Re: [opendiag] Re: header bytes - What are HM0 and HM1?

John,

Sorry, that's all what I know at the moment.
I'm searching for more info.

radix

Page, John schrieb:

>Radix,
>
>Thanks very much for this information. Does this mean that HM0, having no
>address information, is used for broadcast? And for HM1, is $68/$48 the only
>valid use of the HM1 header mode?
>
>John
>
>-----Original Message-----
>From: radix [mailto:juglandis@...]
>Sent: 06 November 2003 17:28
>To: opendiag@yahoogroups.com
>Subject: Re: [opendiag] Re: header bytes - What are HM0 and HM1?
>
>
>Header byte HN0 = Format byte
>-----------------------------------
>bit 0 to bit 5 define the length of the message
>a message length of 1 to 63 bytes is possible
>if bit 0 to bit 5 = 0 then additional length byte is included
>
>and now bit 6 and bit 7
>b7/b6
>00 = no address information
>01 = exception mode CARB uses format byte $68 and $48 see ISO9141-2 /
>SAE J1979
>10 = with address mode info physical address $80
>11 = with address mode info functional address $C0
>
>radix
>
>Sander schrieb:
>
>
>
>>What I have seen in Bosch motronics is:
>>HM0 - Header without address information
>>
>>This is after communication start with a physical address.
>>
>>I don't know if this is also possible for the case when started with
>>functional addressing.
>>
>>Sander.
>>
>>--- In opendiag@yahoogroups.com, "Page, John" <John.page@e...> wrote:
>>
>>
>>
>>
>>>Does anyone have the full definition of the Header Modes HM0 and
>>>
>>>
>>>
>>>
>>HM1 in the
>>
>>
>>
>>
>>>Format Byte of KW2000 messages? The KW2000 spec defines HM2 and
>>>
>>>
>>>
>>>
>>HM3, but not
>>
>>
>>
>>
>>>HM0 and HM1. I am assuming that this is defined somewhere else -
>>>
>>>
>>>
>>>
>>perhaps a
>>
>>
>>
>>
>>>pre-existing standard - so that KW2000 messages can be compatible
>>>
>>>
>>>
>>>
>>with other
>>
>>
>>
>>
>>>standards (ISO 9141?).
>>>
>>>Thanks,
>>>John
>>>
>>>
>>>
>>>
>>>>10 - HM2 - Header with address information, physical target
>>>>
>>>>
>>>>
>>>>
>>address
>>
>>
>>
>>
>>>>11 - HM3 - Header with address information, functional target
>>>>
>>>>
>>>>
>>>>
>>address
>>
>>
>>
>>
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>>
>>
>>
>>
>>
>>
>
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Received on Sat Nov 08 08:08:56 2003