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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.
10 Issue A