Dcc block detector DCC Diagnostic Tools On this page Sniffer vs. DCC Basics—What Are All These Wires For And Where Do They Go (329) How to Install DCC (NCE Powercab) on the Train Layout How to Use a Model Railroad DCC Block Occupancy Detector Model Railroad Academy 17. Visit SBS4DCC to review technical specifications and additional resources plus DCC tutorials tips and tricks for the Digitrax BDL716 LocoNet Block Occupancy Detector - 16 Detection Sections and many other great DCC products. 8A capacity suitable for all scales and track wiring configurations. We also offer professional DCC decoder installation and model train repair services. The detector is sensitive to the rapidly changing Possibly the cheapest way to add block occupancy detection to your DCC layout and integrate it with JMRI, it could save you hundreds! You may want to watch my first two videos on building the The Block Watcher is powered from the DCC input power and eliminates the need for an added external power supply. Transformers can only pass AC signals. We are aware that most will simply want to install it as is without additional complication, so this additional document summarises the basics of using BD20. Model: BD20. The The problem is it takes a lot of hardware to implement DCC signaing. I'm going to use this thread to gather the information that I research as I try to decide what system to use. "current" detector and they worked perfectly for my signalling operation, initially using Colour Lights but later upgraded to Semaphores. Digitrax BD4N DCC 4 Block Occupancy Detector Digitrax MSRP: $37. Yah I guess that makes sense if you're a Digitrax guy. WELL Dec 31, 2007 · So a DCC block detector (s) (NCE, Circuitron, etc. Oct 2, 2018 · I have a dcc layout wired in blocks and I want to run simple red/green signals but I don't want to get involved in expensive and complicated computerized block detection. I use the controls to light LEDs on the control panel, crossbucks and other lights, and signal tower block indicators on the tracks. The detector is sensitive to the rapidly changing currents Apr 12, 2020 · Hi, I'm doing this for the first time. These circuits recognize block occupancy by detecting current being drawn through the track by locomotives, cars with lights or rolling stock with resistor wheels. Jul 19, 2023 · 8-Channel DCC Track Circuit/Block Occupancy Detector (DTC8) Kit 56A This design detects the current flow through the track to give an indication of the section occupancy. Connects to AIU01 or most commercial signal systems. 8A capacity, suitable for all scales and track wiring configurations ATOM DCC Block Detector The Iowa Scaled Engineering ATOM is a reliable, easy-to-install, single-channel DCC block detector. Since it's DCC Specialties "Jack Wabbit Quad" Stationary Accessory Decoder - Snap Coil, High Voltage DCC Specialties MSRP: $89. On-board status leds for stand-alone occupancy and track power indication, expandable for optional LT5 or fascia mounted occupancy NCE Power for DCC - Bd-20 Block Detector For Dcc - 205 NCE Power for DCC SKU: TH-NCE-205 | UPC: 816757010632 Mar 14, 2024 · The BD4N provides 4 blocks. Because the Based on a current transformer, the detector maintains Digitrax Block Detector for DCC Block Occupancy Detection ~ (Replaces BDL168) ~ BDL716 $110. There are five types of sensors we will cover Digitrax BD4N DCC 4 Block Occupancy Detector All Scale Low-cost, High-sensitivity DCC block-occupancy detection. See full list on signalogicsystems. 01 to 20A BD20 by NCE: Scenery - Amazon. Two or three turns should be sufficient. 00 $84. Locomotives will naturally trigger the detector because they draw current through their DCC decoder. 00 Block Occupancy Detection Another reason for electrical blocks with DCC is to use them with detectors that can tell if the block is occupied. They were low cost, isolated output, hysteresis, high sensitivity, and minimal voltage drop. 24 Blocks? If you would like a complete sensor unit that requires no soldering you can get the NCE DB20 Block Detector for less than $15. These are about $10. Previously my DCC s Continuing on from the first video, "Wiring your track for Block Detection", we see some BD-20's wired and switching relays for a small "relay interlocking". I believe the NCE BD20 Block detector is similar. SUPER FAST SHIPPING. The Iowa Scaled Engineering ATOM is a reliable, easy-to-install, single-channel DCC block detector. Block Detector Rob Paisley designed a DCC block occupancy detector using a Vitec (TM) 57P1820G current sense transformer. Normally , these detectors are used Oct 16, 2025 · Go Back Please NCE-BD20-ManualFullscreen Mode Description Low-cost, High-sensitivity DCC block-occupancy detection. 2nd and additional items ship free! Optional Detection and Power status led connector for remote state indication, compatible with e. I'm getting close to finished with the benchwork and its time lay the track and order the electronics. Country/Region of Manufacture: United States. The other way is block detector modules that detect the train but do not report back to your control system. Through the first three parts of this series (links to part 1, part 2 and part 3) I’ve experimented with and refined to a degree the use of ACS712 current sensors for block occupancy detection. The output is optically isolated so the signaling system can be separate from the DCC signal and thus minimize the interference with operation of the signal circuits. DCC, being an alternating signal with a nominal 8kHz frequency, presents an interesting alternative – transformers! NCE DCC Mini Panel Automation ControllerUse one button to control multiple switches or macros on your NCE DCC system. If any of you have experience with block detection systems your contributions would be very much appreciated. g. Learn how to use a block occupancy detector in your model railroad dcc setup to indicate where current is flowing. The basic concepts for working with an ACS712 sensor board are discussed in Block Occupancy Detection for DC and DCC, Part 1, but lets review them here: –The ACS712 sensor senses current flow regardless of polarity up to its rated maximum (5, 20 or 30 amps). The cpOD is a low cost, DCC only, current sensing block occupancy detector for model railroads. Commercial block occupancy detection systems for DCC typically use current transformers to sense current draw from locomotives or resistor wheelsets. The Iowa Scaled Engineering Block Signal Basic is complete solution for adding basic ABS block signals at a track block boundary. Thanks! Aug 18, 2025 · Connect to a NCE AIU-01 for signal systems. Hence the B20x is designed for and limited to DCC applications. By monitoring the signal current, that change can be used to indicate the presence of the Engine motor or LED lights, and thus block occupancy. Some of these projects have resulted in MERG kits but nothing on these pages should be taken as definitive information about the kits, members should check the kit pages for up to date information on the kits. Each detector circuit senses whether electrical current is flowing into a section of track. Each detector circuit senses whether or not electrical current is flowing into a section ("block") of track. Characteristics: There were several characteristics I desired in a block occupancy detector. com FREE DELIVERY possible on eligible purchases Watch as modeler and DCC expert Steve Barkley explains how to wire your layout for controlling signals and block occupancy detection. The power district gap location is the point where the lower level double main line tracks meet with the DCCOD TRACK OCCUPANCY DETECTOR If your railroad uses DCC for train control, then the best detector to use is the DCC Optimized Detector, the DCCOD. 01 to 20 Amps BD20Detects DCC current being drawn in a block. The relay contact is used to activate a signal or accessory circuit. 6 days ago · NCE BD20 Block Detector 5240205 NEW. Time delay works great for consistent detection. One is a complete unit that detects a train and reports back to your control system. This board operates as a DCC occupancy detector for 8 blocks using remote CT coils. Connecting BD4 to an SE8C?The BD4 is a block occupancy detection device designed as an add-on device that can take advantage of the LocoNet hosting capability of the SE8c signal decoder. Fast shipping. Can be used to drive external relays Low-cost, High-sensitivity DCC block-occupancy detection. This detector has been designed to eliminate many of the installation problems associated with the installation of signal systems. There are also 4 general purpose I Dec 4, 2020 · I've decided to include block detection on my new layout. If current is flowing, the circuit closes a relay contact. Unpowered rolling stock will not trigger the detector unless Nov 16, 2025 · NCE Owners Manual: BD20 Block Detector If you have any questions or feedback regarding this advice, please feel free to contact us at salesuk@dccconcepts. A++ The seller's communication was excellent. Any opinions Signalogic Signals Circuitron Switch Machines Features: Low-cost, High-sensitivity DCC block-occupancy detection. You will need a module to send the output of the block detector to the computer. Simply run the track feeder wire through the The detector requires a +12 volt filtered DC isolated power supply one detector is required for each block. Sep 20, 2025 · NCE BD20 Block Detector 5240205 NEW. Assuming that one has also equipped some rolling stock with resistor wheel-sets, lighting or sound decoders, so that the entire length of a train is detectable, the theory is that current draw Dec 5, 2015 · DCC Block Detectors Discussion in ' DCC Control ' started by paul_l, Feb 17, 2016. Nov 16, 2021 · I'm looking for advice/confirmation that I have my blocks laid out correctly for block detection/automation. We will list some of the most helpful tools here including where to buy This is a Digitrax BD4N DCC 4-Block Occupancy Detector. To set it up just wrap the wire that provided power to the isolated end blocks through the hole in the coil. ATOM DCC Block Detector The Iowa Scaled Engineering ATOM is a reliable, easy-to-install, single-channel DCC block detector. Rather than just needing a booster or two and a handful of sound-equiped locomotives to get started, you will need a block detector circuit for every single block you will need to detect. Connects to AIU01 or Mini Panel. If my concept of building a layout around a network of Arduino boards and off-the-shelf peripherals is going to work, it has to be able to do block occupancy detection. I really don't want my signaling controlled by my turnouts so here's my idea: I wire in a spdt relay with the coil being Configured to operate with DCC booster power from; DCS52,u2028DCS100, DCS210, DCS210+, DCS240, DCS240+ Command Stations,u2028DB210 and DB220 boosters. Jun 8, 2016 · The whole purpose of doing block occupancy detection is to be able to control access so that no more than 1 train tries to occupy 1 block. Metal wheels work way WAY better than the plastic ones. 99 In stock (20 items available) NCE 0205 - BD20 Block Detector DCC 3 reviews Write a Review $17. ATOM Block Detector User Manual Overview The Iowa Scaled Engineering ATOM (CKT-BD1) is a reliable, easy-to-install, single-channel DCC block detector. The detector will handle up to 20 Amps of DCC current. DCC is a form of AC where DC is not. Just put a diode pair in the first uncontrolled block as if it had a detector. 36 SKU: NCE0205 UPC: 816757010632 Availability: All in-stock items ship within 1 business day Introducing our DCC BLOCK Current DetectorFOR MORE VIDEOS - VISIT OUR YOUTUBE CHANNEL: @ModelTrainTechnology Visit our website: https://modeltraintechnol A DCC Block Detector and Cutout (BDC1) This is a design for a combined sensitive block occupancy detector and overload cutout unit for DCC systems. I don’t plan on doing full-bore signal control and the like – just hooking up some LEDs to the control panel to let me know when a block is occupied. You can have up to 30 pushbuttons, toggle switches, block detectors, etc. Contribute to mwinters-stuff/DCC-Block-Detector development by creating an account on GitHub. Get it? BD4N / 4 blocks? As for the detection of longer trains in the block, ya may have to experiment with the resistance level on the wheels. Usable to 20 Amps of track current with no heating. 8A capacity, suitable for all scales and track wiring configurations. For those of us who aren't, well, there was the PR-1 through 4 Model Railroad Signal Systems has signal control systems and DCC auto reverse circuits for use with any scale of model railroading. Responded immediately to answer my questions and resolve my problems and suggested appropriate actions for their resolution. All plug-in connectors for simple and easy installation and service. com or via the enquiries form on our Contact Us page. &. I've decided to go with the current transformer type, similar to the NCE BD20. LT5C. Digitrax BD4N DCC 4 Block Occupancy Detector Low-cost, High-sensitivity DCC block-occupancy detection. Detects presence of train in block by the current it draws. LCC also supports 2-way traffic or it is bidirectional. The "Power-Lok" feature optionally monitors the DCC bus power. Nov 17, 2024 · Great block detector for DCC model railroads. It has a four terminal block at one end and the coil at the other. On-board status leds for stand-alone occupancy and track power indication, expandable for optional LT5 or fascia mounted occupancy indicator leds Model railroad train detection products to reliably detect trains for applications such as crossing signal activation, signals systems and staging. A power failure latches the . Optional Detection and Power status led connector for remote stateu2028indication, compatible with e. These work by detecting current: if something in the block is drawing power, it’s occupied. Visit SBS4DCC to review technical specifications and additional resources plus DCC tutorials tips and tricks for the Digitrax BD4N DCC 4 Block Occupancy Detector and many other great DCC products. The rail connected through the detector must be isolated at the track block boundary, which should be located right at the signals. 95 Price: $71. Legacy Models Intelligent Detection Detection on a layout is useful, but usually accompanied by complicated looking boxes, loads of wires and instructions that would test the most ardent technophile. Aug 16, 2005 · Has anyone here tried the Digitrax BD4 block detector yet? It’s not that expensive, and I’m considering it for some hidden track I’m about to lay. On-board status leds for stand-alone NCE #5240205 (BD-20) Block Detector for DCC, . Your trains will use the DCC bus while all the accessories such as block detectors, turnouts, signals and anything else can work on the LCC bus. In part 1, I take you through how I wire for block detection in DCC. It outputs logic levels, and has a RR-CirKits standard ribbon connector interface. Featuring occupancy detectors, block detectors, signal decoders, and controllers from top brands like Digitrax, ESU and NCE, our products ensure precise control and efficient operation for an immersive layout experience. Analyzer DCC Sniffer (PACKET analyzer) Logic Analyzer/Decoder DCC Track Phase Detector *Work in Progress. Feb 26, 2024 · These detectors are used with an Arduino micro, and enable signal controls, block detection, indicators, and can drive other boards. Block detectors sense the presence of a locomotive or other rolling stock on a section of track. 00 Low-cost High-sensitivity DCC block-occupancy detection. Detection circuits will output logic levels, and use the RR-CirKits standard ribbon connector interface. The "Power-Lok" feature optionally monitors Which sensor type to use? Infrared sensors Hall effect sensors Block occupancy detectors Proximity sensors Video Sensors A common topic that arises in support chats in Discord is which sensor type to use in various scenarios. The current may be for a locomotive, a lighted coach or any other rail vehicle with conductive axles. Block detection on this first module turned out to be somewhat challenging because of the large number of blocks—24— in a relatively small space. These devices are essential for accurate model railroad block detection, helping you monitor train locations and enhance operational realism. Adjustable sensativity. But one problem is that these can only detect a moving train at one point, whereas a current-based detector will detect even a parked train (on DCC layouts) anywhere in the block. com Improve train tracking and layout automation with a DCC block detector from Tony’s Trains. User defined as 16 DS reporting addresses in 1 to 2000+ DS range. ) would be used in place of what part of the Atlas signal system ? And how ,specifically, would you connect a block detector into the Atlas system ? I confess I am not an electrical engineer and do not understand exactly what the Atlas components need to do for the signals to work in DCC. I was browsing through some MR articles I threw onto PDF for my own personal reference and saw in the May 2000 Issue an article on DCC block detection by Bruce Chubb And want to know if there is a simpler easier way to Developed by DCC Specialties US Patent 7,810,435 The PSX series includes 4, DCC Power District Circuit Breakers that incorporate a solid state design, block detection and network feedback. It will not work on DC. Can split into two 8-DS areas to operate from two separate boosters. However, being the cheapskate that I am, and that I like to build things, I'd like to go with something cheaper or homemade. #205 BD-20 Block Detector. Can be connected for control of turnouts, signals, and other Visit SBS4DCC to review technical specifications and additional resources plus DCC tutorials tips and tricks for the RR-CirKits BOD-8-SM Block Occupancy Detector and many other great LCC products. 00. 99 Add to Cart MERG DCC System - Downloads Last updated 19th July 2023 This page is a resource area for projects members are working on or have completed and wished to make publicly available. Jun 14, 2020 · I installed a couple of infra red setups that were okay for sensing a train in a Siding but weren't suitable for sensing a train travelling in a "Block" of any length, so I installed an NCE BD20. On-board status leds for stand-alone occupancy and track power indication, expandable for optional LT5 or fascia mounted occupancy ind When an engine, or MTT lit passenger car or caboose, is on the section of track where the detector is, the amount current running through the wire changes. BDL716 Features: 16 DS sections, similar to BDL168, for DCC occupancy detection. Easy setup with device The first is when going from a detector controlled block into a non detector controlled section such as a yard or siding. Simple DCC Block Detector. Although designed for Free-mo modules, the FBM-2 can be used on any model railroad layout where block detection is required. You don't need this power if you don't use the LED option. The BDL716 is a cost effective LocoNet Occupancy Detector for 16 detection sections. Explore CTI's model railroad sensors for efficient and cost-effective train control solutions, enhancing your layout with advanced technology. The BD-20 block detector module is normally used to indicate the presence of a locomotive, caboose or other rolling stock in a track section by sensing electrical current drawn by that rolling stock. DCCconcepts Ltd How to use it, how to connect it and how to set it up for best results The NCE BD20 detector is simple and reliable device used in layouts of all sizes. It is particularly useful where high density or centrally located detection is desired. We are an authorized NCE dealer. Detects DCC current being drawn in a block. For home layout use, only one ATOM current-based block detector Model DBD What it is: The DBD has two current sensing block occupancy detection circuits that operate independently. It is also known as Occupancy Detection. An Intro to Block Detection at Chadwick Model Railway | 137. You can use DCCODs to indicate occupancy status of hidden trackage, to drive LEDs on your track What it is: The DBD2 has two current sensing block occupancy detection circuits that operate independently. Since it's Digitrax BD4N 4-Block DCC Block Occupancy DetectorDigitrax BD4N 4-Block DCC Block Occupancy Detector Low-cost, High-sensitivity DCC block-occupancy detection. Mar 6, 2016 · One of the first considerations was block detection, and I started considering what a better block detector might look like. . Jun 4, 2005 · Do any of you use block occupancy detection to drive your signals? Maybe you can suggest a system that will work with DCC. For example, knowing the occupancy status of each signaled block is essential to keep signals at red when the blocks ahead are occupied. MPN: 5240205. Occupancy detectors determine that something is within a block somewhere. Typically, these outputs are used to directly power signals. Infrared train detectors electronic control system to animate model railroad train signals and crossing gates. The computer needs to know train location if it is automatically to control train BlocD8 - High Density DCC Block Detector Discontinued The BlocD8 is an eight block occupancy detector for DCC. Compatible with a wide variety of other block detectors on the market, the ATOM provides two open collector outputs (one for detection, one for no detection) with optional pull-up resistors and easy pushbutton sensitivity adjustment. Configured to operate with DCC booster power from; DCS52,u2028DCS100, DCS210, DCS210+, DCS240, DCS240+ Command Stations,u2028DB210 and DB220 boosters. Simply run the track feeder wire through the TRACK OCCUPANCY DETECTION FUNDAMENTALS: Part 1 Paramount to most C/MRI applications is the need for the computer to be able to determine which sections of track are occupied. This design is a simple block occupancy detector for use on DCC systems only. Other desirable traits included simple power requirements, (no external supplies to cause sneak paths) adjustable sensitivity, and some sort of built-in monitoring for testing. This detector puts the power of a microprocessor to work analyzing the current feed to the rails. Lets you know when detection sections of your layout are occupied. It is fully compatible with the Modular Signal System (MSS) standards, and provides what the MSS standard calls a "cascade. 96 Iowa Scaled Engineering - ATOM DCC Block Detector SKU: ISE-CKT-BD1 ATOM DCC Block Detector 0 CA$25. This board operates as a DCC block occupancy detector for up to 8 blocks using remote CT coils for detection. Features: Integrated DCC block detector! Able to handle up to 9 Amps of continuous power to the track! Adjustable sensitivity Drives one Common Anode LED or Incandescent Bulb signal at each end of the block Constant Current Source means no need for external resistors for LEDs! Simple wiring Dec 12, 2022 · After the new year, I’m going to be putting together a DCC block detector roundup and comparison, similar to what I did with IR sensors a few years ago, highlighting the differences and similarities between the ATOM and its many competitors. ESU 50094 ECoS Detector Feedback Module - 2 and 3 Rail Operation with RailCom Our ECoSDetector feedback modules should be used to automate train operations. Beside the usual track occupancy detection, the train specific identification number can This board operates as a DCC occupancy detector for 4 blocks using remote CT coils. I'm a member of MERG and have read over the DTC2-T Dual Train Detector which would meet my needs but I've also 6 days ago · NOTE: Unlike some DCC Detectors (including BD-20), the DET-1 has a built-in adjustable Time-Delay-Off, which eliminates flickering on/off due to dirty wheels. " It's perfect for adding simple signaling to both home layouts and modules! Note: This version includes only one ATOM DCC block detector, and Step 2 - ATOM Detectors Based on your installation, you will need one or two ATOM DCC current-based block detectors. Feb 18, 2020 · Hi,I'm at the stage in my layout building where I'd like to add block detection. Compatible with a wide variety of other block detectors on the market, the ATOM provides two open collector outputs (one for detection, one for no detection) with optional pull-up resistors and features one touch sensitivity adjustment. Additionally, you generally buy one item only to find you need more to complete the picture… followed by the need to knit a nest of wiring. They are used as inputs to signal systems and control panels, and to indicate occupancy on hidden track and staging yards. SBS4DCC features real time inventory, fast service and free shipping options. Jul 27, 2006 · I have created a layout design that indicates the locations of blocks for both detection and signaling. The problem is I dont want to spend a lot or make the circuit myself plys I dont want to have to buy any more boosters. I am very satisfied with the response. Mar 6, 2016 · The CKT-BD1 – our brand new single channel DCC block detector This little DCC current-based detector is designed to be highly sensitive while being resistant to false triggering, robust, and very easy to install. Noise resistant and compatible with BDL168 sections. The BOD-8-SM can also be used stand-alone to create digital I/O signals for block occupancy. Part 2 will cover the computer configuration, and a demonstration of the new sections in action. Though I do like the idea that at some point I can expand it to run signals. Adjustable resistance/current detection section (DS) trip threshold. The "Power-Lok" feature monitors the DCC bus power. Train detection is accomplished by routing the DCC track feeders through an air core transformer located on the FBM-2 board. Sep 15, 2025 · The DCCBD current-based block detector can reliably detect trains powered by DCC track power for signaling or other applications. The BD20x detectors use a current sensing transformer as the device to sense the track current. Jan 2, 2021 · LCC will take some of the command traffic off the DCC bus. A power failure latches the detection status of each block until power is restored and re-stabilized. Block detection is most often used for setting up a signal system on a model railroad. Block detectors are offered in two basic ways. I have JMRI and DCC++ working. The second problem is found in reverse loops. In that case add a diode pair in the circuit between power bus 'A' and the second rail. When the current level exceeds the detection threshold current, the detector will report the block occupied. No matter what scale you model, a modular signal system will bring your layout or Free-mo module to life with realistic operating signals. More detail and pictures soon!* LEVEL: Engineers or Serious Tinkerers There are many tools to help you operate your layout and find issues with your trains and accessories. Low-cost, High-sensitivity DCC block-occupancy detection. I don’t know if this works with other DCC systems, and again the same block occupancy detectors from Digitrax must be between the isolated block and the dcc main feed. The single blue lines indicate blocks where the Rail A will be gapped, and the double blue lines indicate blocks where both the Rail A and Rail B will be gapped for power districts. Our easy-to-install ATOM DCC Block Detectors sense the current drawn by a locomotive, lighted car, or resistor equipped wheel set. 53 BD4N DCC 4 Block Occupancy Detector Low-cost, High-sensitivity DCC block-occupancy detection. The prototype detection is nearly Block detectors sense the presence of a locomotive or other rolling stock on a section of track. $19. For modular setups, one ATOM detector is required on each block of track - A and B. Jul 1, 2002 · Power Pro BD-20 DCC Block Detector Manual The BD-20 block detector module is normally used to indicate the presence of a locomotive, caboose or other rolling stock in a track section by sensing electrical current drawn by that rolling stock. BD20 Block Detector. Point detectors determine that some event has happened at one specific location. Without it systems like control panels, signals or animation that depend on knowing the position of your trains can’t function. The Block Watcher comes ready to install, all you have to do is to connect it between the DCC booster or circuit ATOM Block Detector User Manual Overview The Iowa Scaled Engineering ATOM (CKT-BD1) is a reliable, easy-to-install, single-channel DCC block detector. It is based on the resonant transformer circuit by Wayne Roderick of Teton Short Line to whom full acknowledgement is given. Jan 24, 2004 · The most advanced stuff is transponding. It provides complete isolation from the track by using transformer type sensors. DCC Detectors Discover our DCC Detection & Signaling collection for advanced automation and realism on your model railway. I'd like to build the layout so its suitable for JMRI to automate, but also leave RR-CirKits BOD4 Block Occupancy Detector This board operates as a DCC occupancy detector for 4 blocks using remote CT coils. In fact, for DCC railroaders, installing the JLC provided DCCOD cards is a great way to start building toward a more complete computer interface. The Block Watcher comes ready to install, all you have to do is to connect it between the DCC booster or circuit breaker The ATOM is an isolated, reliable, easy-to-install, single-channel DCC block detector. Detectors are available assembled or in kit form, and if more than one kit is ordered, we will assemble one free to use as a model along with our detailed assembly instructions. Jul 1, 2002 · BD-20 DCC Block Detector Manual The BD-20 block detector module is normally used to indicate the presence of a locomotive, caboose or other rolling stock in a track section by sensing electrical current drawn by that rolling stock. The sensors are usually attached to stand-alone logic boards that turn outputs on or off to signal occupancy detection. It is intended to be inserted inline with one block feeder wire and provide a signal indicating a track block has current flowing in it. 6K subscribers Subscribed Aug 28, 2025 · Block Detection is a method for detecting rolling stock within a given section of track. I want a fully automated layout. 1 LCC device (or node) can potentially talk to another and exchange information. Yards and automatic train control are some examples. ty, suitable for all scales and track wiring configurations. No electrical connection prevents "sneak path" short circuits. More Information More Information Item # BDL716 New Arrivals Dec 02, 2024 Preorder No Tariff Disclaimer No Scale Multi Roadnumber May Vary No Track & Accessories Signals Detection & Gates Power & DCC Supplies DCC - Stationary | Accessory DCC Specialties Block Watcher Block DetectorThe Block Watcher puts the power of a microprocessor to work analyzing the current feed to the rails. Find many great new & used options and get the best deals for Nce 0205 - Bd20 Block Detector DCC at the best online prices at eBay! Free shipping for many products! Jul 25, 2006 · As the title states I am interested in block detection. In Block Occupancy Detection for DC and DCC I demonstrated the use of an ACS712 sensor and an Arduino Uno to sense current draw across the rails, the basis for most block occupancy detection systems. Before I spend any more money, is occupancy detection (ie, current draw detection that will respond across the whole block) required? Or, if I was to use something else like IR sensors or (Block Occupancy Detector-8 - SM) This new board is compatible with LCC node sample mode which allows using output drivers on the same I/O port. Block Watcher Manual Block Watcher Review The Block Watcher puts the power of a microprocessor to work analyzing the current feed to the rails. Because the Based on a current transformer, the detector maintains Buy NCE NCE5240205 Block Module Detector/DCC, 0. There are a number of different advantages and disadvantages to the various sensor types which we aim to cover on this page. Introduction While various types of detector can be used to determine whether a specific block is occupied by a locomotive or item of rolling stock, including magnetically operated switches or infrared beam detectors, the simplest device to use with a DCC system is an inductive detector which measures, and reacts to, the electrical current being taken from the section of track designated as a Block occupancy detection is central to advanced layout control. So in the case of several interconnected turnouts, you only want 1 train in that whole section and thus making them 1 block will assure that. (Block Occupancy Detector-4) This board operates as a DCC occupancy detector for 4 blocks using remote CT coils. That is how our circuit works to tell you via the Signal Out (yellow wire) that a train is in The ATOM is an isolated, reliable, easy-to-install, single-channel DCC block detector. 00 Price: $30. However there can be other uses such as automation and for keeping track of locomotives and cars. Types of Detection Systems Two general categories of detection devices exist, point detectors and current (or occupancy) detectors. RJ45 jacks make connections to other occupancy bus modules very simple. szvvrpw jzzscy wnnci axb zlnikt vjmle bsdaeb mik mabns ohhys uvngg grgou obw tphx yxc