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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ELM327P датащи(PDF) 29 Page - ELM Electronics |
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ELM327P датащи(HTML) 29 Page - ELM Electronics |
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29 / 51 page  29 of 51 ELM327 ELM327DSC Elm Electronics – Circuits for the Hobbyist www.elmelectronics.com Setting the Headers (Cont’d) AT SH command that uses only three hex digits. It actually operates by simply adding the leading zeroes for you. The 11 bit CAN standard typically makes functional requests (ID/header = 7DF), but receives physical replies (7En). With headers turned on, it is a simple matter to learn the address of the module that is replying, then use that information to make physical requests if desired. For example, if the headers are on, and you send 01 00, you might see: >01 00 7E8 06 41 00 BE 3F B8 13 00 The 7E8 shows that ECU#1 was the one responding. In order to talk directly to that ECU, all you need do is to set the header to the appropriate value (it is 7E0 to talk to the 7E8 device – see ISO 15765-4 for more information). From that point on, you can ‘talk’ directly to the ECU using its physical address, as shown here: >AT SH 7E0 OK >01 05 7E8 03 41 05 46 00 00 00 00 Hopefully this has helped to get you started. As we often tell those that write – if you are planning to do some serious experimenting with OBD, you should buy the relevant standards. |
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