these instructions to make the DCM communicate with your computer.

Note that your computer must either have an RS232 (serial) port for initial connection, or be running its own DHCP server. DHCP servers are available for Windows, but are not supplied as standard.

If you want to 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 single computer through a direct serial link. This link can be used to log in to the Linux operating system of the DCM and transfer files. It is most useful for maintenance and troubleshooting over a low-bandwidth connection, and for initial setup.

To communicate over a serial link:

1.Connect an RS232 reverse serial cable between the DCM and your computer. A suitable cable should have been supplied with the unit.

2.Run a terminal emulation program on the computer. The built-in programs minicom for Linux, and hypertrm for Microsoft Windows, can be used for this.

3.Configure the baud rate of the serial link. By default, the DCM uses a baud rate of 115200, with 8 data bits, no parity bit, and one stop bit, and without flow control.

4.Log in with your username and password, or root if you have not yet

created one. See http://www.faqs.org/docs/Linux- HOWTO/Text-Terminal-HOWTO.html for full information on how to set up terminal emulation under Linux.

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Contents CMG-DCM Table of Contents December Inside the DCM Introduction CMG-DCM Inside the DCM Network services Serial port servicesSee .4, Connecting to a local network for full details Overview Installing the CMG-DCMPower supply Connecting over a serial link Connecting to a single computer192.168.0.x Connecting over EthernetConnecting over USB Using an internal modemConnecting to a local network Gcfgdbset option-namenew-value Connecting to the Internet Wi-FiSetting up the CMG-DCM Connecting digitizers and external hardwareWeb setup Setting up digitizers Using Scream DCM as a data store UsageGeneral notes 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 Gcfping the DCMs Scream! server Cannot see the DCMs Web site over Http or HttpsCannot connect to the DCMs Scream! server DCM is not receiving any data streams Can Gcfping the DCMs Scream! server, but no data appearsDCM is receiving streams, but they do not contain any data Use the Serial port configuration → port name Web page, or143032 up 34 min, load average 1.24, 1.32 General Configuration optionsDisk CMG-DCM Serial port configuration CMG-DCM Page Ethernet port Network configurationStatic routes DNS setup Incoming mail setup Outgoing mail setup Remote access Administrators PPP Mgetty Scream Data transferAutoDRM Scream! ClientCD1.0 Http serverHttp client CD1.1 CD1.1 subframe configuration DSS Server configuration Seed Page CMG-DCM Data Viewer ActionsStream list Icon barDigitizer Setup General digitizer settings Digitizer output control CMG-DCM Trigger criteria CMG-DCM Tap # Rate Bandwidth Samples/s Auxiliary Mux channels Sensor mass control Flush flash Disk toolsPartition, and format disk Check disk filesystemRecent Log Entries Disk filesCamera Summary Network configurationData Out Port, Serial Port A, Serial Port B DNS configurationDisk Status Flash StatusTamper lines Software Versions Inside the DCM File systems CMG-DCM Command line tools Configuration Digitizer console access Data flow MonitoringDigitizer status Tamper lines Removing support packages Updating the DCMOver the Internet From the hard diskFirmware Libgconfigdb Data OUT port Appendix a Connector pinoutsAppendix A.1 Modular DCM units Port a and BNetwork connector USB connectorDM/AM module output Appendix A.2 Integrated DCM unitsAppendix B.1 Sensor response codes Appendix B Sensor and digitizer typesDigitizer Appendix B.2 Digitizer type codes
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