CMG-DCM / AM - Güralp Systems Limited

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CMG-DCM Data Communications Module 1.1 Inside the DCM The DCM's configuration is maintained by an internal database. All of the flexibility of the unit is provided through this configuration database. Before you deploy the DCM, you will need to configure it for your needs, either using its on-board Web server or over a direct serial link. The two main areas which need to be configured determine the different services which the DCM provides from its serial and network ports. Serial port services You can use either the DCM's console or its Web configuration interface to configure the serial data ports. The serial.x.service configuration option determines which service each port provides. • The simplest service is getty. This creates a console port, which you can use to log in to the Linux operating system of the DCM directly. • The mgetty-r service is similar, but is more suited for serial links including modems, in which the link is not always active. This is the default option. • Any of the serial ports on the DCM can be directed to transmit GCF (Güralp Compressed Format) data by setting the service for that port to gcf_out. You can then run Scream! or other software on your computer to receive the data. You will not be able to access the Web configuration interface using this service, although you may be able to configure attached digitizers from Scream!. • Likewise, any serial port can be set to listen for incoming data (e.g. from a connected digitizer or another DCM) by setting the service to gcf_in. The DCM will automatically combine this data with any other streams it is receiving, and send it on using all gcf_out ports and any other transmission methods which have been configured. • You can log in to the Linux operating system over a modem link by setting the service to mgetty. mgetty listens for incoming calls from your computer and sets up a login session for you. You may need to configure minicom or hypertrm to communicate with your own modem before you can do this. 8 Issue F
Operator's guide • Both mgetty and mgetty-r can recognize incoming PPP connections and will automatically run a PPP daemon if you attempt to connect to the DCM in this way. • Specialist services cnsn_in, cnsn_out and dss_sum are also provided. Network services Because the DCM is a fully-fledged Linux machine, you will need to set up networking before you can use it. Advanced networking is beyond the scope of this manual. For a basic setup, you will need to perform the following actions: 1. Assign the DCM an IP address. By default, the DCM will try and use DHCP (Dynamic Host Configuration Protocol) to find its own IP address. However, this requires a DHCP server on your network. If you do not have a DHCP server, you will have to set the IP address yourself. 2. Find out the IP address the DCM is using (if you have not set it yourself). 3. If necessary, configure your own computer's IP address so that it can communicate with the DCM. See Section 2.4, page 15, for full details. Once you have connected the DCM to your local network or to the Internet, you can use a wide range of methods to retrieve data from it. • All DCM units feature an on-board Web server, which allows you to monitor and configure 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/Linux tools. • A GCF server can be set up to transmit data to any application that supports the GCF format (such as Scream!, Antelope, or Earthworm.) • The DCM can act as a CD1.0 or CD1.1 transmitter to a specified client, or to multiple clients as an option. • Optionally, the DCM can also receive and process AutoDRM December 2006 9
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CMG-DCM / AM - Güralp Systems Limited

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