CMG-DCM / AM - Güralp Systems Limited

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CMG-DCM Data Communications Module messages. In addition, the DCM can be configured to act as a data client, receiving GCF and CD1.0/1.1 data streams, combining these streams and storing or retransmitting them as appropriate. See Chapter 3, page 24, for full details. 10 Issue F
Operator's guide 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: 2.2 Power supply 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. 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 December 2006 11
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CMG-DCM / AM - Güralp Systems Limited

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