CAN stands for Controller Area Network and is a bus often used in automotive applications. It is a two-wire differential protocol and works on baud rates from 10 kbits/sec to 1 Mbits/sec.

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Baudrate and BTR0/BTR1

I am creating an application that uses standard function that sets bitrate. The parameters required are BTR0 and BTR1. But the user of my application will enter the standard value of the Baudrate (eg. ...
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CAN BUS Acknowledgment error

I am using STM32F429 CAN bus Program with TJA1041A as CAN Transreciver.The Problem is the messages are not getting acknowledged and herewith I am attaching the code for further reference.I am using ...
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46 views

Single wire CAN // Saab 9-3 I-Bus // GMLAN

I'm trying to control an instrument cluster from a 2008 Saab 9-3. It has 2 pins marked for I-Bus (both wires are green, continuity test shows they are tied together as shown here: Some sites also ...
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65 views

How to implement CAN Bus Communication using STM32F429? [closed]

Does anyone have any ideas abou implementing a CAN Bus communication with a STM32F429 MCU? I am looking for any references regarding CAN Bus regarding this microcontroller.
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How long bus can be implemented(in feet) without exceeding bit length bl = 1

Need to find the length of the CANT bus without exceeding bit length bl = 1; with consideration w = 1.1Mbps and v = 0.55 c. Any help with the formula?
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What is the usage of this resistor?

I'm thinking about this part of this board : As you can see, there is a resistor in the red rectangle (R26). my question is what is the usage of this resistor? Well being a resistor for D14(CANRX) ...
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332 views

Best method to transfer two int percentage values over a CAN bus

I have two integers: int A is a value from -100 until 0 and int B is a value from 0 to 100 What is the most effective way to put this into a CAN message and decode it again at the other ...
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63 views

LaunchPad development board talking to itself using a CAN bus

I have one Texas Instruments Tiva-C Series TM4C123GXL LaunchPad and two MCP2551 transceivers. I am trying to send and receive messages via a controller area network (CAN) bus. Is it possible to do ...
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74 views

How can I determine a maximum run length for CANbus?

I'm using CANbus to communicate between two circuit boards. 120 ohm termination resistors on either end. Transceivers are MCP2561 and ISO1050. Bit rate is in the hundreds of kilobits/second. Medium is ...
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57 views

Controller area network voltages

The CAN bus has CAN-High and CAN-Low lines. Normally, in the recessive state the voltages are each 2.5 V and in the dominant state the CAN-High line goes to 3.5 V and the CAN-Low line goes ...
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46 views

NXP PCA82C250 CAN controller interface

What is the function of the \$V_{ref}\$ pin for the PCA82C250 CAN controller? A complete datasheet is available.
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Question about communication using a controller area network (CAN)

I am trying to make a test CAN loop on a breadboard and I want to try reading and writing to it using an mbed. I found an example circuit and some test code for reading and writing from a CAN loop ...
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77 views

How to transmit CAN signals wirelessly without line of sight (LOS)

I have a scenario where I have an OBD-II interface transmitting data via CAN across six wires to a display. I will have power on either side of the wires, but I cannot assume that the wires will have ...
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105 views

CAN BUS MESSAGES DESIGN SOFTWARE [closed]

I am currently designing with the PIC32 Micros and the 2 embedded CAN bus Controllers As the CAN bus architecture from node to node can be very complex with CAN messages, nodes filters, masks, CAN ...
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291 views

What's the maximum CAN bus frame (message) rate at 125 kbit/s?

My CAN bus is running at 125 kbit/s and is using extended frame format exclusively. I would like to know what's the maximum rate of CAN frame I can send out. Suppose the data length is always ...
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144 views

What could be used to send induced/coupled CAN-BUS signal

My problem I am experiencing is with the circuitry or IC combination to follow. I don't need a answer of what exact IC models I need, as that would be plain stupid. What I asked originally about the ...
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1answer
184 views

CAN communication between two ARM MCU's (LPC2129)

I am trying to communicate between two LPC2129 microcontrollers, one as transmitter and the other as receiver, using interrupts to transmit and receive the message. The transmit and receive ...
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271 views

CAN Bus Off when operating with two nodes

I have two nodes A and B operating on a CAN bus. I have cut the bus off and Node A reached the error passive state due to the lack of ack from ...
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291 views

Eagle library for MCP2551

I need to make a PCB, and the only software I have is EAGLE. All the other parts are listed in my libraries, but where can I find a library that has MCP2551 (CAN transceiver)?
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537 views

What exactly is “dominant” and “recessive”?

I am reading data sheets on the LIN bus, but apparently the same terminology is used for CAN. What does "recessive" and "dominant" stand for, e.g ...
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134 views

Listen Only Mode in CAN and Message Validity

Most controllers have a "Listen Only Mode" or "CANalyzer Mode" in which CAN module doesn't acknowledge any message but it will read the message silently. Assuming there is only two nodes on the bus ...
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742 views

Running CAN bus with RS-485 transceiver

Recently I had a discussion whether one could use RS-485 transceivers for a CAN-bus network in order to gain the flexibility to use the same hardware either in a CAN-environment or in half-duplex ...
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177 views

CAN connection help needed

I bought the IAR Kickstarter kit to work with the SM470R1B1M-HT (Texas Instruments) microcontroller. I would like to implement CAN communication between the microcontroller and a PC. I need to send ...
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352 views

Is the CAN bus protocol a master and slave protocol?

I am investigating if the CAN bus will work for the projects I am building at the moment. I want to create a bunch of input/output controllers that will accept/buffer commands, execute them and then ...
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270 views

How to properly wire 2 CAN transceivers to the same CANH and CANL

I'm attempting to design a system with 2 CAN transceivers, a High speed and Low speed that use the same CANH and CANL lines, like so: I was planning on using 4 MOSFETs or 4 Relays connected to the ...
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165 views

CAN communication with the SM470R1B1M-HT microcontroller

I bought the IAR Kickstarter kit to work with the SM470R1B1M-HT (Texas Instruments) microcontroller. I would like to implement CAN communication between the microcontroller and a PC. I need to send ...
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307 views

Android CAN bus connectivity via Bluetooth (or USB) [closed]

I'd like to read sensor data from existing CAN buses using a bluetooth (preferably, though USB would also work) device of some sort. Trouble is, I've never done CAN bus, bluetooth or android ...
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78 views

Understanding the guaranteed data consistency within CAN network

I am reading the CAN spec and it says the following about data consistency: Data Consistency: Within a CAN network it is guaranteed that a message is simultaneously accepted either by all nodes or ...
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181 views

Isolation of CAN-High and CAN-Low signals [closed]

I have to isolate the signals CAN-High and CAN-Low on a CAN bus. Is there an isolated CAN repeater (something like IXXAT's CAN-Repeater - 110 × 75 × 22 mm) which would be ...
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841 views

What do chips like ELM327 and STN1110 do?

What problems are the chips ELM327 and STN1110 solving? If I connect the necessary interface ICs (I mean dumb ICs, like level shifters, inverters, etc., not pre-programmed devices like ELM327) ...
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104 views

OBD2 CAN digital analysis yields signal only on CAN Low

Since I don't seem to find the OBD2 CAN specification anywhere on the internet, I am trying to reverse engineer the signaling done so that in the end I can develop a piece of hardware that will act as ...
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83 views

CAN bus ESD protection

For a CAN bus application, is it correct to connect an ESD protection IC to GND, or chasis of the device?
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94 views

Data transmission via CAN

I'm trying to send data out via CAN rather than using a serial port. I could output the following via serial port without a problem using FIFO buffer: ...
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253 views

CAN bus troubleshooting. How? [closed]

I am trying to connect ICP CON i-7565 (USB <-> CAN interface) to a custom made device (supporting CAN 2.0B, proved to work with PCL-841 card). Although I think I have configured the Baud rate and ...
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2k views

Controller Area Network (CAN), high speed and low speed

Is the difference between high- and low-speed CAN only with respect to baud rate values? Is the CAN transceiver programmable for a range of speeds or is it fixed for a specific value? For example, ...
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864 views

Reading from CAN bus of a Chevrolet Cruze using an Arduino Uno

I'm using the Arduino Uno, CAN bus shield, and OBDII to DB9 Cable using their provided libraries. I was only able to initialize it. Readings: While connected to the car: CAN-High: 2.7 V - ...
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790 views

Reading and writing CAN messages through ELM327

I have an OBD-II cable, and an UART-to-OBD-II board which has the ELM327 IC in it. I want to communicate with my ECU by sending-receiving CAN messages. Is it possible to communicate through ELM 327? ...
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148 views

RS-485 / CAN signal levels

From what I know, CAN at the physical layer in the "recessive" state just lets pull-up/pull-down do the work. Does that mean the rise time is theoretical slower than a RS-485 transceiver? And about ...
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206 views

Is it possible to have any CAN baudrate?

Is it possible to have any CAN baud values? e.g. 507 baud If not, on what basis is the standard values are derived?
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127 views

Why are my microcontroller and CAN transceiver failing?

I have a PCB with a dsPIC 30F6012a and a TI ISO1050 isolated transceiver. This is a combination of devices I've used regularly. The two chips' CAN TX and RX are wired directly to each other with no ...
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314 views

Designing CAN for a 3.3V system

I am currently designing a CAN system for a 3.3 V board and I am looking for some insight regarding CAN transceivers. These are my goals from the CAN system: No influence on the CAN bus if in ...
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494 views

GPS over CAN bus

How is GPS data typically sent over CAN bus? Some context: I'm looking to simulate sending and for receiving GPS data (using a Linux-running embedded device with CAN interface), to work side-by-side ...
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Do you consider this design as an application layer on top of the CAN protocol?

This is a follow up question from my previous question about How do I program 2 CAN nodes to transmit continuously in succession? I'm planning to add another layer on top of the CAN protocol and I ...
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269 views

How do I program 2 CAN nodes to transmit continuously in succession?

Suppose I have three CAN nodes: A, B and C. We know that when two nodes transmit at the same time, the node that has the least SID will prevail over the bus and the other node will have to give the ...
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249 views

Industrial RF replacement for Xbee based UART communication

I have used Xbee's several times and I am working on a basic project which involves multiple MCUs talking to a central MCU and sending some updates such as Temp, GPS and etc... Very basic setting ...
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209 views

Issue with CAN communication

I'm new to CAN and currently having problem with a setup. The image shows how my devices are connected to each other. I'm using the canutils Linux package to send messages (Linux uses its network ...
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598 views

I²C, SPI, CAN protocols and the OSI model

Is there a reference or what is the explanation for I²C and SPI being just physical layer protocols in the OSI model (I know that this model is for communication and maybe not exactly for on-board ...
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75 views

USB to COM line to replace USB-CAN device

Can I use a USB to COM line to replace USB-CAN device? I mean "USB to COM line" is something like this: USB-COM image And a USB-CAN image is here: USB-CAN image I'm working under Ubuntu 12.04 and ...
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175 views

Finding timestamps of CAN messages received by a microcontroller

The microcontroller kit (STM32F4 discovery kit) which I am using has CAN and USB support. I want to program my microcontroller so that each time when a CAN message is received, it is transmitted via ...