Minicom Advanced Systems CMG-DCM manual Serial port services, Network services

CMG-DCM

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.

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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-rservice 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 (Gü ralp Compressed Format) data by setting the serial.x.service option 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 serial.x.service option 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 serial.x.service option 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.

•Both mgetty and mgetty-rcan recognize incoming PPP connections and will automatically run a PPP daemon if you attempt to connect to the DCM in this way.

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

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