On-board Railway Dynamic Route Map (DRM) Systems
Traditional Railway Passenger Information systems have based on PC-server with LCD-displays attached to it using VGA or HDMI cables and repeaters or media converters. This centralized system has several challenges and limitations. The DRM-series intelligent train Passenger Information Displays enable an HD-resolution visual experience with rich media content using a distributed architecture. Display signals or display information is not sent through the vehicle. Each DRM-display manages its own content delivery based on control information received from the train signaling system or TCMS over Ethernet, MVB or isolated serial RS-485.
Furthermore, one DRM in the train or tram coach can be configured as the vehicle's master device, which connects to the vehicle data bus, while slave DRM-devices connect to the master using a daisy-chained RS-485 network reducing the complexity of wiring and cost.
A power efficient dual-core Freescale i.MX6 LINUX processor with advanced firmware controls the operation of the DRM, and the delivery of rich media content including animations, effects, static images as well as HD-video. No host train coach PIS servers are required, media is stored in each device and can be updated over service WiFi or Ethernet. The application software is LINUX based, enabling integrators to use the platform independent QT toolchain for the graphical interface design, and compile their QT application to work on the DRM-series displays. These open SW interfaces and development toolchains accelerate project completion, and enables systems integrators to easily maintain their applications.
The DRM-series railway displays can connect directly to the vehicle's 110VDC power rail. Proprietary multi-stage protection and filtering circuitry is designed to exceed the requirements of EMC and immunity standards EN50155 and EN50121.
Duragon Systems can provide customization services, which can include engineering, production and certification. Available options include different LCD sizes, ranging from 28" to 48", various aspect ratios (16;3 and 16:1.5), mechanical and enclosure solutions, as well as project specific functionalities or SW interfaces to other onboard systems.
The figure below illstrates an Ethernet ETBN system with DG-DRM48-R-LITE connected to the consist network switches using a single port with daisy chain downstream Ethernet for other DRM. The internal Ethernet switch in each DRM48-R-LITE has a failsafe automatic bypass relay circuit, with enables network operation in case one node should fail.