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glossary:glossary_r [2020/03/12 05:25] – [RailCom] michael_smithglossary:glossary_r [2023/12/11 11:06] (current) – [RailCom] michael_smith
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 ~~NOTOC~~ ~~NOTOC~~
 [[start|Return to main Glossary index]] [[start|Return to main Glossary index]]
 +
  
 ===== RailCom ====== ===== RailCom ======
  
 +A relatively new DCC standard to implement return messages from a train/decoder.  It was originally developed by Lenz, and is now a RailCommunity 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 train/decoder It was originally developed by Lenz, and is now 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 short circuit across the track for approx470uSduring the inter-message idle packets and is known as the "cutout", then the decoder generates 30 mA serial encoded signal on to the trackThe data output by the decoder can be in either Channel 1 or Channel 2 or both, Channel 1 is for the loco addresses that the decoder will respond to. Channel 1 data is unsolicited data 2 (6 bit) bytes in size called datagramsthat 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)    
  
-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.      +An example of RailCom Channel 1 detectors are shown here [[projects:railcom]]
-   +  
-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: [[https://www.merg.org.uk/merg_wiki/lib/exe/fetch.php?media=dcc:specs:rcn-217.pdf|RailCommunity standard]] and [[http://www.esu.eu/en/support/white-papers/railcomplusr/|ESU RailCom Plus]].  
  
  
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 ===== RC filter ====== ===== RC filter ======
- 
  
 A resistance and capacitor network to limit a particular frequency     \\ Or noise rejection from motors A resistance and capacitor network to limit a particular frequency     \\ Or noise rejection from motors
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 ===== Rectification ====== ===== Rectification ======
- 
  
 The process of converting alternating current (AC) to direct current (DC). most offten using diodes. The diodes are commonly arranged in a set of 4 combined in one package. See also "Bridge rectifier". The process of converting alternating current (AC) to direct current (DC). most offten using diodes. The diodes are commonly arranged in a set of 4 combined in one package. See also "Bridge rectifier".
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 ===== Resistor ====== ===== Resistor ======
- 
  
 Resistor is the name for an electronic component exhibiting Resistance. Resistance is the property of a component which restricts the flow of electric current. Energy is used up as the voltage across the component drives the current through it and this energy appears as heat in the component. Resistance is measured in ohms, the symbol for ohm is an omega. 1ohm (written 1R0) is quite small for electronics so resistances are often given in 'k' (kilo) and M (meg). 1k = 1,000 (1k0); 1M = 1,000,000 (1M0). Resistors used in electronics can have resistances as low as 0.1ohm or as high as 10M. Resistor is the name for an electronic component exhibiting Resistance. Resistance is the property of a component which restricts the flow of electric current. Energy is used up as the voltage across the component drives the current through it and this energy appears as heat in the component. Resistance is measured in ohms, the symbol for ohm is an omega. 1ohm (written 1R0) is quite small for electronics so resistances are often given in 'k' (kilo) and M (meg). 1k = 1,000 (1k0); 1M = 1,000,000 (1M0). Resistors used in electronics can have resistances as low as 0.1ohm or as high as 10M.
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 ===== Resonator ====== ===== Resonator ======
- 
  
 A device used to produce an oscillation of a specific frequency, primarily for use as the clock signal for digital circuits. A device used to produce an oscillation of a specific frequency, primarily for use as the clock signal for digital circuits.
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 ===== Reverse polarity ====== ===== Reverse polarity ======
- 
  
 The Positive voltage goes to the Negative part of a circuit and vice versa.     \\ Used to reverse DC motors in trains. The Positive voltage goes to the Negative part of a circuit and vice versa.     \\ Used to reverse DC motors in trains.
  
  
-===== Reversed Linked Section Control ======+===== RFC ===== 
 + 
 +Request for Comment is a way of making a suggestion for a change to some standard or way of working. It is used within MERG for discussion of changes to the CBUS protocol.
  
-This is a method for the control of the switching of power to sections of track on a model railway layout.  It is described in Technical Bulletin T32/1 of April 2002.\\ Also see [[public:morag:start#files_from_morag_yahoo_group|here]] for articles on the subject. 
 ===== RFID ===== ===== RFID =====
 +
 **R**adio **F**requency **ID**entification\\  **R**adio **F**requency **ID**entification\\ 
  
-[[http://en.wikipedia.org/wiki/RFID|Wikipedea article]]\\ +[[wp>/RFID|Wikipedia: RFID]]\\ 
 [[glossary:thomasrfid|MERG Demonstration]]\\  [[glossary:thomasrfid|MERG Demonstration]]\\ 
 **MERG RFID systems**\\  **MERG RFID systems**\\ 
 The tags generally used in MERG RFID systems have a 40 bit ID number, that is 5 bytes, when transmitted there is then a sixth byte added which is a checksum for data integrity. The tag readers transmit the data over a serial link using [[glossary_h#ascii_hex|ASCII Hex]]. The start of a message is STX <0x02> this is followed by the 12 ASCII Hex characters of the data plus checksum, some readers then send LF <0x0A> CR <0x0D>, and finally ETX <0x03>. This makes a message of either 14 or 16 bytes in total.\\  The tags generally used in MERG RFID systems have a 40 bit ID number, that is 5 bytes, when transmitted there is then a sixth byte added which is a checksum for data integrity. The tag readers transmit the data over a serial link using [[glossary_h#ascii_hex|ASCII Hex]]. The start of a message is STX <0x02> this is followed by the 12 ASCII Hex characters of the data plus checksum, some readers then send LF <0x0A> CR <0x0D>, and finally ETX <0x03>. This makes a message of either 14 or 16 bytes in total.\\ 
 The MERG Concentrator replaces the STX with a reader identification letter, A to H or I to P. For CBUS the incoming data is converted back to its original 5 bytes and checked against the checksum. These 5 bytes are then transmitted as bytes 3 to 7 of an 8 byte message. <Opcode><DN/NN Hi><DN/NN Lo><data0><data1><data2><data3><data4> The MERG Concentrator replaces the STX with a reader identification letter, A to H or I to P. For CBUS the incoming data is converted back to its original 5 bytes and checked against the checksum. These 5 bytes are then transmitted as bytes 3 to 7 of an 8 byte message. <Opcode><DN/NN Hi><DN/NN Lo><data0><data1><data2><data3><data4>
-===== Risk assessment ====== 
  
 +
 +===== Risk assessment ======
  
 An analysis of the risks and the method of management in a strategy or practice. An analysis of the risks and the method of management in a strategy or practice.
  
  
-===== RMS ======+===== RLSC ======
  
 +Reversed Linked Section Control is a method for the control of the switching of DC power to sections of track on a model railway layout.  It is described in Technical Bulletin T32/1 of April 2002.\\ Also see [[history:morag:start#files_from_morag_yahoo_group|here]] for articles on the subject.
  
-Root Mean Square. This is what you read on an analogue meter used on AC voltage. It compares to the dc level. So it’s an average value.[[https://en.wikipedia.org/wiki/Root_mean_square|Wikipedia - RMS]] 
  
 +===== RMS ======
  
-===== Road Vehicle Control ======+Root Mean Square. This is what you read on an analogue meter used on AC voltage. It compares to the dc level. So it’s an average value.[[wp>Root_mean_square|Wikipedia - RMS]]
  
 +
 +===== Road Vehicle Control ======
  
 Usually refers to a electronic system to control model road vehicles. Usually refers to a electronic system to control model road vehicles.
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 ===== Route setting ====== ===== Route setting ======
- 
  
 This is used when you operate a set of instructions to drive a train from A>>>B with all the instructions to operate points and signals. This is used when you operate a set of instructions to drive a train from A>>>B with all the instructions to operate points and signals.
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 ===== RPC ====== ===== RPC ======
- 
  
 Remote Panel Control. RPC System - Remote Panel Interface ([[glossary:glossary_r&#rpi|RPI]])     \\ (RS232 Single Unit PC Interface Module) Includes [[glossary:glossary_r&#pcb|PCB]] and all components a MERG system \\ [[rpcsystem|Main article]] Remote Panel Control. RPC System - Remote Panel Interface ([[glossary:glossary_r&#rpi|RPI]])     \\ (RS232 Single Unit PC Interface Module) Includes [[glossary:glossary_r&#pcb|PCB]] and all components a MERG system \\ [[rpcsystem|Main article]]
-===== RPI ====== 
  
 +
 +===== RPI ======
  
 Remote Panel Interface. [[glossary:glossary_r&#rpc|RPC]] System - RPI.    \\ Serial interface module for PC control. RS485 Multi-Drop version. Includes [[glossary:glossary_p&#pcb|PCB]] and all components. a MERG system \\ [[rpcsystem|Main article]] Remote Panel Interface. [[glossary:glossary_r&#rpc|RPC]] System - RPI.    \\ Serial interface module for PC control. RS485 Multi-Drop version. Includes [[glossary:glossary_p&#pcb|PCB]] and all components. a MERG system \\ [[rpcsystem|Main article]]
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 ===== RS232 ====== ===== RS232 ======
- 
  
 It is commonly used in computer serial ports. Is a standard for serial binary data signals connecting between a DTE (Data terminal equipment) and a DCE (Data Circuit-terminating Equipment) It is commonly used in computer serial ports. Is a standard for serial binary data signals connecting between a DTE (Data terminal equipment) and a DCE (Data Circuit-terminating Equipment)
-[[https://en.wikipedia.org/wiki/RS-232]]+[[wp>RS-232|RS232]] 
  
 ===== RS485 ====== ===== RS485 ======
  
- +It is commonly used in computer serial ports. RS485 enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (35 Mbit/s up to 10 m and 100 kbit/s at 1200 m). Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 metres). [[wp>rs-485|RS485]]
-It is commonly used in computer serial ports. RS485 enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (35 Mbit/s up to 10 m and 100 kbit/s at 1200 m). Since it uses a differential balanced line over twisted pair (like EIA-422), it can span relatively large distances (up to 4000 feet or just over 1200 metres)+
  
  
 ===== RSA ====== ===== RSA ======
- 
  
 The RSA is a RS 232 to RS485 converter a MERG system The RSA is a RS 232 to RS485 converter a MERG system
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 ===== RSE ====== ===== RSE ======
- 
  
 [[glossary:glossary_r&#rpc|RPC]] System - RSE (Remote Stack Extension)     \\ Allows a stack of [[glossary:glossary_r&#rpc|RPC]] modules to be divided into remotely located parts, connected using standard 4 pair Cat 5 network cables. Includes [[glossary:glossary_p&#PCB|PCB]]s and all components. A MERG system [[glossary:glossary_r&#rpc|RPC]] System - RSE (Remote Stack Extension)     \\ Allows a stack of [[glossary:glossary_r&#rpc|RPC]] modules to be divided into remotely located parts, connected using standard 4 pair Cat 5 network cables. Includes [[glossary:glossary_p&#PCB|PCB]]s and all components. A MERG system
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 ===== RTC ====== ===== RTC ======
- 
  
 Computer controller train controller from the [[glossary:glossary_r&#rpc|RPC]] collection a MERG system Computer controller train controller from the [[glossary:glossary_r&#rpc|RPC]] collection a MERG system
 +
 +
 +===== RTFM =====
 +
 +Read The Flipping Manual
 +
 +
 +===== RTOS =====
 +
 +Real Time Operating System.
glossary/glossary_r.1583990755.txt.gz · Last modified: 2020/03/12 05:25 by michael_smith

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