CANFDNET-400U
High-performance Four-channel CANFD Bus-to-Ethernet Converter User Manual
©2021 Guangzhou ZLG Microelectronics Technology Corp.,Ltd.
5
User Manual
is off
CAN
CAN communication
status indicator
Flashing red
light
There is an error in CAN communication,
and an error frame is received
Green
flashing light
The CAN side is transmitting data properly
COM
RS-232/485/422
communication
status indication
Flashing red
light
Baud rate mismatch error occurs in serial
communication
Green
flashing light
The serial port side is transmitting data
properly
CFG
Configuration status
indicators
The indicator
is off
In conversion working mode, normal data
forwarding
Normally on
In configuration mode. You can configure
parameters and perform other operations
Flash
In BootLoader, firmware upgrade in
progress
2.4 Buttons
Table 2.3 Button operations
Operation
Function
ON
Make the converter in normal working state and perform normal data forwarding
CFG
Put the converter in the configured state. Normal data conversion is impossible in the
configured state. Only in the configuration state can the host computer or AT commands be
used for parameter configuration
2.5 CAN Bus Connection
The physical layer mainly transmits inter-device signals, converts various information
into transmittable physical signals (usually electrical or optical signals), and transmits
these signals to other target devices. For this purpose, CAN-bus has made detailed
regulations on signal levels, cables and connectors used for communication.
Two standards are released after CAN-bus was standardized by ISO, namely
ISO11898-2 (125kbps-1Mbps high-speed communication standard) and ISO11898-3
(low-speed communication standard less than 125 kbps).
The data link layer is the same for both high-speed CAN and fault-tolerant CAN
except for the physical layer. The CAN transceiver determines the bus level based on the
voltage difference between the two cables. This transmission method is called differential
transmission. There are only two possibilities for the level signal transmitted on the cable,
namely the dominant level and the recessive level. The dominant level indicates logic 0,
and the recessive level indicates logic 1. Table 2.4 lists the high-speed CAN electrical
characteristics.
