MOTO GUZZI V100 E5 2023 Service Station Manual page 153

V100 E5
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Communication speed: messages travel at a speed of 250 kbps (data arrive at nodes every
20 ms, i.e. 50 times/second).
CAN PROTOCOL (CONT. NETWORK AREA)
The communication protocol is CSMA/CD (Carrier Sense Multiple Access w/ Collision Detection).
In order to transmit, every nod must first check that the BUS (the connection among all devices) is free
before attempting to send a message with BUS (Carrier Sense).
If during this period there is no activity on BUS, every nod has the same chance to send a message
(Multiple Access). If two nodes start transmitting simultaneously, the nodes recognise the "colli-
sion" (Collision Detection) and initiate an exchange action based on message priority (messages remain
unaltered during exchange and there is no delay for high priority messages).
CAN protocol is based on messages and not on addresses. The message itself is divided into several
parts (frames), each of which has a meaning: message priority, data contained, error detection, recep-
tion confirmation, etc.
Every network nod receives all the messages sent through the BUS (with reception confirmation or error
messages) and each nod decides if the message is to be processed or rejected. Besides, every nod
can request information from the other nodes (RTR = Remote Transmit Request).
Level in electrical circuit diagram
•
CAN Line
Electrical specifications
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All the control units connected: Electri-
cal resistance value, when measured
between pins 1 and 2 of the OBD port
= 60 ± 6 Ohm
•
Only instrument cluster disconnected:
Electrical resistance value, when
measured between pins 1 and 2 of the
OBD port = 120 ± 12 Ohm
•
Only 11MP control unit disconnected:
Electrical resistance value, when
measured between pins 1 and 2 of the
OBD port = 120 ± 12 Ohm
Electrical system
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