> For the complete documentation index, see [llms.txt](https://docs.influxtechnology.com/support_guides/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.influxtechnology.com/support_guides/rebel-series/rebel-series/rebel-lt-and-ct-user-documentation/the-rebel-lt-data-logger/the-obd-and-inst-connector.md).

# The OBD & INST Connector

The OBD & INST connector is a Male 25-pin Standard D-Type connector.

<figure><img src="https://888960721-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FenX58y5hTu5O8sufLoOA%2Fuploads%2FTu6cOl7jyMsLp8XvnrYk%2Fimage.png?alt=media&amp;token=1c99777f-b191-4779-aa7f-45d63318e787" alt="" width="296"><figcaption></figcaption></figure>

<table data-header-hidden><thead><tr><th width="120"></th><th></th></tr></thead><tbody><tr><td><strong>Pin No</strong></td><td><strong>Pin Function</strong></td></tr><tr><td>Pin 1</td><td>Analog Input 3 - do not apply voltages outside of the -10 to +10V range</td></tr><tr><td>Pin 2</td><td>Ethernet LAN Receive -</td></tr><tr><td>Pin 3</td><td>Ethernet LAN Transmit -</td></tr><tr><td>Pin 4</td><td>Analog Input 1 - do not apply voltages outside of the -10 to +10V range</td></tr><tr><td>Pin 5</td><td>Wake-Up pin to wake logger from sleep mode (for use, see <a href="/support_guides/rebel-series/rebel-series/appendix-1.md"><mark style="color:blue;">Appendix 1</mark></a>)</td></tr><tr><td>Pin 6</td><td>CAN Bus 1 (Medium Speed Bus) Low Signal</td></tr><tr><td>Pin 7</td><td>CAN Bus 0 (High-Speed Bus) Low Signal</td></tr><tr><td>Pin 8</td><td>K-Line (1 wire bus) of ISO 9141</td></tr><tr><td>Pin 9</td><td>4.5-36V Supply Voltage</td></tr><tr><td>Pin 10</td><td>+4.5V Instrumentation Supply Voltage, ensure that the current drawn is not more than 100mA</td></tr><tr><td>Pin 11</td><td><p>Digital Input or Output 2 - When used as input, do not apply voltages outside the 0 to +12V range; when used as an Output, ensure that the current draw is not more than 100mA. </p><p>More information on the use of this pin can be found in <a href="/support_guides/rebel-series/rebel-series/appendix-2.md"><mark style="color:blue;">Appendix 2</mark></a> and <a href="/support_guides/rebel-series/rebel-series/appendix-3.md"><mark style="color:blue;">3</mark></a></p></td></tr><tr><td>Pin 12</td><td><p>Digital Input or Output 0 - When used as an input, do not apply voltages outside the 0 to +12V range; when used as an Output, ensure that the current draw is not more than 100mA. </p><p>More information on the use of this pin can be found in <a href="/support_guides/rebel-series/rebel-series/appendix-2.md"><mark style="color:blue;">Appendix 2</mark></a> and <a href="/support_guides/rebel-series/rebel-series/appendix-3.md"><mark style="color:blue;">3</mark></a></p></td></tr><tr><td>Pin 14</td><td>Analog Input 2 - do not apply voltages outside the -10 to +10V range.</td></tr><tr><td>Pin 15</td><td>Ethernet LAN Transmit +</td></tr><tr><td>Pin 16</td><td>Ethernet LAN Receive +</td></tr><tr><td>Pin 17</td><td>Analog Input 0 - do not apply voltages outside of the -10 to +10V range</td></tr><tr><td>Pin 18</td><td>Analog Ground</td></tr><tr><td>Pin 19</td><td>CAN Bus 1 (Medium Speed Bus) High Signal</td></tr><tr><td>Pin 20</td><td>CAN Bus 0 (High-Speed Bus) High Signal</td></tr><tr><td>Pin 21</td><td>Ground</td></tr><tr><td>Pin 22</td><td>Power Ground</td></tr><tr><td>Pin 23</td><td>Digital Input or Output 3 (can also be used as a switched power supply +Vd). When used as an input, do not apply voltages outside of the 0 to +12V range.</td></tr><tr><td>Pin 24</td><td><p>Digital Input or Output 1 - When used as input, do not apply voltages outside the 0 to +12V range; when used as an Output, ensure that the current draw is not more than 100mA. </p><p>More information on the use of this pin can be found in <a href="/support_guides/rebel-series/rebel-series/appendix-2.md"><mark style="color:blue;">Appendix 2</mark></a> and <a href="/support_guides/rebel-series/rebel-series/appendix-3.md"><mark style="color:blue;">3</mark></a></p></td></tr></tbody></table>

{% hint style="warning" %}

#### WARNING:

* Don't short circuit or overload any Digital I/O, e.g. If using Digital Input or Output 3 to supply power to power a K-Box or Rebel Dash, do not connect more than 1 K-Box to this output and be careful that no short circuit occurs.
* Overloading (I > 400mA) of Pin 10 (+4.5V Instrumentation) will result in a drop in the output voltage.
* Each End of the CAN bus must be terminated with a 120ohm resistor across CAN H and CAN. The Logger has dip switches inside that may be turned on if it is at the End of a CAN bus to allow the bus to be terminated easily.
  {% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://docs.influxtechnology.com/support_guides/rebel-series/rebel-series/rebel-lt-and-ct-user-documentation/the-rebel-lt-data-logger/the-obd-and-inst-connector.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.