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glossary:glossary_r [2017/02/16 10:10] – external edit 127.0.0.1glossary:glossary_r [2020/03/03 18:09] – [Reversed Linked Section Control] added section JohnFletcher
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 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 ======
 +
 +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.
 ===== RFID ===== ===== RFID =====
 **R**adio **F**requency **ID**entification\\  **R**adio **F**requency **ID**entification\\ 
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 [[http://en.wikipedia.org/wiki/RFID|Wikipedea article]]\\  [[http://en.wikipedia.org/wiki/RFID|Wikipedea article]]\\ 
 [[glossary:thomasrfid|MERG Demonstration]]\\  [[glossary:thomasrfid|MERG Demonstration]]\\ 
 +**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 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 ======
  
glossary/glossary_r.txt · Last modified: 2023/12/11 11:06 by michael_smith

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