RS485 Single-turn Absolute Rotary Encoder


Key Features:

Power-off memory, no battery required

High precision: 32768PPR

Small size: 25mm~50mm outer diameter

  • 6mm Solid shaft
  • 8mm blind hole
  • 8mm solid shaft
  • 4mm solid shaft
15bit (32768P/R)
  • 10bit (1024P/R)
  • 12bit (4096P/R)
  • 14bit (16384P/R)
  • 15bit (32768P/R)
  • DC5V
  • DC24V

Single-turn Absolute Encoders

TCP RS485 (Modbus RTU), RS232 CAN SSI
Model No. BTR25-R0M BRT38-R0M BRT50-R0M BRT38-R0M BRT38-C0M BRT50-C0M BRT38-C0M BRT38-S0M BRT50-S0M BRT38-S0M
Shaft Type Solid Shaft Solid Shaft Solid Shaft Blind Hole Solid Shaft Solid Shaft Blind Hole Solid Shaft Solid Shaft Blind Hole
Shaft Diameter 4mm 6mm  8mm  8mm  6mm  8mm  8mm  6mm  8mm  8mm 
Body Diameter 25mm 38mm  50mm  38mm  38mm  50mm  38mm  38mm  50mm  38mm 
Protection Grade IP54 IP54, IP67 IP54 IP54, IP67 IP54 IP54, IP67 IP54
Resolution 1024P/R(10bit),4096P/R(12bit), 16384P/R(14bit), 32768P/R(15bit)  1024P/R(10bit),4096P/R(12bit) 
Working Voltage DC5V, DC24V (9~30V) DC5V

New Feature: If the power always keeps on, the single-turn encoder can be used as an electronic multi-turn encoder (but this function does not have the power-off memory feature), the total turns can be counted up to one million turns or more. Now that it has the measuring speed function, which is easy for users to calculate. When it is used as a single turn absolute encoder, any position within the measuring range is unique, even if there is interference or movement after power break, the position information will not be lost.

Mechanical Drawing

With All these Types of mounting shafts, the Absolute encoder is suitable for almost any application.

4mm Solid Shaft

6mm Solid Shaft

8mm Solid Shaft

8mm Blind Hollow

Electrical Characteristics

Electrical Parameters

Mechanical parameters

Environment Parameters

Wiring Connection

wiring connection of an absolute rotary encoder

Communicate Protocol

RS485 (Modbus RTU)

Red wire

Power Supply

Black wire


Yellow wire


Green wire


White wire


  1. Please pay attention to the voltage value (5V, 24V) on the encoder label before power on. Make sure to supply power accordingly.
  2. Set zero position: connect yellow wire to ground (black wire) more than 100mS.
  3. Please do not connect the yellow wire to anywhere during working except when it is needs to be set zero position.
  4. Restore the factory setting function: after power off, connect the yellow wire to ground (the black wire). Powered on again, it can be reset after 2 minutes, and separate the two wires after reset.

Software Interface

We provide RS485 host computer software, which is convenient for you to test directly on the PC.

For details, please refer to the file “How to use Briterencoder Software” on the download page.

Briterencoder Model Description

RS485 Single-turn Absolute Rotary Encoder User Manual