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Descripción: Can Bus Datos
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Sistema Multiplexado de comunicaciones. Teoria sobre el sistema CAN/VAN-Bus.
1
CAN bus properties
2
CAN networks on PGRT
3
CAN message
us i!le
us i!le
"tart of fra#e
Inter#ission
I!entifier Arbitration fiel!
Data fiel! En! of fra#e
Control fiel!
Ac&no'le!(e#ent Ac&no'le!(e#ent fiel!
C$C error c%ec& fiel!
)
Achieving the electrical bit
! e t t i # s n a r t e ( a t l o *
Ti#e
+
Signal properties of a CAN bus 12 ! $ecessi,e si(nal "C#
12 !
Do#inant si(nal
6
$isuali%e& with a Scope meter CAN. a,era(e ,olta(e
CAN lo'est pea& ,olta(e $ecessi,e si(nal le,el
CAN a,era(e ,olta(e CAN. %i(%est pea& ,olta(e
Do#inant si(nal le,el
"C# electronic principle
Power suppl(
*olta(e con,erter
Po'er #o!e lo(ic
CP#'mo&ule
Analo(ue inputs
Di(ital inputs
"ensors
Di(ital outputs
Actuators
Dri,ers
T r a n s c e i v e r
.i(% current actuators CAN bus
Transceiver components PNP
)nverter CAN Controller NPN
Comparator Resistor network
CAN bus
Transceiver function *
+
CAN Controller
CAN bus
10
Transceiver function +
1
CAN Controller
1
*
11
,essages t(pes- point to point
"C#
"C#
"C#
"C#
"C#
"C#
"C#
12
,essages t(pes- broa&cast
"C#
"C#
"C#
"C#
"C#
"C#
"C#
13
CAN bus without terminal resistors
"C#
"C#
"C#
"C#
"C#
"C#
"C#
1)
CAN bus with terminal resistors
"C#
"C#
"C#
T(pe of resistor mount it on the CAN connector block
T(pe of resistor' capacitor ass( mount it into an "C#
"C#
"C#
"C#
"C#
1+
Re&. Green an& /ellow bus connector blocks
Diagnostic connector 3)AGNST)CS 4S3P56
R"3 Red bus CAN #S
C Yellow /ello /ellow w bus CAN #S
Engine C management
",S
GR""N CAN #S Instrument cluster
)C0
$)S
Visibility
0owest possible specification APS
16
1
Termination resistors
1
Troubleshooting CAN buses
Scania multimeter 788 9: measure the integrit( of the CAN wires an& the CAN voltage levels
,easuring CAN bus resistance- able to trace wire w ire an& termination resistors faults; able to trace open circuits or short circuit to groun& or "C#
,easuring CAN bus voltage- able to trace "C#
CAN messages can not be checke& with a multimeter; instea& the &iagnose software is use& to check the s(stems functionalities=
