当前位置:网站首页>[UDS unified diagnostic service] i. overview of diagnosis (4) - basic concepts and terms
[UDS unified diagnostic service] i. overview of diagnosis (4) - basic concepts and terms
2022-04-23 06:39:00 【Tomorrow is like noon】
One 、 Diagnostic overview (4)— Basic concepts and terms
1. Client and server
client (Client)
The originator of the diagnostic request –Tester( Diagnostic instrument 、 Upper computer ), Send a diagnostic request
Server side (Server)
Provider of diagnostic response – Some ECU, Send diagnostic response
Remote client / The server (Remote Client /Server)
And Server (Client) Not in the same “ Network segment ”
2. Data transmission related
Protocol data unit (PDU)【Protocal Data Unit】
Protocol data unit is a set of information and data , It represents the information and data transmitted between the sender and the receiver peer entities .
The protocol data unit includes :
- Protocol control information (PCI)【Protocal Control Informaiton】
- data (Data)
Single frame transmission
Data length <6/7 Bytes
Message type :
- A single frame (SF)【Single Frame】
Multi frame transmission
Data length >6/7 Bytes , Most allow 4095 Bytes
Message type :
- First frame (FF)【First Frame】: Describe the beginning of the transmission
- Flow control frame (FC)【Flow Control】: During transmission , Message flow control port
- Consecutive frames (CF)【Consecutive Frame】: To transmit data
3. Communication related
Physical communication (1:1)
Scenario of physical addressing communication , And one-to-one diagnostic communication between client and server .
Functional communication (1:N)
The scenario of communication using functional addressing , And the communication mode in which the client sends diagnostic requests of the same function to multiple servers .
source address (SA)【SourceAddress】
Sending node address
Destination address (TA)【TargetAddress】
Receiving node address
4. Structure of automobile diagnosis system
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