# RD001 serial cable

The RD001 serial cable is used to connect S2 node working as a PC node with a B2 server serial port. It is also used for programming S2 nodes, both to change their firmware and to set the radio network and node IDs as described in [s2-blu-programmer](https://help.boomerang3.com/s2-radio-system-manual/tools/s2-blu-programmer "mention") and [s2-init-node](https://help.boomerang3.com/s2-radio-system-manual/tools/s2-init-node "mention").

The cable is has an RJ11 plug on one side and DB9 female plug on the other.

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The connections are shown on the schematic below.

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