MR340-1 OEM Controller

MR340-1 OEM Controller

OEM Controller for MR340 Series Incremental Encoders
The MR340-0 PCB Controller enables Original Equipment Manufacturers (OEMs) to compactly and cost effectively integrate MR34X series Fber Optic Incremental Encoders within their own equipment designs.

In operation, the MR340-0 Controller sends two optical wavelength signals to a remote MR34X series Sensor. The encoder then modulates each optical beam based on the direction with a leading or lagging phase shift. The return optical signals are split into two separate beams and converted back into electrical signals by two photo diodes whose outputs are amplified by two gain-controlled amplifiers. A microprocessor supervises the amplitude of the optical signals and constantly adjusts the signal to provide a stable quadrature output.

The system has built-in diagnostics and can signal any anomaly occurring during sensor operation.


Electrical Interface
Connector 16-pin ribbon cable receptacle, 3M N2516-5002-RB

Recommended mating plug, 3M 89116-0103

Quadrature Outputs A+/A-/B+/B- RS422 line driver outputs, 100 kHz maximum bandwidth
Discrete Signals ZERO Input, STATUS out, 5V logic
Serial Interface Modbus RTU or RS422/485 compatible, User settable baudrate: 9,600 to 115,200

Byte format: 1 Start Bit, 8 Data Bits, 1 Stop Bit, No Parity

Power Supply +5 VDC, 55mA typical, 100mA maximum

Recommend 100mA power supply

Optical Interface
Connector LC Duplex
Fiber Type Duplex 62.5/125μm, Graded Index Fiber, 0.275 NA, Type OM-1
System Loss Budget 10dB
Maximum Distance Up to 1600 meters (5250 ft) with MR34X series Sensor
Environmental Attributes
Temperature/Humidity -5°C to +55°C (23°F to +131°F), 0-95% RH, Non-Condensing
Ingress Protection IP30, keep free from contaminants
Physical Attributes
Dimensions 98.9 x 50.8 x 12.7 mm (3.5 x 2.0 x 0.50 inches)

plus ≈61.0 mm (2.40 inch) connector clearance

Mounting 4x #2-56 or M2.5 screws, mounting pattern 3.10 x 1.60 inches
Weight 25g (0.9 oz)

Specifications subject to change without notice


  • Medical
  • MRI
  • Robotics
  • Industrial


  • Compact PCB form factor for ease of OEM system integration
  • Supports all MR34X series rotary and linear sensors
  • Operates from 5 VDC
  • A/A’/B/B’ RS422 line driver quadrature outputs
  • Modbus RTU/RS485/RS422 compatible serial interface
  • RS232 or USB intefacing available with optional converter
  • Feature rich Modbus communications protocol
  • LC Duplex multimode optical link operates up to 1600 meters

Ordering Information

MR340-0 OEM Controller
MR340-1 DIN Rail Mount Controller

Quick Ship Configurations

MR340-0 OEM PCB Controller
MR340-1 DIN Rail Mount Controller
MR341-E03C1R5 Size 11 Rotary Encoder, 512ppr, Duplex LC Pigtail Length=1.5m
MR342-D06D00 Size 58mm Encoder, 360ppr, IP-LC Interface
MR343-B400C05 MRI Linear Sensor, Duplex LC Pigtail Length=5m
MR344-F38C1R5 Hollow Shaft Encoder, Through Hole, IP54, 1024ppr, Pigtail Length=1.5m
MR344-F38PC1R5 Hollow Shaft Encoder, Pocket Hole, IP66, 1024ppr, Pigtail Length=1.5m
MR345-F12D00 Shaft Encoder, 1024ppr, IP-LC interface
MR346-D12D00 Size 90mm Encoder, IP66, 360ppr, IP-LC InterfacePOF Sensor Cable, 5m
MR348-D06C05 MRI Safe Size 58mm Encoder, 360ppr, Duplex LC Pigtail Length=5m