![]() Any software or hardware that is interested in transponding can then pick up that information for whatever you want. Since the occupancy detector knows which block the transponding receiver is connected to, it knows which block that pinged address is in, and sends that information out over LocoNet. When the transponding receiver receives a "ping" back, it notifies the occupancy detector that it received a ping. Therefore, they always know which address was last sent. The occupancy detector (BDL162/BDL168), through the RX4 (see below) transponding receiver, monitors track power to decode the address of all packets sent. This would be the decoder sending data back to the receiver. Scope traces show bursts of noise appearing on what is probably the preamble of the DCC packet. These minute changes in current flow are detected by the transponding system. According to the SurroundTraxx sales sheet, the decoder receives a packet addressed to it, and upon receipt of the second packet, the headlight is switched on and off at precisely defined intervals between the packets bits. ![]() This ping happens during a time, between packets, when the command station allows such things to happen without affecting other packets. When a transponder receives a DCC control packet (which happens many times per second), it responds with a "ping" (or response) on the tracks. Other decoder manufacturers have also begun offering RailCom compatible devices and multifunction decoders Lenz has recently added Railcom to its Gold line multifunction decoders to communicate to its LH100 and LH90 throttles in a similar fashion. It can also be used to implement braking and speed control sections, as well as automating hidden staging yards and other things where knowing an exact location of a loco would be handy. The DT400 throttle has a button to find a loco, and will report the loco's location in the throttle's display. When the locomotive (or car) equipped with a compatible decoder reports back, only the receiver attached to the block detector will receive that locomotive's (or car's) message, thereby letting the system know which block it is in. Transponding with Digitrax is accomplished with a transponding receiver (RX4) attached to the BDL162 or BDL168 occupancy detectors. This is useful when using computers to control your layout for whatever reason - automated layouts, collision avoidance, passenger service lines, etc.Ĭurrently, transponding is not part of the NMRA standard or RP. Transponding is used for locomotive and/or car locations. Transponding provides three potential advantages: letting the system know which signaling block the locomotive (or car) is in, transmitting data about the loco (or car) back to the system, and making sure a locomotive with a new command gets it quickly.ĭigitrax offers both multifunction and function decoders which support Transponding. Typically, when a multifunction decoder capable of transponding gets a packet, it reports back to the transponder which initiated communication. Sound effects, such as the SurroundTraxx system from SoundTraxx.Automation of train operations if needed.Staging yards and hidden trackage can be monitored, allowing for automation with computer software.Speed and other parameters from a specific vehicle can be transmitted back to the operators. ![]() This can be used by a computer, control a display panel, or allow some operations with a throttle. Detectors allow the real time location of trains anywhere on the layout.Operations mode read back of multifunction decoder CVs is possible when using decoders which support this feature.Digitrax command stations are compatible with Transponding. It is designed to work with any DCC system via LocoNet. This article deals with Digitrax's implementation and transponding refers to Digitrax Transponding technology.ĭigitrax's Transponding is proprietary and is not compatible with RailCom. ![]() The other approach is Digitrax's Transponding. ![]() One common method of transponding is RailCom. The term is a portmanteau of transmitter and responder.
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