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glossary:glossary_t [2014/11/20 02:46]
dpharris [Toti] Link to 'Train detection' 		glossary:glossary_t [2019/08/16 19:14]
Bob Vetterlein [Toggle]
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 Note that this resource page on the MERG website has not been updated for a very long time.\\  Note that this resource page on the MERG website has not been updated for a very long time.\\ 
-[[http://www.merg.org.uk/merg_resources/tcc.php|http://www.merg.org.uk/merg_resources/tcc.php]]+[[https://www.merg.org.uk/merg_resources/tcc.php]]
  
 ===== Technical Data ===== ===== Technical Data =====
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 A 'Toggle' is a combination of an operating lever and spring loading which causes the lever to be 'locked' at one or other extreme position. It is extensively used in mechanical assemblies, in which the extremes may be 'locked' by the 'toggle spring'. Another example is the 'Mole' self locking wrench in which the toggle action also gives strong mechanical advantage.     \\ The Electronic version is also a device that can be 'latched in one position or another, indeed sometimes called a 'latch'. A 'Toggle' is a combination of an operating lever and spring loading which causes the lever to be 'locked' at one or other extreme position. It is extensively used in mechanical assemblies, in which the extremes may be 'locked' by the 'toggle spring'. Another example is the 'Mole' self locking wrench in which the toggle action also gives strong mechanical advantage.     \\ The Electronic version is also a device that can be 'latched in one position or another, indeed sometimes called a 'latch'.
  
 +===== TORR ===== 
 +**T**rain **O**perated **R**oute **R**elease.\\  
 +A feature of prototype interlockings when routes are cancelled by passage of the train without need for the Signaller to take any action. Prior to the introduction of TORR the Signaller had to pull the entrance button or the equivalent action on the VDU panel.
 ===== Tortoise motor ===== ===== Tortoise motor =====
  
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 Train-on-Track Indicator. A device or electronic circuit designed to interwork with, or form part of a track circuit which provides an output suitable for connecting to signalling, an indicator panel or other electronic component such as a computer, when a piece of track or block section is occupied by a train or item of rolling stock. There are a number of MERG designs featuring amongst the Technical Bulletins, three of which have been offered as kits. See kits nos.56 (DCC only), 62/63 (DC and DCC) and the RPC FTC module. Train-on-Track Indicator. A device or electronic circuit designed to interwork with, or form part of a track circuit which provides an output suitable for connecting to signalling, an indicator panel or other electronic component such as a computer, when a piece of track or block section is occupied by a train or item of rolling stock. There are a number of MERG designs featuring amongst the Technical Bulletins, three of which have been offered as kits. See kits nos.56 (DCC only), 62/63 (DC and DCC) and the RPC FTC module.
  
-There are many methods to implement Toti, and what method is appropriate depends the purpose for which it is required, and on which traction system is used (DC, DCC, or else) -- note: not all methods work with all traction methods.  Detectors can use: mechanical switches; current detection (e.g. diode drop or coil); the transmission, reflection or interruption of light; magnetism; radio; ultrasound, or video.  The method might give simple occupancy information, or more extended information including train identification (e.g. RFID, RailCom, Transponding, barcodes, Lissy, video etc.).   See: [[glossary:Train detection]]+There are many methods to implement Toti, and what method is appropriate depends the purpose for which it is required, and on which traction system is used (DC, DCC, or else) -- note: not all methods work with all traction methods.  Detectors can use: mechanical switches; current detection (e.g. diode drop or coil); the transmission, reflection or interruption of light; magnetism; radio; ultrasound, or video.  The method might give simple occupancy information, or more extended information including train identification (e.g. RFID, RailCom, Transponding, barcodes, Lissy, video etc.).   See: [[glossary:glossary_t#train_detection|Train Detection]] 
 + 
 +=====TOU===== 
 +**T**urnout **O**perating **U**nit 
 +A mechanical device fitted below a point or turnout used to transmit the movement of the motor or manual system to the switch blades of the point/turnout. The Point Actuating and Locking Mechanism (PALM), a product of Ambis Engineering, is an example which may be seen toward the bottom of [[http://www.ambisengineering.co.uk/Products/Products_Index.htm|this webpage]].
 ===== Track circuit ===== ===== Track circuit =====
  
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-A means of generating a signal when a train or item of rolling stock is present. Quite commonly accomplished by means of a track circuit and ToTI, FTC or DTC module which detects an object for the whole of its traverse through a track section but also possible using spot detectors such as infra-red devices (see MERG Hector kit 72), Hall effect switches (see MERG kits 101, 102 and 103) and magnetically-operated reed switches (see MERG kits 97 and 104 - 109)+A means of generating a signal when a train or item of rolling stock is present. Quite commonly accomplished by means of a track circuit and ToTI, FTC or DTC module which detects an object for the whole of its traverse through a track section but also possible using spot detectors such as infra-red devices (see MERG Hector kit 72), Hall effect switches (see MERG kits 101, 102 and 103) and magnetically-operated reed switches (see MERG kits 97 and 104 - 109).  [[glossary:glossary_t#toti|ToTi]]
  
 +===== TriState =====
 +
 +tri-state or three-state logic allows an output port to assume a high impedance state in addition to the 0 and 1 logic levels, effectively removing the output from the circuit.
  
 ===== Transducer ===== ===== Transducer =====
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 A collective term that refers to the device that switches turnouts by means of a mechanical linkage, so that trains can be diverted from one track to another. A common example is the twin solenoid arrangement that, when pulsed with an electric current, cause the turnout throwbar to switch from one side of the track to the other. Actuators can also consist of high torque motors or [[glossary_s#servo|servos]] that change the turnout direction in response to an applied control signal. A collective term that refers to the device that switches turnouts by means of a mechanical linkage, so that trains can be diverted from one track to another. A common example is the twin solenoid arrangement that, when pulsed with an electric current, cause the turnout throwbar to switch from one side of the track to the other. Actuators can also consist of high torque motors or [[glossary_s#servo|servos]] that change the turnout direction in response to an applied control signal.
  
 +===== TVS =====
 +
 +[[https://en.wikipedia.org/wiki/Transient_voltage_suppressor|Transient Voltage Suppressor]]
 ===== Twinkling ===== ===== Twinkling =====
  
glossary/glossary_t.txt · Last modified: 2019/08/16 19:14 by Bob Vetterlein

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