Multiplex Engineering is a technology company specializing in the serial databus standards being used in the automotive industry. We design and manufacture diagnostic interface hardware needed to build OBDII scan tools. We have shipped over 200,000 diagnostic interfaces since 1996. We do not sell any software to go with the interfaces. Any interface that you buy directly from Multiplex Engineering will not work with any existing commercial software you purchase from any source. It is necessary that you have, or write, your own.
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The Multiplex Engineering Interface allows for communications between a personal or handheld computer and an OBD2 compliant vehicle. We have interfaces that communicate over the legacy buses (VPW, PWM and ISO) and CAN. The basic operation of our device is to take a message from the user, forward it to the vehicle, receive the responses from the vehicle and forward them back to the user.
The Request Message is a message sent from a personal computer to the Multiplex Engineering interface that is 15 bytes long. The request message either instructs the interface to send a message to the vehicle with the data included, or it requests information from the interface itself. The message sent to the vehicle or information requested from the interface depends on the Command sent in the message. The destination address can be different for different interfaces. Specific destination addresses are assigned to different customers.
Almost all cars using CAN use SID addressing, however some cars do use EID addressing. The ISO-15765-4 specification Table 5 requires the functionally addressed EID messages to have an EID address of 18DB33F1. The ISO-15765-4 specification Table 5 requires the CAN response message to have a EID address of 18DAF1xx To set the Multiplex Engineering interface to report this EID address for responses you need to configure the mask and filter. After you are done with the EID operation you will want to set the Multiplex Engineering interface back to SID mode.
Do the connector blocks that you see provide stress relief for the wires that come out of the OBD2pins?. How do I order? You may order by FAX, phone, or e-mail. Pre-payments are required from individuals, purchase orders from companies. For California companies, please FAX or mail a copy of your re-sale license with your purchase order.
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