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User Manual
FE-URT-1 RS485 Servo Bus Programmer and USB to TTL Serial Signal Converter - SMS and SCS Series Servo Dual-Interface Programmer with Half-Duplex Hardware Auto-Direction for Feetech Serial Servos
The FE-URT-1 is a multifunction USB-to-serial signal converter and servo bus programmer designed specifically for configuring, debugging, and controlling Feetech SMS series RS485 smart servos and SCS series TTL single-bus servos from a host PC or MCU UART interface. Integrating a full-speed USB 2.0 serial chip with a linear low-voltage differential regulator circuit, the URT-1 converts USB signal to either 5V or 3.3V UART serial levels and routes the signal into two independent servo interface channels - channel A, an asynchronous half-duplex RS485 level port for SMS series servos using a 5264-4AW connector, and channel B, an asynchronous half-duplex TTL single-bus port for SCS series servos using a 5264-3AW connector - allowing both SMS and SCS servo types to be connected and controlled through a single serial port without reconfiguration or interface swapping between servo family types.
The hardware automatic direction control circuit on both the RS485 and TTL channels manages transmit-receive switching in the half-duplex communication protocol entirely in hardware without requiring an additional enable IO pin from the host MCU or explicit direction control commands in the host firmware, substantially reducing MCU port usage and firmware complexity in embedded servo control builds where manual direction pin management across multiple half-duplex interfaces would consume meaningful firmware and IO resources. The fool-proof servo connector interface uses 5264-4AW and 5264-3AW polarised connectors on the respective servo ports to prevent incorrect servo cable insertion that could damage the servo or programmer. The UART breakout header uses standard 2.54mm pin spacing for direct MCU UART connection, allowing the URT-1 to function as either a USB-to-serial PC interface for servo configuration through Feetech's PC software or as a UART-to-servo-bus bridge for MCU-controlled servo operation in embedded robotic and automation builds. Power LED, TX LED, and RX LED indicators provide real-time visual data flow monitoring without requiring a serial terminal or oscilloscope connection during development and debugging sessions. The 5V 500mA overcurrent and overvoltage protected USB power supply rail powers the URT-1 signal conversion circuitry, with the servo power port accepting external high-voltage supply stepped down via the onboard SMS-to-SCS section regulator for single-supply system builds, subject to the 6A maximum overcurrent limit that requires additional external power distribution for systems with more than a few servos connected simultaneously.
Key Features
- Dual Servo Interface: Channel A RS485 half-duplex port for SMS series servos via 5264-4AW connector and channel B TTL single-bus half-duplex port for SCS series servos via 5264-3AW connector
- Single Serial Port Control: Both SMS and SCS series servo families are controlled through a single serial port without interface reconfiguration or cable swapping
- Hardware Auto-Direction Control: Automatic transmit-receive direction switching in hardware on both channels without additional MCU enable IO or firmware direction control commands
- USB 2.0 Full Speed: Full-speed USB 2.0 device interface for host PC connection with Microsoft digital signature authentication across Windows XP through Windows 10 and Server editions
- Signal Level Switching: 5V and 3.3V UART serial port signal levels freely switchable for compatibility with 5V and 3.3V MCU UART interfaces
- Baud Rate Range: 50bps to 1Mbps supported baud rate range covering all Feetech SMS and SCS series servo communication rates
- Fool-Proof Servo Connectors: 5264-4AW and 5264-3AW polarised servo connectors prevent incorrect servo cable insertion for reliable servo connection without damage risk
- General UART Header: 2.54mm standard pin-pitch UART breakout header for USB-to-serial PC output or MCU UART-to-servo-bus bridge operation in embedded builds
- Power Status LED: D1 power indicator LED for visual supply status confirmation
- TX and RX Indicator LEDs: D2 TX and D3 RX data flow indicator LEDs for real-time serial data activity monitoring without oscilloscope or terminal connection
- USB Power Protection: 5V 500mA overcurrent and overvoltage protection on the USB power supply rail for host PC and USB hub port protection
- 6A Maximum Power Port: Servo power port with 6A maximum overcurrent limit requiring additional external power distribution for multi-servo serial bus builds
- Windows OS Compatibility: Supports 32-bit and 64-bit Windows XP, Vista, 7, 8, 8.1, 10, Server 2003, 2008, 2012, 2016 with Microsoft digital signature authentication
- Mini USB Interface: Mini USB port for host PC connection using a standard Mini USB cable
- Signal Conversion Only: URT-1 performs signal conversion only - servo power must be supplied externally for servo operation
Applications
- Feetech SMS series RS485 smart servo configuration, parameter programming, and real-time position and speed control from a host PC via USB connection
- Feetech SCS series TTL single-bus servo configuration, calibration, and control from a host PC or embedded MCU UART interface
- Embedded MCU UART-to-servo-bus bridge builds connecting STM32, ESP32, Arduino, Raspberry Pi, and RP2040 UART ports to Feetech SMS and SCS serial servo buses without additional direction control hardware
- Robotic arm, hexapod, and multi-servo platform development builds requiring simultaneous SMS RS485 and SCS TTL servo access through a single USB programmer interface
- Servo bus debugging and development sessions requiring TX and RX LED data flow monitoring and baud rate flexibility across the 50bps to 1Mbps range
- Windows-based servo configuration software integration requiring a digitally signed USB-to-serial converter with full-speed USB 2.0 and broad Windows version compatibility
Hardware Connection
Motherboard Port
Dimensions
