ISO 11898-1:2015 Road vehicles — Controller area network (CAN)
Part 1: Data link layer and physical signalling
Road vehicles have been using the Controller Area Network (CAN) bus protocol for over two decades now. It is a robust and versatile bus standard that has been widely adopted in the automotive industry. The CAN bus is used to connect various electronic control units (ECUs) and devices in a vehicle so that they can communicate with each other. In this article, we will take a look at the ISO 11898-1:2015 standard, which specifies the data link layer and physical signalling for the CAN bus.
ISO 11898-1:2015 Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical signalling
The CAN standard is the international standard ISO 11898 for controller area networks (CAN). The aim of the standard is to define a data link layer and physical signalling for CAN.
The standard was first published in 1993 and has since been updated several times. The most recent version, ISO 11898-1:2015, was published in 2015.
The CAN standard defines two types of messages: broadcast messages and unicast messages. Broadcast messages are sent to all nodes on the network, while unicast messages are sent to specific nodes.
The CAN standard also defines four different frame types: data frames, remote frames, error frames, and overload frames. Data frames are used to transfer data between nodes, while remote frames are used to request data from other nodes. Error frames are used to indicate errors on the network, and overload frames are used to indicate that the network is overloaded.
The CAN standard is an important part of the automotive industry as it helps to ensure compatibility between different vehicle components. It also helps to improve safety and reliability by allowing components to communicate with each other.
ISO 11898-2:2016 Road vehicles — Controller area network (CAN) — Part 2: High-speed medium access unit
ISO 11898-2:2016 specifies the data link layer and physical signalling for high-speed controller area networks (CANs), and is applicable to network management data rates up to 1 Mbit/s.
The standard defines two types of high-speed medium access units (MAUs):
- Type A, which uses a single differential voltage pair for transmission and reception;
- Type B, which uses a single ended voltage for transmission and a separate differential voltage pair for reception.
Both types of MAUs are specified for use with twisted pair cables. The standard also defines optional provisions for use with shielded twisted pair cables and optical fiber cables.
What are the benefits of ISO 11898-Road Vehicles?
There are many benefits to using the ISO 11898 standard for road vehicles. This standard provides a high level of compatibility between different types of devices, which makes it easier to connect and use various devices in a road vehicle.
The ISO 11898 standard also helps to improve the reliability of communication between devices, as well as reducing the overall cost of implementing a Controller Area Network (CAN) in a road vehicle.
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