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Ⅰ. What is
CAN bus communication:
CAN (Controller Area Network) is a serial
communication protocol bus for real-time applications. It belongs to the
category of fieldbus. It is a serial communication network that effectively
supports distributed control systems. It is a multi-master bus that allows
multiple devices to communicate without central control. Due to its high
reliability, flexibility and real-time performance, CAN bus is widely used in
automotive electronics, industrial automation, robotics and other fields. For
example, in automobiles, CAN bus is used to control key components such as
engine management, anti-lock braking system (ABS), and airbag system.
Ⅱ. Characteristics of CAN bus:
- Multi-master
communication: All nodes are equal, and any node can actively initiate
communication, and there is no master-slave relationship.
- Arbitration
mechanism: When multiple nodes try to send data at the same time,
conflicts are resolved through conflict detection and priority arbitration
mechanisms.
- High reliability: The
CAN bus is designed with error detection and error handling mechanisms,
which can automatically resend error frames to ensure the reliability of
data transmission.
- Flexible data length:
CAN supports data frames of different lengths, ranging from 8 bytes to 8K
bytes.
Ⅲ. Frame types of CAN communication:
- Data frame: a frame
used by the sending unit to transmit data to the receiving unit.
- Remote frame (remote
frame): a frame used by the receiving unit to request data from the
sending unit with the same ID. The remote frame has no data segment.
- Error frame: a frame
used to notify other units of errors when errors are detected when
receiving and sending messages. The error frame consists of an error flag
and an error delimiter.
- Overload frame: a
frame used by the receiving unit to notify that it has not yet completed
the reception preparation. The overload frame consists of an overload flag
and an overload delimiter.
- Frame interval: a
frame used to separate data frames and remote control frames from previous
frames. Data frames and remote control frames can be separated from any
previous frames (data frames, remote control frames, error frames,
overload frames) by inserting a frame interval. However, a frame interval
cannot be inserted before overload frames and error frames.
Ⅳ.Our Ebyte CAN series equipment:
Our company has a wealth of CAN communication equipment, such as ECAN-401 (isolated version)/ECAN-401S (non-isolated version) that realizes bidirectional conversion between CAN and RS485/RS232/RS422 serial port different protocol data; ECAN-S01, a small intelligent protocol conversion module that realizes bidirectional conversion between CAN and TTL different protocol data; ECAN-101, a small device that realizes bidirectional conversion between CAN and RS485 different protocol data; ECAN-U01 (isolated version)/ECAN-U01S (non-isolated version), a high-performance CAN-BUS bus communication analyzer with integrated 2-way CAN interface, and equipment for protocol conversion between CAN and optical fiber, industrial Ethernet, etc.
For details visit: https://ebyteiot.com/