4 the dcm as a network data hub – Guralp Systems CMG-DCM User Manual

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CMG-DCM Data Communications Module

3.4 The DCM as a network data hub

The most flexible way to operate the DCM is as a fully independent

machine on your local area network. To do this:

1. Connect Güralp digitizers to

PORT A and PORT B as necessary,

using the serial data cable provided.

2. If you are using the DCM's USB capabilities, connect your

external hardware or computer to the

USB socket.

Note: In the USB standard, a device is either a host (a computer)

or a

client (a peripheral.) The DCM's USB port can act as either,

depending on the options specified at manufacture. It cannot do
both at the same time.

If your DCM is a

host, you can attach additional USB

peripherals such as hard disks to the

USB socket. If it is a client,

you can attach the

USB socket to a computer, and it will appear

as a network interface.

3. Connect a Güralp combined serial/power cable to the

DATA

OUT port. Make up a connector if necessary, and attach the

power lines to a 12 V DC power supply.

4. Connect the 9-pin serial socket to a computer for configuration.

5. Connect an Ethernet cable to the

NETWORK socket, and set up

the network as described in Section 2.4, page 15.

6. You should now be able to connect to the DCM's Web setup

Issue F