汽车诊断协议ISO14230

KWP2000 ISO14230协议格式

一 四种格式





1，头和地址信息没有额外的字节长度



2，头和地址信息没有额外的字节长度



3，没有头地址信息，有额外的字节长度



4，有头地址信息，也有额外的字节长度

二 格式用途

Fmt Format byte

格式字节

SId Service Identification Byte

服务识别ID

Tgt Target address (optional) Data (depending on service)

目标地址

Src Source address (optional) CS Checksum byte

源地址

Len additional length byte (optional)

长度

三 时间计算

P1 Inter byte time for ECU response

P2 Time between tester request and ECU response or two ECU responses

P3 Time between end of ECU responses and start of new tester request

P4 Inter byte time for tester request

Users shall take note of limits listed below and the following restrictions:

P3min > P4min

Pimin < Pimax for i = 1, ..., 4

There may be further restrictions, when the tester and listening ECUs detect the end of a message by timeout. Inthis case the following restrictions are valid:

P2min > P4max

P2min > P1max