> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wuji.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Electrical and Network Integration

This page covers power, network setup, power sequencing, and connection recovery for Wuji Hand 2.2.

The device runs on nominal 12 V DC power and an Ethernet link with a static IP, with fixed conventions for power sequencing, addressing several devices, and recovering from a lost connection.

## Power Supply

| Item | Value |
| - | - |
| Input voltage | 11–13 V DC (12 V nominal) |
| Power requirement | Rated 200 W or more, the included adapter is 12 V 20 A |
| Power connector | XT30, with a male-to-female extension cable included (14 AWG, 2 m) |
| Communication interface | RJ45, 100BASE-TX |

> [!WARNING]
>
> Never reverse-connect. Never plug or unplug the power or communication cables while the hand runs. The product has over-voltage and over-current protection, but don't rely on protection tripping as part of normal operation.

> [!WARNING]
>
> The external interface form and the supply voltage range will change in later versions (no longer the XT30 + RJ45 two-cable direct layout). Leave room in your integration design.

> [!NOTE]
>
> The electrical data below isn't available yet and will be added later: the XT30 pin polarity diagram, operating / peak / standby power, and recommendations for inrush current, power protection, fusing, and grounding.

## Power-Up and Power-Down Sequence

* **Power up**: connect the XT30 at the device end first, then plug in the adapter. Connect once the status light goes from blue breathing (self-check) to white breathing (ready)
* **Power down**: stop motion, call `disable()`, confirm the device is at rest, disconnect power, then unplug the cables
* **Hot swap**: neither the communication cable nor the power cable supports hot swapping. After an accidental disconnect, follow [Timeouts, Disconnection, and Reconnection](#timeouts-disconnection-and-reconnection) below

## Network Configuration

The device uses a static IP and doesn't support DHCP. Factory default addresses:

| Item | Left hand | Right hand |
| - | - | - |
| IP | 192.168.1.110 | 192.168.1.111 |
| Gateway | 192.168.1.1 | 192.168.1.1 |
| Subnet mask | 255.255.255.0 | 255.255.255.0 |
| Port | 50001 | 50001 |

Set your computer's network adapter to a static IP on the same subnet (such as `192.168.1.50`). For the full round-trip of changing a device IP (write to flash, reboot to apply, reconnect at the new address), see [SDK Reference](https://docs.wuji.tech/docs/en/wuji-hand/latest/sdk-reference/device-operations.md#ip-set/get).

## Multiple Devices and Clients

* When several hands share a subnet, connect by serial number (`sn`) or handedness (`handedness`). With multiple devices of the same handedness on the network, use `sn`, otherwise the call raises `AmbiguousHandedness`
* Multiple clients at once (a visualization tool, a recording script, and your application all connected) is the default behavior (`enable_bridge=True`). To switch to exclusive single-client mode, see [Device Connection in the Wuji SDK](https://docs.wuji.tech/docs/en/wuji-sdk/latest/device-connection.md)

## Timeouts, Disconnection, and Reconnection

* Connection parameters: `ConnectOptions(timeout_ms=1000, retry_count=3)`
* **Communication loss while enabled**: the device stops the motors and reports a fault. It doesn't resume motion on its own once communication returns—call `enable()` again (firmware v2.1.0 and later)

To recover the connection:

1. Check both ends of the network cable and the network equipment, and confirm that the link to the host has recovered.
2. Subscribe to `joint_diagnostics`, read the active error codes, decode them with `WujiHand2.describe_error(code)`, and remove the reported causes.
3. Call `enable()` again and confirm that the status light turns solid white.


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