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glossary:glossary_r [2020/03/12 05:25]
michael_smith [RailCom]
glossary:glossary_r [2020/03/12 05:27] (current)
michael_smith [RailCom]
Line 8: Line 8:
 A relatively new DCC standard to implement return messages from a train/​decoder. ​ It was originally developed by Lenz, and is now a NMRA standard. ​ Further development is in progress by European companies, and this extension is called RailComPlus.  ​ A relatively new DCC standard to implement return messages from a train/​decoder. ​ It was originally developed by Lenz, and is now a NMRA standard. ​ Further development is in progress by European companies, and this extension is called RailComPlus.  ​
  
-RailCom works by having the command-station/​booster stop driving the rails between DCC packets and placing a short circuit across the track for approx.470uS,​ during the inter-message idle packets and is known as the "​cutout",​ then the decoder generates a 30 mA serial encoded signal on to the track. The data output by the decoder can be in either 1 or 2 "​channels"​ or both, Channel 1 is for the loco address that the decoder will respond to. Channel 1 data is unsolicited data 2 (6 bit) bytes in size, that is to say the data is sent out without being requested and is received and decoded by "​local"​ detectors around the layout in track "​blocks"​. Channel 2 data can be up to 6 (6 bit) bytes and is only transmitted out by the decoder in response to a command sent by the command station. this data is received and decoded by only one "​global"​ detector on the layout. Therefore the maximum data transmitted in the DCC cutout period for CH1 and CH2 is 8 bytes. ​    +RailCom works by having the command-station/​booster stop driving the rails between DCC packets and placing a short circuit across the track for approx.470uS,​ during the inter-message idle packets and is known as the "​cutout",​ then the decoder generates a 30 mA serial encoded signal on to the track. The data output by the decoder can be in either 1 or 2 "​channels"​ or both, Channel 1 is for the loco address that the decoder will respond to. Channel 1 data is unsolicited data 2 (6 bit) bytes in size called datagrams, that is to say the data is sent out without being requested and is received and decoded by "​local"​ detectors around the layout in track "​blocks"​. Channel 2 data can be up to 6 (6 bit) bytes and is only transmitted out by the decoder in response to a command sent by the command station. this data is received and decoded by only one "​global"​ detector on the layout. Therefore the maximum data transmitted in the DCC cutout period for CH1 and CH2 is 8 bytes (datagrams).     
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 RailCom/​Plus allows: the identification of unknown trains; block occupancy; transmission of train information,​ such as its actual speed; and more efficient '​on-the-main'​ programming. ​ See: [[http://​www.nmra.org/​sites/​default/​files/​s-9.3.2_2012_12_10.pdf|NMRA standard]] and [[http://​www.esu.eu/​en/​support/​white-papers/​railcomplusr/​|ESU RailCom Plus]].  ​ RailCom/​Plus allows: the identification of unknown trains; block occupancy; transmission of train information,​ such as its actual speed; and more efficient '​on-the-main'​ programming. ​ See: [[http://​www.nmra.org/​sites/​default/​files/​s-9.3.2_2012_12_10.pdf|NMRA standard]] and [[http://​www.esu.eu/​en/​support/​white-papers/​railcomplusr/​|ESU RailCom Plus]].  ​
glossary/glossary_r.txt ยท Last modified: 2020/03/12 05:27 by michael_smith