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Thread: OBD-II software and LPT1 port

  1. #1
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    OBD-II software and LPT1 port

    I have a 2000 Saturn SL1, which uses OBD-II. I got a program that will read the codes from my car to my laptop.
    I have a cable that connects to the car's OBD connector, but the other end that's supposed to plug into my computer is an LPT1 (printer) port.

    The only free OBD-II software that I've been able to find only seems to support COM1 ports, but not LPT1 ports.
    Can I just use an LPT1 to COM1 adapter to connect it to my computer? Or do I need to go out and buy myself another cable?

    Thanks.

  2. #2
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    Most software out there is made for ELM compatible devices, which are serial based not parallel port based. Perhaps provide a link to the hardware you purchased?
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    Could it be a 25 pin serial connector? does it say RS232 on it? if so you need a 25 to 9 pin adapter. The instructions (or the website) should give more details about this.

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    Quote Originally Posted by malcom2073 View Post
    Perhaps provide a link to the hardware you purchased?
    The hardware I bought is http://www.canobd2.com/Products/Tool...27d26dcff5f3ea
    Unfortunately though, it cannot input live data from the sensors.

    Quote Originally Posted by dp19 View Post
    Could it be a 25 pin serial connector? does it say RS232 on it? if so you need a 25 to 9 pin adapter. The instructions (or the website) should give more details about this.
    It is a 25 pin connector, but it says "MPR# 05-4220" on it.

  5. #5
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    You can't use that cable from that code reader. It was designed specifically for that unit and won't work with your software or your laptop to do what you want to do.

    You will need to purchase an ELM compatible interface to work with the OBD software on you laptop. They come in either a serial (9 pin) or a USB version. You can Google ELM 327 to find a compatible device for your setup.

  6. #6
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    If you mean the top connector of the handheld device I donīt believe that you can connect that into a computer. This is probably some interface which only compatible with this particular device.

  7. #7
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    Quote Originally Posted by huidaman View Post
    The hardware I bought is http://www.canobd2.com/Products/Tool...27d26dcff5f3ea
    Unfortunately though, it cannot input live data from the sensors.
    It is a 25 pin connector, but it says "MPR# 05-4220" on it.
    Looking at the picture in the link there are a number of things which suggest to me that the cable will not interface into your computer
    1. There is a separate USB cable in the background
    2. The description states Custom PC Software is available for reports and update tool
    3. The display is battery powered for off-vehicle review

    OBDII is not a communications network which can connect directly to a computer without some kind of interface/protocol converter. Without the display device I would say the cable is useless and will not do anything for you.
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