Sps adapter serial interface

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The SPS gives the user the ability to switch between performance modes and a stock performance setting via the vehicle OBD port. Our SPS has a preset stock mode, the ability to store three performance settings and the additional benefit of a security lockout program anti-theft. Simply select a program, plug in, wait a few seconds, remove the select device and start the car. It's simple and there's no fixed switch to install in the vehicle. The SPS delivers different levels of functionality depending on the vehicle it is used with, and whether variable switching is available in our performance software.

Revo adjustability allows the vehicle to be set up efficiently for varying fuel quality and conditions. Simply purchase whichever version fits the serial ports and wire them up according to the following tables:. Another method of resolving the various problems involved in interfacing the many situations typically encountered was advanced by David Yost around Yost deduced that with a crossover cable and several inexpensive adapters it is possible to create a system where any serial device can be conveniently connected to any other serial device regardless of the type.

This scheme consists of an adapter for DTE devices which is wired straight through, a standard cable wired as a crossover, and an adapter for DCE devices which is wired as a crossover as well. Thus, when a DTE device is connected to another DTE device, the cable provides the necessary conductor crossover, but when connected to a DCE device which is also a crossover device, the combination of two crossovers equals the same result as a straight cable needed for this type of connection.

In addition, where a DCE device is connected to another DCE device, the crossover in one adapter cancels out the crossover of the other adapter leaving only the single crossover of the cable, thus creating a perfect tail circuit cable. Specific benefits are that all connection points are standardized with the same signals appearing at the same place and a common male RJ connector. Taken together, any device can be simply connected to any other. The following table describes the configuration of the common cable used for all connections:.

That's all there is to it.. Mouse takes some current from each of the RSC port output lines it is connected about 10mA. Mouse send data to computer in levels that RSC receiver chip in the computer can understand as RSC input levels.

Because the typical opto-mechanical mouse also needs power for four LEDs in the opto-coupler movement detectors, there is not much power to loose. A typical approach is to use diodes to take current from DTR and RTS lines and then feed it through resistor to all of the infrared leds in the movement detectors. The serial data transimitting circuit consists of simple discrete transistor circuir to make it consume as little power as possible.

The positive power supply usually taken from RTS and DRT lines just after the diodes and before the resistor going to leds. The negative supply for transmitter is taken from TD pin. Typical PC serial port mouse takes 10 mA total current and operates at voltage range of V. Typically that cheap tho button mouse which comes with the computer is Microsoft mouse system. Microsoft mouse is supported in all major operating systems. This means that you can move CPI mouse up to speed of The actual accuracy of movement the software sees is detemined by the settings of the mouse driver many mouse drivers have option to adjust mouse sensitivity.

The negative pulse width is at least ms. After a cold boot, the RTS line is usually set to a negative level. Serial data parameters: bps, 7 databits, 1 stop-bit Data packet format: Data packet is 3 byte packet. It is also possible to use 8 databits and 1 stop bit format for receiving. In this case X gets value 1. The safest thing to get everything working is to use 7 databits and 1 stopbit when receiving mouse information and if you are making mouse then send out 7 databits and 2 stop bits.

The byte marked with 1. The bit D6 in the first byte is used for syncronizing the software to mouse packets if it goes out of sync. Logitech extension to protocol Logitech uses this same protocol in their mice for example Logitech Pilot mouse and others. The original protocol supports only two buttons, but logitech as added third button to some of their mouse models. To make this possible logitech has made one extension to the protocol. Apparently, the information of the third button state is sent using one extra byte which is send after the normal packet when needed.

Value 32 dec is sent every time when the center button is pressed down. It is also sent every time with the data packet when center button is kept down and the mouse data packet is sent for other reasons.

When center button is released, the mouse sends the normal data packet followed by data bythe which has value 0 dec. The extra data byte is sent only when the center button is operated.