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# LSS-HUB Board

Last modified by Eric Nantel on 2025/03/19 14:08
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Table of Contents

- Description
- Features
- Specifications
- CAD Files
- Pinout
- Wiring
  - Single Power Hub
  - Multiple Power Hubs
- Dimensions & Mounting

# Description

The LSS Power Hub provides a simple solution to supply power to and communicate with the smart servos. It is also a useful tool to split the LSS bus from one servo to two or three while allowing these servos to be powered separately. The Power Hub can be mounted directly to the servos.

# Features

- 4x LSS connectors of which three can be powered separately by removing the onboard Vin jumper.
- 2.1mm x 5.5mm center positive female barrel jack
- 2.54mm spaced Tx, Rx, Vin and GND pins broken out to allow control of the LSS motors using an external UART serial device
- LSS motor mounting

# Specifications

- 3A (amps) maximum current per LSS connector
- Dimensions: 1" x 1.25" (with mounting tabs), 1" x 1" (without mounting tabs)

# CAD Files

- LSS-HUB.zip

# Pinout

|  |  | Vin / Separate Vin: With the Vin jumper in place, all servos connected to the hub are powered via the same source (blue and red power lines become connected). With the Vin jumper removed, the connector marked with an asterisk * is decoupled from the other three servos (blue and red no longer share Vin), allowing them to be powered separately from the barrel connector or other source.
| Vin: With the jumper in place, all servos connected to the power hub are powered via the same source. Refer to the Voltage section of the LSS - Specifications page to understand which voltages are meant to be connected to this pin.
| Ground (G): This pin should be connected to both the communication source's ground, as well as that of the power source (principle of "common ground"). When the Vin jumper is removed, ground is kept common.
| Servo Rx pin (Rx): In serial mode, this pin should be connected to the Tx pin of a TTL serial device.
| Servo Tx pin (Tx): In serial mode, this pin should be connected to the Rx pin of a TTL serial device.

# Wiring

| ## Single Power Hub A single Power Hub mounted on the servo (12 possible mounting positions on a servo) shows how a servo can be powered with a power supply (a wall adapter for example) through a 2.1mm x 5.5mm center positive plug. Note: Cable colors are intended to show functionality (actual cables are all black).
| ## Multiple Power Hubs Two Power Hubs in use: first which is mounted to the servo on the right is used to power that servo. Second hub which is mounted to the servo on the left allows two additional servos to be on the same bus but use a separate power source. Note that the Vin jumpers are removed on both hubs. Note: Cable colors are intended to show functionality (actual cables are all black).

# Dimensions & Mounting

Tags: LSS power adapter interface splitting harness electronics dimensions
Created by Eric Nantel on 2019/03/21 11:22
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