Does anyone using CANcaseXL experience?

[HOYO]

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TroyK 已寫：

It is better that you look at the vxlapi.dll documentation and understand what is going on, but I added a CAN receive example to the community document anyway.

CAN Receive Example.vi added due to popular demand.

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Hello , TroyK , I can use this vi work normally but I found some word I don't understan like.. "DLC"

[TroyK]

http://en.wikipedia.org/wiki/CAN_bus

DLC = Data Length Code. Number of bytes of data (0–8 bytes)

[HOYO]

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TroyK 已寫：

http://en.wikipedia.org/wiki/CAN_bus

DLC = Data Length Code. Number of bytes of data (0–8 bytes)

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Thank you,, Your answer is really helpful

[HOYO]

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TroyK 已寫：

http://en.wikipedia.org/wiki/CAN_bus

DLC = Data Length Code. Number of bytes of data (0–8 bytes)

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So , I guess the relationship is like as below right?

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DLC       DATA

0000      0byte

0001      1byte

0010      2bytes

0011      3bytes

0100      4bytes

0101      5bytes

0110      6bytes

0111      7bytes

1000      8bytes

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I have another question, Can "DLC=000" possibly?

[TroyK]

Yes, DLC is 4 bits.

Standard CAN DLC 0-8, value = number of bytes.

b0000  d0  0bytes (Yes, you can have zero bytes for wake-up for example)

b0001  d1  1byte

b0010  d2  2bytes

b0011  d3  3bytes

b0100  d4  4bytes

b0101  d5  5bytes

b0110  d6  6bytes

b0111  d7  7bytes

b1000  d8  8bytes

In CAN-FD number of bytes above 8 is encoded:

b1001  d9   12bytes

b1010  d10  16bytes

b1011  d11  20bytes

b1100  d12  24bytes

b1101  d13  32bytes

b1110  d14  48bytes

b1111  d15  64bytes

[HOYO]

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TroyK 已寫：

Yes, DLC is 4 bits.

Standard CAN DLC 0-8, value = number of bytes.

b0000  d0  0bytes (Yes, you can have zero bytes for wake-up for example)

b0001  d1  1byte

b0010  d2  2bytes

b0011  d3  3bytes

b0100  d4  4bytes

b0101  d5  5bytes

b0110  d6  6bytes

b0111  d7  7bytes

b1000  d8  8bytes

In CAN-FD number of bytes above 8 is encoded:

b1001  d9   12bytes

b1010  d10  16bytes

b1011  d11  20bytes

b1100  d12  24bytes

b1101  d13  32bytes

b1110  d14  48bytes

b1111  d15  64bytes

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I have this question is from "Data field"

I can not understand why 0..64 ,, Is not 0..63(8byte)?

[TroyK]

DLC is a 4bit field used to specify how many bytes of data are contained in the CAN frame.

4 bits can have a value of 0-15.

For DLC values 0 to 8 the number of bytes is equal to the DLC value.

For DLC values 9 to 15 the number of bytes is determined by the table I listed before.

A standard CAN frame can have 0-8 bytes.

A CAN-FD frame can have 0-64 bytes. (BYTES! not BITS)

CAN-FD is new, prehaps I shouldn't have mentioned it.  A network will be either CAN-FD or CAN but not both.  You can't mix them on the same bus.

[HOYO]

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TroyK 已寫：

DLC is a 4bit field used to specify how many bytes of data are contained in the CAN frame.

4 bits can have a value of 0-15.

For DLC values 0 to 8 the number of bytes is equal to the DLC value.

For DLC values 9 to 15 the number of bytes is determined by the table I listed before.

A standard CAN frame can have 0-8 bytes.

A CAN-FD frame can have 0-64 bytes. (BYTES! not BITS)

CAN-FD is new, prehaps I shouldn't have mentioned it.  A network will be either CAN-FD or CAN but not both.  You can't mix them on the same bus.

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Thanks your explain,,,I think I just confused the index and length!

[TroyK]

Update to my statement for accuracy accounting for emerging technology:

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@TroyK wrote:

A network will be either CAN-FD or CAN but not both.  You can't mix them on the same bus.

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Actually you can mix CAN and CAN-FD if all the older CAN nodes are put to sleep in a partial networking scheme or the tranceivers they use are specially designed to filter out CAN-FD frames.