# The OBD & INST Connector

The OBD & INST Connector is a Male 25-pin Standard D Type Connector with nuts.

<div align="left"><figure><img src="https://1222752003-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FdOw3hdDe6gabAGiQZT7A%2Fuploads%2Fj2NfffqjqKKNxHUv8mJL%2Fimage.png?alt=media&#x26;token=7d171630-d623-4907-bf22-288502fa4d10" alt="" width="296"><figcaption><p>Male 25-pin Standard D Type Connector</p></figcaption></figure></div>

<table data-header-hidden><thead><tr><th width="118"></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 voltage outside of the -10 to +10 V range</td></tr><tr><td>Pin 2</td><td>LIN 1</td></tr><tr><td>Pin 3</td><td>CAN / CAN FD Bus 3 Low signal</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 Appendix 1)</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>NC</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 - Do not apply voltages outside of the 0 to +12V range when used as an input. When used as an Output, ensure that the current drawn is not more than 100mA.</p><p>More information on the use of this pin can be found in Appendix 2 and 3</p></td></tr><tr><td>Pin 12</td><td><p>Digital Input or Output 0 - Do not apply voltages outside the 0 to +12V range when used as an input. When used as an Output, ensure that the current drawn is not more than 100mA.</p><p>More information on the use of this pin can be found in Appendix 2 and 3</p></td></tr><tr><td>Pin 13</td><td>CAN /CAN FD Bus 2 (Instrumentation Bus) Low Signal</td></tr><tr><td>Pin 14</td><td>Analog Input 2 - - do not apply voltages outside of the -10 to +10V range</td></tr><tr><td>Pin 15</td><td>LIN 0</td></tr><tr><td>Pin 16</td><td>CAN / CAN FD Bus 3 High signal</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 - e.g. to be connected to pin 5 of the OBDII Connector</td></tr><tr><td>Pin 22</td><td>Power Ground - e.g. to be connected to pin 4 of the OBDII Connector</td></tr><tr><td>Pin 23</td><td>Digital Input or Output 3 (can also be used as a switched power supply +Vd). Do not apply voltages outside of the 0 to +12V range when used as an input.</td></tr><tr><td>Pin 24</td><td><p>Digital Input or Output 1 - Do not apply voltages outside of the 0 to +12V range when used as an input. When used as an Output, ensure that the current drawn is not more than 100mA.</p><p>More information on the use of this pin can be found in Appendix 2 and 3</p></td></tr><tr><td>Pin 25</td><td>CAN / CAN FD Bus 2 (Instrumentation Bus) High Signal</td></tr></tbody></table>

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#### <mark style="color:red;">WARNING</mark>

DON'T SHORT CIRCUIT OR OVERLOAD AND DIGITAL I/O, e.g. IF USING DIGITAL INPUT OUTPUT 3 TO SUPPLY POWER TO POWER A K-BOX OR A REBEL DASH, DO NOT CONNECT MORE THAT 1 K-BOX TO THIS OUTPUT AND BE CAREFUL THAT NO SHORT CIRCUIT OCCURS.
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#### <mark style="color:red;">**WARNING**</mark>

OVERLOADING (I > 100mA) OF PIN 10 (+4.5V Instrumentation) WILL RESULT IN A DROP IN THE OUTPUT VOLTAGE.
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#### <mark style="color:red;">WARNING</mark>

EACH END OF THE CAN BUS MUST BE TERMINATED WITH A 120 OHM RESISTOR ACROSS CAN H AND CAN L. 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.
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