UMAX140900RST. Ethernet to CAN Converter. Version 1
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2.2 LED Indicators
There are three LED indicators on the front panel of the converter. A bi-
color “Power” indicator shows
whether the unit is powered. It turns red when there is an error on the CAN power output.
The two Ethernet LED indicators are hardwired to the PHY chip and show the transmission speed
“Ethernet 10/100” and the link/activity status “Ethernet Link/Act”, see Table 1:
Table 1. Converter LED Indicators
Name
Color
Description
Power
Green/Red
Off
The converter is not powered.
Green
The converter is powered. CAN Power
Output is in normal condition.
Red
CAN Power Output is in a fault condition.
Ethernet 10/100
Green
On
Ethernet speed is 100 Mbit/s
Off
Ethernet speed is 10 Mbit/s
Ethernet Link/Act
Green
On
Ethernet link is up
Off
Ethernet link is down
Blinking
Ethernet link is up and active
2.3 Firmware Organization
The Ethernet to CAN Converter firmware contains two independent parts: the
Communication
Device
and the
Web Server
, see Figure 2:
Ethernet
CAN
Communication Device
Web Server
IP network
Figure 2. Converter Firmware Architecture
The
Communication Device
is responsible for the protocol conversion between CAN and
Ethernet networks and the
Web Server
provides the converter user interface.
Both the
Communication Device
and the
Web Server
use the same IP network interface. The
IP address resolution is provided by the ARP protocol.
2.3.1 Communication Device
The
Communication Device
utilizes a proprietary communication protocol to communicate
CAN messages and other auxiliary information over the Ethernet. It supports a client/server
communication model. In this model, the
Communication Device
has a primary server role,
allowing external clients to establish independent connections with the device.
