The bus needs to be actively driven to the dominant state by one of the nodes. The bus has a recessive state (Logic 1) and a dominant state (logic 0). These lines are usually wound into a twisted pair. For high speeds, it is recommended to to have a 120Ω termination resistor. Signal DescriptionĪ CAN bus consists of two signals (CAN H and CAN L) and terminated at each end with a termination resistor (typically 100Ω to 120Ω). CAN bus is also used in the OBDII vehicle diagnostics standard which is mandatory on modern cars in the US and EU.
CANopen and DeviceNet are common higher layer protocols based on CAN bus and used in industrial automation. CAN bus also features an arbitration method which automatically prioritizes messages and resolves packet collisions.ĬAN is used as a field bus in industrial applications and comprises the lower layer on top of which many higher-layer protocols are based. Speeds up to 1Mbps are supported over distances less than 40m while longer distances are possible at lower speeds (500m at 125Kbps). It is a message based protocol that is able to support multiple nodes. It has several built in features that make it robust and noise tolerant. The Controller Area Network (CAN) bus is a communications standard with its origins in the automotive industry. For more detailed information refer to the links provided in the Resource and Going Further. Heads up! This section gives a brief overview of some of the important features of CAN bus.
\MyDocuments\Arduino\libraries\AltSoftSerial-master. The final directory structure should be.Unzip into the Arduino libraries folder: **.\MyDocuments\Arduino\libraries**.Unzip the AltSoftSerial-master.zip folder.
Rs485 bus download#
Rs485 bus install#
To manually install the AST AltSoftSerial library: \MyDocuments\Arduino\libraries\AST_RS485_Arduino_Library-master.
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