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HET Third Year SSEA SAIT > 190302dB > Flashcards

190302dB Flashcards

Off-Road Electrical Circuit Fundamentals- Part B

1
Q

What is multiplexing?

A

ability to send and receive digital electronic signals over a pair of wires at high speed

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2
Q

benefits of using a data link?

A

minimizes amount of electrical wiring, reduces size and cost of wiring harnesses + components. can add components easily

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3
Q

what 3 multiplex networks and protocols does off-road equipment use?

A

J1587/J1708, J1939/CAN, ISO11783/CAN

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4
Q

Is there a master control device in a CAN network?

A

No

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5
Q

What is the device that’s designed to follow the CAN protocol?

A

a transceiver chip

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6
Q

How is priority determined in a message?

A

priority code is embedded in

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7
Q

Purpose of data links?

A

connect systems and communicate info form one module to another

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8
Q

What does ISO stand for?

A

international organization for standardization

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9
Q

What does ISO do?

A

implements international proprietary, industrial and commercial standards

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10
Q

What does SAE do?

A

set industry standards for electronic control systems and diagnostics

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11
Q

What is a baud rate?

A

speed of data transfer over the network. In kb/s or Mb/s

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12
Q

What is a backbone?

A

network method of connection. most common is twisted pair with shielded connection

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13
Q

What is a stub?

A

segment of data link. max 1 meter in length (like a road off the main highway)

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14
Q

What is a node?

A

a computer or device that has a unique network address ( a house)

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15
Q

What is a terminating resistor?

A

placed at each end of the data link. reduces electrical interference ( a cul-de-sac at the end of the road)

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16
Q

What are standing waves?

A

electrical reflections or waves, causes problems with module communication

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17
Q

What is a Vehicle communication data bus?

A

communication network that connects to all the multiplexed components of the system

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18
Q

What is a protocol?

A

common language for data communication between modules.

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19
Q

What is Controller Area Network?

A

communication protocol for on-highway trucks

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20
Q

What are data links?

A

Provide transmission of input and output signals between nodes and diagnostic scan tools

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21
Q

What does a non-shielded twisted pair cable contain?

A

a twisted pair of wires protected by a plastic coating

22
Q

What does a shielded twisted pair cable contain?

A

non-insulated copper wire (drain). wires are wrapped in tin foil and uses plastic coating for insulation

23
Q

What is the drain wire used for?

A

prevents interference from entering data link

24
Q

Why are conductors twisted?

A
  1. provide immunity to magnetic fields
  2. enables conductors to maintain constant capacitance
25
Q

Twisted pairs have how many twists per foot?

A

12 per linear foot

26
Q

What is topology?

A

logic structure of control modules on data bus (a neighborhood)

27
Q

Characteristic of loop/ring topology?

A

all modules wired in series

28
Q

Disadvantage of loop topology?

A

if one module loses power/ground, all modules will lose communication

29
Q

characteristic of star topology?

A

contains a master module in the centre and slave modules

30
Q

Characteristic of linear topology?

A

has a backbone with stubs running to each module. there is no master module

31
Q

What are the disadvantages of SAE J1587/J1708?

A
  1. if one part of network fails, it will become non-functional
  2. slow communication speed
32
Q

What is a message identifier?

A

indicates source address of transmitting node

33
Q

What is a parameter identifier?

A

indicates to what parameter the following data correspondsa

34
Q

What is a parameter data byte?

A

Parameter identifier (PID) is followed by one data value.

35
Q

What is a checksum?

A

final byte of data

36
Q

What are the standards for cabling and connectors on J1587/J1708?

A

max bus length: 40m
Max # of nodes: 20
unshielded twisted pair
orange and white
does not need terminating resistors
has gold plated pins

37
Q

What kind of topology does SAE J1939/CAN use?

A

linear topology

38
Q

What design is used for J1939 cabling?

A

twisted pair of wires
Green and yellow
can be shielded or unshielded

39
Q

If one terminating resistor is missing, what will be seen?

A

communication glitches

40
Q

if both terminating resistors are missing, what will be seen?

A

all communication will fail

41
Q

in a j1939 system, what does a total loss of communication indicate?

A

a voltage or hardware problem

42
Q

in a j1939 system, what does a partial loss of communication indicate?

A

data bus device failure

43
Q

what colour wires are used in ISO11783?

A

green, blue, red, black

44
Q

How do the ISO11783 wires correlate?

A

red and black are used as a backbone (terminating bias circuit) and green and blue are used like J1939

45
Q

what is the purpose of ISOBUS standardizing the data bus breakaway connector?

A

so that any make of machine is compatible with any make of implement

46
Q

What replaces the PID in a J1939 message?

A

suspect parameter number (SPN)

47
Q

When performing the CAN data wire ground fault test, what is the expected reading of a properly functioning system?

A

1Mohm-4Mohm

48
Q

When performing the terminating resistor test on a J1939 data link, what does a reading of less than 60ohm indicate?

A

short

49
Q

What is the construction of an ISO11783 cable?

A

unshielded twisted quad

50
Q

2 functions of a terminating bias circuit?

A

uses battery power + ground supply along with can high and can low to provide electrical bias and termination to the network, preventing reflections from occurring in the system that would create interference

HET Third Year SSEA SAIT (11 decks)

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