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Glossary |
Sampling point | Determines as a network parameter the point in time when the bit is sampled. |
Address mode | The address mode for a message can be "Standard" or "Extended". |
ASAP | The ASAP interfaces have been agreed by the "Study Group for the Standardization of Application Systems (ASAP)". Members of this study group are the German automobile manufacturers and companies in the supplier industry. |
Basic CAN | CAN Chip; possesses only one sender and one reception memory. |
Baud rate | Speed of the network. |
Operating mode | Transmission parameter for a message that describes for instance, whether remote operation is present or not. |
Bit stuffing | A technique that is used for resynchronization in bit-oriented network protocols. A change in the flank is caused by the inclusion of an additional complementary bit according to a defined number of bits of the same level. The additional bit is removed again by the receiver. |
BRT | Abbreviation for baud rate prescaler, defined as the number of BTL cycles. |
BTL cycles | Abbreviation for Bit Timing Logic cycle; a sampling frame is formed via the baud rate prescaler from the oscillator frequency of the chip. This auxiliary cycle (BTL cycle) serves to determine the time segments for the bit timing. |
Byte order | Network parameter that defines the sequence for the higher-value and the lower-value byte within a word. Since the processor manufacturers "Intel" and "Motorola" have made contrary definitions for the byte order, the values "Intel", "Motorola forwards" and "Motorola backwards" are possible for this parameter. |
CAN | Abbreviation for Controller Area Network |
CAN High Speed | Network link and network medium according to
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CAN Low Speed | Network link and network medium according to
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CAN conformance 2.0A | CAN with an identifier length of 11 bits (standard). |
CAN conformance 2.0B | CAN with an identifier length of 29 bits (Extended). All CAN controllers that can process CAN 2.0B telegrams are also capable of processing standard frame, i.e. to both send as well as to receive. |
CAN conformance 2.0B passive | CAN controllers that only process standard frames and that are passive in their response to CAN version 2.0B. These ignore extended telegrams according to version 2.0B. |
CANdb | CAN data base from Vector Informatik |
CRC | Abbreviation for Cyclic Redundancy Check; included the error code over all previous positions. The CRC checksum is used for fault detection yet not for fault corrections. |
CSMA/CD | Abbreviation for Carrier Sense Multiple Access with Collision Detect |
DLC | Abbreviation for Data Length Code; gives the length of the message in bytes. |
Readiness to receive following power-up | Transmission parameter for a message that describes the point in time following power-up, as of when the message can be received. |
Error value | Value for a signal if a fault is detected and the actual information can no longer be transmitted. |
Full CAN | CAN chip that, unlike the basic CAN, includes several sending and receiving storage devices. |
Initialization value | Value of a signal before the first reception in the receiver. |
Node | A network node that includes any participant or branch of the network. |
Latency time | Transmission parameter for a message that describes the transmission time in the network. The latency time is the time by which the the sending process for a message can be delayed by messages having a higher priority. In technical terms, the latency time is the period of time between setting the TransmitRequestBit and receiving the AckMessage. The maximum latency time for this message can thus be specified in the message. |
Multiplex-signal group | Several signal groups can be grouped together in a multiplex-signal group that can be identified by a respective (group) value. A receiver of the message can filter out the signal group intended for the receiver from this value. |
Network EMC design | Description of the designs or set-up of the network with regard to electromagnetic compatibility. |
net-signal group | <net-signal-group>s contain those signals having exactly the same characteristics. |
net-signal class | The net-signal class classifies the net-signals according to application signals and network management signals. |
OSEK | To be defined |
Phase relation to other messages | Transmission parameter for a message that describes whether there is a phase relation with other messages present. |
Physical range | Permissible range for the physical (external) values for a signal that are given on account of the conversion from the network-internal presentation. |
Quartz frequency | The frequency of the quartz or quartz oscillator connected to the CAN controller. |
RTR | Abbreviation for Remote Transmission Request; a flag for identification of a data request. A sender is requested to transmit a corresponding data telegram as the response. |
Transmission conditions | Transmission parameter for a message that describes the transmission conditions. |
Readiness to transmit following power-up | Transmission parameter for a message that describes the point in time following power-up as of which the message can be sent. |
SJW | Abbreviation for Synchronization Jump Width that is given in BTL cycles. Defines the maximum amount by which the CAN controller may extend or shorten both major segments of the bit time. |
Sleep/wake-up mechanism | A mechanism that puts the network into a "dormant state" with low power consumption (sleep) and re-activates this as required (wake-up); e.g. for a central-locking system. |
SLIO | Abbreviation for Serial Linked I/O. |
Memory layout | For a message, the memory layout is a (graphical) supplement to the description of signal lists and multiplex-signal groups that describes the signal distribution of a message in the memory. |
Conversion | Procedure, on how to convert the network-internal presentation (internal values) of a signal in the corresponding physical values (external values). |
Prescaler | Or baud-rate prescaler; for generation of the BTL-cycle frequency from the quartz frequency. |
Cycle time | (Also cycle tolerance time), transmission parameter for a message that describes the tolerance time for a message for a cyclic control system (cycle sending of the message). |
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