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OBD history - az OBD története
| ELM320 - OBD (PWM) to RS232 Interpreter | 
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| The ELM320 allows you to talk to your 41.6KHz J1850 PWM OBD (On Board Diagnostics) equipped vehicle through a standard RS232 serial connection, using only simple ASCII commands. This updated version remains just as easy to use, but is now completely programmable, allowing even more control, and of course possibilities. As before, the user need only issue the desired commands - the data formatting, error checking, bus arbitration, etc. is all handled by the ELM320. If you presently use one of our v1.x ICs, you will be pleased to know that this version is pin-compatible with the old (the only difference at power-up is that linefeeds are now on by default). Simply unplug the old and plug in the new. This IC only supports the 41.6KHz J1850 PWM data format which is typically used in Ford Motor Company vehicles. If you have a different vehicle, please refer to our ELM322 and ELM323 products. |
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| ELM322 - OBD (VPW) to RS232 Interpreter |
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| Similar to the ELM320, and also completely revised, the ELM322 is for connecting to an OBDII equipped vehicle which uses the 10.4KHz J1850 VPW format. This standard is typically used in General Motors Corporation and some DaimlerChrysler vehicles. The user need only issue the desired commands through an RS232 serial connection and the data formatting, error checking, bus arbitration, etc. on the vehicle side is all taken care of by the ELM322. This allows experimenters to inexpensively create their own 'scan tool'. If you presently use one of our v1.x ICs, you will be pleased to know that this version is pin-compatible with the old, so you can simply replace your IC if you want to upgrade. |
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| ELM323 - OBD (ISO) to RS232 Interpreter |
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| The ELM323 completes our trio of OBDII ICs, allowing you to talk to your ISO 9141-2 or ISO 14230-4 standard OBDII equipped vehicle using an RS232 serial connection. It transparently converts between a 10.4KHz ISO data stream and standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM323 handles all of it for you. The present version of the ELM323 (v2.0) provides several programmable features that the previous versions did not offer. It now allows programmable header bytes, adjustable timeouts, the ability to report in the packed data mode, and offers a special monitoring mode as well. This is in addition to all of the capabilities that the v1.x ICs offered - the full seven byte command structure, two line (K and L) initiation, software selectable linefeeds and character echoing, and the visual feedback provided by the four LED outputs. If you currently use one of our v1.x ICs, you will be pleased to know that this version is pin-compatible with the old, so you can simply replace your present IC with one of these, and immediately begin enjoying these new features. |
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My design is use thos ELM chips, and built in a DB9 to DB25 adapter. This gives compact size and full functionality for the OBD2 adapter.
Some pictures:
| This is the layout plan | Simulated boards | Empty boards |
| Components placed | Box | Box inside |
