Guralp Systems CMG-DCM - Manual (Page 11)

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:
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
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