Digikeijs DR 4088 series

Need help?

Do you have a question about the Digikeijs DR 4088 series and is the answer not in the manual?

Summary

Product Overview

General Product Information

Provides a general overview of the DR4088xx feedback module and its different versions (CS, OPTO, GND).

Technical Specifications

Details electrical specifications, including input capacity, load limits, and terminal cross-section.

Hardware Overview

Illustrates and explains the physical connectors and components of the DR4088xx module.

Programming the DR4088 xx

Assigning Start Address with DR50 xx

Explains how to set the starting address and module count for the S88(N) bus using the DR50xx tool.

DR4088 xx Reset Functionality

States that the DR4088xx module has no factory reset function as settings are not stored internally.

Connection Examples

DR4088 CS 2-Wire Track Connection

Illustrates connecting multiple DR4088CS modules for 2-wire track feedback with a DR5000 central unit.

DR4088 CS with DR5033 Booster (2-Wire Track)

Shows how to connect DR4088CS modules with a DR5033 Booster for 2-wire track systems.

DR4088 OPTO Hall Sensors (3-Wire Track)

Demonstrates wiring DR4088OPTO for Hall sensors on a 3-wire track system.

DR4088 OPTO Switch Track (2-Wire Track)

Details the connection of DR4088OPTO for switches on a 2-wire track system.

DR4088 GND Switches, Buttons, Reed Contacts

Presents connection examples for DR4088GND with switches, buttons, and reed contacts.

The Digikeijs DR4088xx is a versatile feedback module designed for model railway layouts, enabling the central unit to receive information about train movements and track occupancy. This device acts as an interface between the physical track and the digital control system, specifically connecting to the central unit via the S88(N)® bus. The DR4088xx is equipped with 16 feedback inputs, allowing for comprehensive monitoring of various sections of a model railway.

One of the key features of the DR4088xx is its availability in three distinct versions, each tailored to different track configurations and feedback methods:

DR4088CS (Current Sensor 2-wire track): This version is designed for 2-wire track systems and utilizes current sensors to detect the presence of trains. It monitors current draw in specific track sections, providing feedback when a train occupies that segment.
DR4088OPTO (Hall sensors, 3-wire track / Reed contacts, 3-wire track signal to track ground): The OPTO version offers flexibility for both 3-wire track systems using Hall sensors and 2-wire track systems with reed contacts. When used with Hall sensors in a 3-wire setup, it detects magnetic fields generated by trains. For 2-wire tracks, it can be connected to reed contacts, which are activated by magnets on rolling stock. This version is particularly important for 3-wire drivers who wish to report back against track ground when using a DR50xx central unit, as it provides a safe alternative to the GND version in such scenarios.
DR4088GND (3-wire track): This version is intended for 3-wire track systems. However, it comes with a crucial warning: it must not be used against track ground when connected to a DR50xx central unit due to the H-bridge (track output) in the DR50xx. Doing so will inevitably lead to the destruction of the DR50xx. For 3-wire drivers needing to report against track ground with a DR50xx, the DR4088OPTO version should be used instead.

The DR4088xx modules are designed to be interconnected in a bus (line) network, starting from the first feedback module and extending to subsequent ones. This daisy-chaining approach simplifies wiring and allows for expansion of the feedback system. The S88(N)® bus, which the DR4088xx utilizes, is a universal bus system capable of supporting a maximum of 256 feedback addresses. Addresses are assigned automatically and continuously, meaning there is no provision for individual address assignment on the S88(N)® bus itself.

Usage Features:

Connecting the DR4088xx to a central unit like the DR5000 is straightforward. The DR5000's ext88N connector serves as a compatible S88N® bus interface. Multiple DR4088xx modules can be connected to the central unit and to each other using standard RJ45 patch cables. The DR5000 is capable of managing a significant number of feedback modules, with a total capacity of 256 feedback modules (S88N®/ext88N) each with 16 inputs.

Programming the DR4088xx modules primarily involves defining their start address and the total number of modules on the S88(N)® bus within the central unit's software, such as the DR50xx tool. This is done by accessing the S88(N)® bus settings and inputting the required information. The system then automatically assigns the addresses sequentially.

For the DR4088OPTO version, various input devices can be connected. These include light barriers, Hall sensors, push buttons, switches, and reed contacts. The connections are made to the feedback inputs (1-8 and 9-16) and a common connection "C" for each detector group. For Hall sensors and light barriers, an external power supply (5V-20V DC/AC) is typically required. The DR4088OPTO is particularly useful for detecting the presence of trains on 3-wire tracks or for integrating manual feedback points like switches and buttons.

The DR4088CS version, designed for current detection, requires the track to be isolated on both sides for accurate feedback. This is crucial when integrating a booster like the DR5033 DIGIBOOST into the layout, as the booster provides additional power to specific track sections, and proper isolation ensures that current detection remains localized and effective.

Maintenance Features:

The DR4088xx modules are designed for ease of use and do not require complex maintenance. A red LED on the module provides visual feedback, flashing during load or activity on the S88N connection, which can be helpful for basic troubleshooting and status monitoring.

It is important to note that the DR4088xx modules do not have a function for resetting to factory settings. This is because no specific settings or functions are stored within the feedback module itself; all configuration is handled by the central unit. Therefore, a reset function is not necessary.

The warranty for Digikeijs products, including the DR4088xx, is 24 months. However, it is crucial to adhere to the operating instructions, as damage caused by non-compliance will invalidate the warranty. A significant condition is that the warranty is void if the housing of the product is opened. This emphasizes the importance of not tampering with the internal components of the device.

In summary, the Digikeijs DR4088xx feedback module offers a robust and adaptable solution for integrating track occupancy and event detection into a digital model railway system. Its different versions cater to various track types and feedback methods, while its compatibility with the S88(N)® bus and central units like the DR5000 ensures seamless integration and expandability. The straightforward programming and lack of internal settings simplify its operation, making it a practical choice for model railway enthusiasts.