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# 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="/files/27Otb6Gv0E6lISKSOC3p" alt=""><figcaption></figcaption></figure>


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