> For the complete documentation index, see [llms.txt](https://docs.axsun.com/axsun-knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.axsun.com/axsun-knowledge-base/how-tos/using-the-interface-board.md).

# Using the Interface Board

The Interface Board (AXS83695) converts the differential Sweep Trigger, Digital K-Clock, and OCT Balanced Receiver outputs from SATA connectors into corresponding single-ended signals on SMA connectors for viewing on an oscilloscope. The Interface Board is also known as OCT Bulkhead PCB. 

![Perspective View of the Interface Board](/files/-LRDZeNrjqm_myQpBVm9)

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### Making Connections

![](/files/-LYTfUfItMV9n0d_F7BG)

Below is a list of connections:

* SATA cable 1 connects J1 on the Interface Board to J2 on the balanced receiver board (top board) for Channel 1 & Channel 2 OCT Balanced Receiver signals.
* SATA cable 2 connects J2 on the Interface Board to J2 on the laser board (bottom board) for Sweep Trigger and Digital K-Clock signals.

{% hint style="danger" %}
**WARNING:**  All electrical signal connections and disconnections must be made with the Engine and Interface Board in a powered-off state.
{% endhint %}

* P3 on DC power-Y cable connects to J4 *or* J5 on the Interface Board (either will work).
* P1 *or* P2 on DC power-Y cable connects to J3 on the laser engine (either will work).

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### Output Signals

![](/files/-LdPdAymnTqncdJ5svyR)

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### Mounting

The interface board can be mounted using the SMA connectors. 

Make sure to place round Nylon spacers (¼ inch inner diameter) between the board and the mounting plate. 

Use the gold plated lock and nut supplied on each SMA connector. 

![Mounting interface board example](/files/-Laa9QLNHERJVT-1l5XH)