NEC MPI4E Raspberry Pi Compute Module Setup Guide

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3.3 LAN connections

The Compute Module Interface Board features an onboard Gigabit LAN connection for direct high-speed

connection to the Compute Module.

Additionally, an internal 10/100 Mbps interface on the Interface Board and LAN switch within the display

provides network connectivity to both the display and Raspberry Pi Compute Module using a single

network connection.

• The display’s LAN control interface and the Compute Module will have their own IP address and

network settings and can be configured via the display’s OSD and internal web page.

• The IP address and network settings of the Compute Module are configured within the OS

running on it.

• (Multiple LAN port models only

) Two of the display’s LAN switch ports are available externally

for daisy-chaining other devices.

o LAN1 port should be used to connect to the network.

o LAN2 output can be used to daisy-chain connect other LAN devices or displays.

Note: The internal 10/100 Mbps interface uses LAN controller (LAN9514) connected to the Compute

Module via USB 2.0. It is necessary to enable USB host mode support on the OS to use this interface.

See 5.1 Enabling the onboard USB 2.0 controller on page 33 for more information.

Important: Both the Gigabit and 10/100 Mbps LAN interfaces will be assigned a MAC address based

on the serial number of the Compute Module. At the time of writing, Raspberry Pi OS will assign

identical MAC and IP addresses to both interfaces. This will lead to an illegal ethernet condition if both

network ports are connected to the same network and may result in degraded or no network

connectivity.

It is possible to assign a different MAC address to one of the network interfaces to avoid this. See

section 7.22 on page 58.

Note: The LAN2 connection should be used for connecting to other displays that are daisy-chained or to

other LAN devices. Functions such as AUTO ID and AUTO IP will not work correctly if displays are not

daisy-chained correctly using the LAN1 and LAN2 connections.

Current models with multiple LAN ports on the terminal panel: MA431, MA491, MA551, P435, P495, P555

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NEC MPI4E RaspberryPi 4 System on a Chip Solution