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1.4 ETHERNET TCP/IP CONNECTION
1.4.1 Network precautions: before you start
The Primax PCOM board, provided in your kit is designed to connect to a network over Ethernet. As with any system,
however, some precautions are in order before you connect. Whenever new hardware or software is added to a
network, it is always advisable to create a separate test network that is isolated from your LAN. This allows testing the
new system in a controlled environment and minimizes the possibilities of network interference from the new equipment.
The major sources of potential interference include:

Addressing. Each device on the network must have a unique address. If Dynamic Host Configuration Protocol
(DHCP) is in use, The Primax PCOM board will automatically acquire a valid IP address. If DHCP is not used,
or a fixed address is required, adding the board to the network without assigning an address may create
network conflicts.

Traffic levels. While the on-board Ethernet controller will filter out unwanted messages, a highly loaded
network with many broadcast messages may place a sizable burden on the PCOM board.

Data Security. Although it is unlikely that the addition of a single device will compromise the integrity or privacy
of sensitive information, it is always a good idea to perform extensive testing with new equipment before adding
it to a secure network.

Experimentation. Even as a simple microcontroller-based device, the PCOM is capable of generating a high
volume of network traffic which may severely disrupt normal network operations.
1.4.2 Using PCOM board with a local host system
The
PCOM can communicate directly with a properly configured desktop system, known here as a local host system . In
this configuration, the host system can communicate and configure the board through its network connection; it can also
configure the board through the serial port. When configured this way, the setup is referred to as a
test system .
The PCOM can also communicate to a network and a local host system separately. In this setup, the board participates
on the network through its Ethernet connection. At the same time, it is connected to the local host system through the
serial port, from which it can be directly configured.
To function as a local host, the system must meet the following basic requirements:

Any computer system capable of network communication.

Standard Ethernet card or integrated adapter, capable of supporting 100 Mbps operation, with RJ45 connector.

One available standard serial port with a matching COM port available through the operating system.

Any operating system with TCP/IP Stack software.

Any terminal emulation package, such as HyperTerminal for Microsoft® Windows® operating system (optional
for configuring the PCOM board’s IP Address).
1.4.3 Connecting the PCOM board
There are two basic network configurations for the PCOM board: direct connection to a network and connection to a
local host system through a crossover cable. If DHCP is not enabled on the network, the board will need to be
configured before a direct network connection can be used. If you are connecting the
PCOM board to a DHCP-enabled
network, follow the steps in Section “Connecting to a Network” .
If you are using the board for the first time on a network using fixed IP addresses, follow the steps in Section
“Connecting directly to a Host System”. Once the IP address is configured the first time, you will be able to connect
the board directly to the network as described in Section “Connecting to a Network” w ithout using a local host. If you
are connecting the board to a local host in a test system configuration, you will also follow the steps in Section
connecting directly to a Host System. If DHCP is enabled on the local host, the board will configure itself. Otherwise,
you will need to configure both the host and board IP addresses according to the directions in Section “Configuring
the PCOM Board”.
1.4.4 Connecting to a Network