CAN _ Multiplexing Worksheet

1. I used twist paired from the ABS modulator.
The wires which are twisted every 20-30 mm to prevent capacitance , reduce EMF noise and the radio interference. The resistance , capacitance , length and resistance must remain the same or the signal will be different.
CAN type C Capable of high speed 226KBS-1MBS is used for important ECUs such as the ABS ECU,.
Power train controls and Emission controls. Not fault tolerant, should be 60 ohms Two 120 ohms resistance in parallel.
CAN type B is the slower more fault tolerant type is used for less important electric such as door lock and comport devices such as heater/air con. as long as one wire of the two wire has potential voltage difference from ground , bus should be able to operate.
CAN me be operate in one wire mode with voltage at 1.2 V.

I worked in 2003 Land Rover

1.3 Record the waveform of one of the wires :

Colour of Wire: Brown & Yellow
Time per division: 10 us
Voltage per division; 2V

1.4 Record the waveform of the other wire in the twisted pair

Colour of wire: Black / Yellow
Time per division: 10 us
Voltage per division: 1V

1.5 What is aliasing? Describe it.

Aliasing an effect where is the original signal can become undeniable. Also a distorted or noisy signal.

1.6 How do you know these waveforms are not aliasing?

These waveforms are not aliasing , because they are read able and we used the correct time division

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.1.7 , 1.8 & 1.9 tuitions

The voltage an the main line of 1.3 v was 2.63V. When it was talking voltage become 2.3V. This is the high speed line.
The voltage on main line is 1.4V was 0.25V, when it was talking voltage become 0.18V.This is the low speed line.
One module talk t the other module.
1.9 Observe the signal in 1.3 and 1.4 above with a voltmeter. Compare it with DC volts or AC volts setting.
Which setting would tell you if the signal is switching . Explain.
The comprising between DC v and AC v tells the signal of switching which is illustrating "on" or "off".
Yellow/Brown DC v = 2.3v and AC v= 0.23
Yellow/Black DC v = 0.26-0.318 v and AC v = 0.005
According to the observation we found by using the voltmeter it does not tells the good reading compared to the scan tool.