> For the complete documentation index, see [llms.txt](https://inacks.gitbook.io/kappa4310ard-wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://inacks.gitbook.io/kappa4310ard-wiki/rj45-connectors.md).

# RJ45 Connectors

Typical Modbus Serial Line connectors include Screw Terminals, RJ45, and D-Sub 9-pin (commonly known as DB9), among others. The device-side connector must be female, while the cable-side connector must be male.

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When selecting a RJ45 cable, ensure it has shield and make sure to connect the cable shield to the connector shield to ensure proper electrical continuity across all cable shields on the bus.

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Do not connect the shield to the Common. All cable shields should be connected to Common and Protective Ground at a single point for the entire bus, ideally at the master device.

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Optionally, power can be supplied to your system through the pin 7 of the RJ45 connector.

<figure><img src="https://3607916421-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FypwscE0cn6vt2mset4dR%2Fuploads%2FuhAUMGtDuMRWNibe7mLf%2Fimage.png?alt=media&amp;token=d794d0b3-5972-4746-82c4-e008dd0e0faf" alt=""><figcaption></figcaption></figure>