{"id":5074,"date":"2026-07-30T14:51:52","date_gmt":"2026-07-30T12:51:52","guid":{"rendered":"https:\/\/w3.ime-actia.de\/vehicle-diagnostics\/iso-tp\/"},"modified":"2026-08-11T14:25:49","modified_gmt":"2026-08-11T12:25:49","slug":"iso-tp","status":"publish","type":"page","link":"https:\/\/www.ime-actia.de\/en\/vehicle-diagnostics\/iso-tp\/","title":{"rendered":"ISO-TP"},"content":{"rendered":"\n
<\/i>Back to Vehicle Diagnostics<\/a><\/div><\/div><\/div><\/div><\/div>\n\n

ISO-TP – ISO 15765-2<\/h2>\n\n

Previous transport protocols had limitations when transferring large amounts of data, as can occur particularly during programming and flashing. For this reason, ISO 15765-2<\/strong> defined a new transport protocol (ISO-TP<\/strong> for short). The standard applies to various vehicle-specific bus systems such as the CAN bus<\/a>, FlexRay<\/a>, LIN<\/a>, and MOST<\/a>. <\/p>\n\n

The ISO-TP layer covers Layers 3 and 4 of the OSI model and can transport up to 4,095 bytes of payload data<\/strong> in a single telegram. To do this, the payload data is divided into individual telegrams and supplemented with control data that enables the recipient to interpret it. <\/p>\n\n

ISO-TP supports both addressing via the standard CAN identifier and addressing via extended addressing. With extended addressing, the first byte of a frame\u2019s payload is also used to transmit additional address information. This is necessary when not every control unit has its own CAN identifier. <\/p>\n\n

Every ISO-TP telegram always contains one byte for protocol information (PCI\u2014Protocol Control Information). This byte carries the frame type, a counter, and status information. <\/p>\n\n

PCI Identifier<\/th>Telegram Type<\/th><\/tr><\/thead>
0x0<\/td>Single Frame<\/td><\/tr>
0x1<\/td>First Frame<\/td><\/tr>
0x2<\/td>Consecutive Frame<\/td><\/tr>
0x3<\/td>Flow Control<\/td><\/tr><\/tbody><\/table>
PCI Frame Identifier<\/figcaption><\/figure>\n\n

<\/p>\n\n

Overview<\/h3>\n\n
    \n
  1. The transmission process is initiated by the transmitter with a first frame.<\/li>\n\n\n\n
  2. The receiver acknowledges the first frame using a flow control signal. With this flow control signal, the receiver also informs the transmitter of the maximum number of consecutive frames that may follow<\/strong> one another and the maximum time interval between them. <\/li>\n\n\n\n
  3. The transmitter then sends the permitted number of consecutive frames. The receiver also acknowledges this block with a flow control message. <\/li>\n\n\n\n
  4. This transmission of consecutive frame blocks is repeated until all data has been transmitted.<\/li>\n<\/ol>\n\n
    \"ISO-TP
    ISO-TP Sequence<\/em><\/figcaption><\/figure>\n\n
    <\/div>\n\n

    Structure of the Various Frame Types<\/h3>\n\n

    1. Single Frame<\/h4>\n\n

    If only 6 bytes (extended addressing) or 7 bytes (standard) need to be transmitted, no segmentation is required, and a single frame is sent.<\/p>\n\n

    \"ISO-TP
    Single Frame<\/em><\/figcaption><\/figure>\n\n

    Identifier: 0x0 – Identifier Single Frame<\/p>\n\n

    DL: Data Length (max. 6\/7 Bytes)<\/p>\n\n

    <\/p>\n\n

    2. First Frame<\/h4>\n\n

    A first frame is sent when there is more data to be transmitted than can be contained in a single frame. In this case, the first frame does not initially carry any payload data, but only the total length of the data to be transmitted. <\/p>\n\n

    \"ISO-TP
    First Frame<\/em><\/figcaption><\/figure>\n\n

    Identifier: 0x1 – Identifier First Frame<\/p>\n\n

    DL: Data Length (max. 4095 Bytes)<\/p>\n\n

    <\/p>\n\n

    3. Consecutive Frame<\/h4>\n\n

    After the first frame, all subsequent data is transmitted in consecutive frames. These frames also include a counter, which can be used to detect lost frames. <\/p>\n\n

    \"ISO-TP
    Consecutive Frame<\/em><\/figcaption><\/figure>\n\n

    Identifier: 0x2 – Identifier Consecutive Frame<\/p>\n\n

    SN: Sequence Number (0-15)<\/p>\n\n

    <\/p>\n\n

    4. Flow Control<\/h4>\n\n

    A flow control frame can be used to specify how the transmission should take place.<\/p>\n\n

    \"ISO-TP
    Flow Control<\/em><\/figcaption><\/figure>\n\n

    Identifier: 0x3 – Identifier Flow Control<\/p>\n\n

    FS: Flow Status (0 – Clear to send, 1 – Wait, 2 – Overflow)<\/p>\n\n

    BS: Block size of the maximum possible consecutive frames<\/p>\n\n

    ST: Minimum separation time between consecutive frames <\/p>\n\n

    <\/p>\n\n

    <\/span>
    \n
    \n
    \n
    \"ACTIA<\/figure>\n<\/div>\n\n\n\n
    \n

    Do you have any questions about our products or services?<\/h2>\n\n\n\n

    We are here for you! Send us your inquiry using the contact form \u2013 our team will get back to you as soon as possible. <\/strong><\/p>\n\n\n\n

    \n
    Contact us<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

    ISO-TP – ISO 15765-2 Previous transport protocols had limitations when transferring large amounts of data, as can occur particularly during […]<\/p>\n","protected":false},"author":1,"featured_media":5069,"parent":2227,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-5074","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/pages\/5074","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/comments?post=5074"}],"version-history":[{"count":3,"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/pages\/5074\/revisions"}],"predecessor-version":[{"id":5124,"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/pages\/5074\/revisions\/5124"}],"up":[{"embeddable":true,"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/pages\/2227"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/media\/5069"}],"wp:attachment":[{"href":"https:\/\/www.ime-actia.de\/en\/wp-json\/wp\/v2\/media?parent=5074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}