Tagged Questions

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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19 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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0answers
53 views

How to implement CAN Bus Communication using STM32F429? [on hold]

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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0answers
42 views

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?
2
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2answers
109 views

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) ...
2
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2answers
329 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 ...
1
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1answer
59 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 ...
4
votes
1answer
72 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 ...
1
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1answer
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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1answer
44 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.
2
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2answers
75 views

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 ...
1
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1answer
76 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 ...
1
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1answer
103 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 ...
3
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1answer
273 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 ...
1
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1answer
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 ...
2
votes
1answer
170 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 ...
2
votes
1answer
263 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 ...
0
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2answers
283 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)?
5
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2answers
521 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 ...
0
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1answer
132 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 ...
3
votes
3answers
714 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 ...
2
votes
1answer
173 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 ...
4
votes
3answers
339 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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2answers
267 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 ...
0
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1answer
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 ...
2
votes
0answers
302 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 ...
3
votes
1answer
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 ...
0
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2answers
175 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 ...
1
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1answer
828 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) ...
0
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0answers
102 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 ...
3
votes
1answer
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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votes
1answer
93 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: ...
5
votes
1answer
251 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 ...
2
votes
1answer
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, ...
0
votes
2answers
850 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 - ...
2
votes
1answer
780 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? ...
1
vote
1answer
144 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 ...
1
vote
1answer
199 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?
4
votes
1answer
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 ...
4
votes
3answers
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 ...
2
votes
1answer
481 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 ...
2
votes
0answers
64 views

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 ...
3
votes
2answers
267 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 ...
1
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2answers
248 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 ...
1
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0answers
206 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 ...
2
votes
3answers
587 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 ...
0
votes
0answers
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 ...
0
votes
1answer
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 ...
1
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2answers
392 views

What is the most efficient way to debug CANbus from a PC?

I have several working and inter-operable boards using CANbus. I've shipped hundreds of products using these boards, with no problems. One of my customers is now saying that his fault log shows ...
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votes
1answer
326 views

USB to OBD-II Converter

I want to make a scan-tool that works via a PC for my Thesis. To test it I have bought an ECU simulator (ECU-Sim 2000) with a CAN bus. I'm planning to make it using an FT232H USB to serial chip and a ...
1
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1answer
1k views

PIC18F25K80 can transmit over CAN but can't receive

I've built a prototype circuit on a solder breadboard. I've connected the PIC18F25K80 to MCP2551 as shown in the schematic for ...