Micronor MR380-0-UNI User manual

© Copyright 2023, MICRONOR SENSORS, INC.
Venture, CA, USA
MR380-0-UNI
Fiber Optic
Universal OEM Signaling Controller
Instruction Manual
DOC: 98-0380-32
Revision C dated 5/12/2023
MICRONOR SENSORS INC.
2085 Sperry Ave, Suite A-1
Ventura, CA 93003 USA
T [phone]
[e-mail]
www.MICRONOR.com
Notice of Proprietary Rights
The design concepts and engineering details embodied in this manual, which are the property of MICRONOR
SENSORS, are to be maintained in strict confidence; no element or detail of this manual is to be spuriously used, nor
disclosed, without the express written permission of MICRONOR SENSORS.All rights are reserved. No part of this
publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without prior written permission from MICRONOR SENSORS.

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Revision History
REV
Date
Notes
A
2/10/2016
Initial Release
B
8/1/2016
Update for New Terminal Plug
B1
10/20/2016
Added Explosive Atmosphere specification
B2
3/7/2017
Added Extended Temperature model MR380-0-1E
B3
9/27/2019
Added Updated MR380 Declaration of Conformity
C
5/12/2023
Update for MR380-0-UNI Universal Controller

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Table of Contents
1. Product Description .......................................................................................................... 4
1.1 Fiber Optic Switch Sensor Controller Board ............................................................... 4
1.2 Fiber Optic Controller Board ...................................................................................... 5
1.3 Functional Description ................................................................................................ 5
2. Initial Preparation .............................................................................................................. 8
2.1 Unpacking and Inspection .......................................................................................... 8
2.2 Damage in Shipment .................................................................................................. 8
2.3 Standard Contents...................................................................................................... 8
3. Installation and Operation................................................................................................. 9
3.1 Mounting the Sensor Unit........................................................................................... 9
3.2 Mounting the MR380-0 Controller PCB ...................................................................... 9
3.3 Optical Connections to the MR380-0 Controller....................................................... 10
3.4 Electrical Connections To MR380-0 Controller ......................................................... 11
4. Warranty Information....................................................................................................... 13
5. Specifications .................................................................................................................. 14
5.1 MR380-0-UNI Universal OEM Signaling Controller ................................................... 14
6. Reference Documents ..................................................................................................... 15
6.1 MR380-0 OEM Controller Reference Drawing .......................................................... 15
Figures
Figure 1. MR380 Fiber Optic Signaling Devices........................................................... 5
Figure 2. Block Diagram for a MR380-0 Controller System .......................................... 6
Figure 3. Keep LC Duplex connector ends protected when not in use ....................... 9
Figure 4. Dimensions of MR380-0 Controller PCB ...................................................... 9
Figure 5. Make optical connection using LC-Duplex optical connector ..................... 10
Figure 6. Layout of MR380-0 PCB.............................................................................. 11
Figure 7. External Relay Connection .......................................................................... 12

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1. Product Description
1.1 Fiber Optic Switch Sensor Controller Board
A fiber optic switch works on the basis of interrupting a light beam when a certain event occurs
and the switch is activated. Although switches take on various forms such as, Toggle, E-STOP,
Push-Button and so on, the principle of sensing the switch state remains the same via
interruption of the optical beam. MICRONOR has implemented the concept by using a transmit
fiber and a receive fiber. The transmitter sends a constant light level via the transmit fiber and
the receive fiber guides the light back. When the switch is not activated, most of the light is
guided back to the receiver. When the switch is activated, little or no light is coupled back to
the receiver.
The MICRONOR Fiber Optic switches are immune to EMI/RFI and can be deployed at great
distances from the electrical controller. Applications include:
•MRI machines operate under an extremely strong electromagnetic field. Special switches
are manufactured to be entirely free of metallic materials and, thus, will not interfere with
the MRI imaging process.
•Pipe and tube welding produces extreme interference while the welding process is
active
•Surgical robots must perform 100% reliably
•Oil & Gas since there is no sparking
•Aerospace actuators operating in and around other noise generating avionics
•Aerial Tramways, Gondolas, Skilifts etc, because immunity to lightening.
An all-optical, non-electronic passive solution, such as the fiber optic switch, provides complete
immunity to such interferences.

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1.2 Fiber Optic Controller Board
The MR380-0 Controller Board is intended for the OEM user in support of deployment of the
various Fiber Optic Signaling products. The OEM PCB contains a stabilized transmitter and a
sensitive optical receiver. There are two digital outputs
a.) 5V logic Level signals a High when optical power is received.
b.) Open-collect output for activating an external relay (or other electrical load) when
sufficieant optical power is received.
This universal PCB may be used in conjunction with many of the MICRONOR signaling devices.
The MR380-0-UNI is intended for OEM applications where the PCB can be mounted into a
suitable enclosure and where it is sufficiently protected from the environment such as water and
dust or similar influences. Optically the interface board is compatible with both single mode
OS1 and multimode OM1 (62.5µm/125µm) and OM2/OM3 (50µm/125µm) fiber cabling.
1.3 Functional Description
The “Universal” Controller
The MR380-0 OEM Controller is designed to be universally compatible with any standard fiber
optic cabling. This is accomplished through the design of its transmit and receive fibers.
In fiber optics, coupling two fibers of different core diameters is only permitted when the core
of the receiving fiber is the same size or larger than that of the transmitting fiber. For example,
transmitting from OS1 9/125µm single mode fiber to OM1 62.5/125µm or OM2 50/125
multimode fiber does not produce any losses since the core diameter expands from 9µm to
62.5µm or 50µm. Conversely, transmitting from OM1 or OM2 fiber to OS1 fiber causes
significant losses and is unacceptable as the core of the receiving fiber is smaller than that of
the transmitting fiber. However, if the receiving fiber is only slightly smaller than the
transmitting fiber, there is a smaller loss that can be built into the system loss budget. For
Figure 1. MR380 Fiber Optic Signaling Devices

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example, transmitting from OM1 fiber (62.5µm core) to OM2 fiber (50µm core) produces a
loss of approximately 1.2dB, which is not a problem in most situations.
In the MR380-0 controller, the transmit fiber is OS1 9/125µm single mode fiber. Since the core
of the fiber is smaller than any other standard fiber, no losses are produced at this connection,
no matter which standard fiber the rest of the system uses. And, at the other end, the
controller’s receive fiber is OM1 62.5/125µm multimode fiber. Similarly, no losses are
produced at the receive connection because the OM1 fiber is larger than any standard fiber
the rest of the system might use.
As a result, the MR380-0 controller is compatible with any standard fiber, hence its
designation as a universal controller. Despite this designation, users should use the same fiber
throughout their system to avoid complications and simplify future alterations.
Functional Block Diagram
A functional block diagram is shown in Figure 10, showing the switch sensor, optical link and
controller module. The switch is connected to the controller by a duplex fiber optic cable of
readily available 50/125µm or 62.5/125µm multimode fiber or 9/125µm single mode fiber.
The controller’s 9/125µm single mode transmit fiber guides steady optical power from a near-
IR light source to the optical switch. Then, a 62.5/125µm multimode receive fiber returns the
light relaying if the switch is open or closed.
Controller
Figure 2. Block Diagram for a MR380-0 Controller System
The light source power is held constant under normal operating conditions allowing for a
known system loss budget when designing a system. Additionally, the optics within the switch
are designed to couple maximum light back into the receive fiber enabling the ability to
create long distance systems and chain multiple switches.
Next, the optical power is identified by the photodetector and translated into a logic signal
depending on the power level. The photodetector operates with an active low signal scheme

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which provides a known failure state. The controller then interprets events such as broken
fiber, poor connection, high loss or a depressed switch as a failure or ‘EMERGENCY ON’.
The photodetector outputs a logic signal to the remaining logic circuitry which then interprets
high or low levels for the +5V digital and Open-Collector outputs.

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2. Initial Preparation
2.1 Unpacking and Inspection
The unit was carefully inspected mechanically and electrically before shipment. When received,
the shipping carton should contain the following items listed below. Account for and inspect
each item before the carton is discarded.
The PCB is an electronic Assembly and susceptible to ESD. Please use appropriate
grounding and caution when handling the PCB.
In the event of a damaged product, write or call your nearest MICRONOR AG sales office.
Please retain the shipping container in case re-shipment is required for any reason.
2.2 Damage in Shipment
If you receive a damaged product you should:
1) Report the damage to your shipper immediately.
2) Inform MICRONOR AG or your local Micronor representative.
3) Save all shipping cartons.
Failure to follow this procedure may affect your claim for compensation.
2.3 Standard Contents
MR380-0-UNI OEM Controller Board:
•PCB board with built-in Duplex LC interface and 3.5mm contact strip.
•CamdenBoss P/N CTB1301/6A
6C, Screw-Type Terminal Plug, 5mm Contact Spacing
This Instruction Manual can be downloaded from www.micronor.com

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3. Installation and Operation
3.1 Mounting the Sensor Unit
When installing the sensor, be careful not to bend the fiber excessively. It is recommended to
keep the minimum bend radius 25mm (1”) or larger. Ensure that the fiber outlet at the switch is
protected from excessive pulling or bending.
Figure 3. Keep LC Duplex connector ends protected when not in use
Make sure that the fiber optic connector tips are always covered when not in use. Always clean
and inspect the connector ends before mating to interface.
Be sure to use proper fiber optic cleaming tools and procedures such as the
MICRONOR MR321C Cleaning Kit. Improper tools and/or processes may damage or
contaminate the optical interface.
3.2 Mounting the MR380-0 Controller PCB
The controller PCB should be mounted on 4 standoffs.
Clearance shall be available for access to the Fiber Optic Interface.
The mounting holes are suitable for #2-56 or M2.5 screws.
The mounting holes are electrically connected to GND.
Consult Reference Drawing 98-0380-15 for more information
Figure 4. Dimensions of MR380-0 Controller PCB

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3.3 Optical Connections to the MR380-0 Controller
A duplex fiber optic cable is used to interconnect the sensor and controller. The sensor
incorporates a 1.5m optical pigtail (or as specified by customer). If a longer connection to the
controller is required, then a fiber optic extension cable may be used.
Remove the dust cap form both the cable connector and the optical port on the controller.
Insert the LC connector as shown. There should be a positive click when the connector is
engaged properly.
Do not force the Fiber Optic Connector!
Figure 5. Make optical connection using LC-Duplex optical connector