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glossary:glossary_c [2018/07/17 09:35]
Bob Vetterlein [CAN]
glossary:glossary_c [2019/12/16 01:20] (current)
Bob Vetterlein [CARLOS]
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-Bruce Chubb'​s Computer/​Model Railroad Interface system C/MRI. A series of modules and support available for the system obtained from JLC Enterprises Inc. For website see [[http://​www.merg.org.uk/​links.php|links page]]+Bruce Chubb'​s Computer/​Model Railroad Interface system C/MRI. A series of modules and support available for the system obtained from JLC Enterprises Inc. For website see [[https://​www.merg.org.uk/​links.php|links page]]
  
  
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-A system of control using DC power where more than one controller or cab is used to drive trains across the tracks controlled by another controller. This requires switches to transfer the supply from the cabs to the parts of the layout they will control, the switches preventing two or more cabs controlling simultaneously the same section of track.+A system of control using DC power where more than one controller or cab is used to drive trains across the tracks controlled by another controller. This requires switches to transfer the supply from the cabs to the parts of the layout they will control, the switches preventing two or more cabs controlling simultaneously the same section of track. ​
  
  
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-Refer to [[http://​www.merg.org.uk/​Members/LC/LC01_1.pdf|MERG TB]] on layout cabling ​LC01 (Note available to members only)+Cabling, or wiring, is the process of interconnecting devices, modules or areas together using wires usually over some distance. You could, for example, run some cabling between a switch board and some track switches elsewhere on a layout. MERG members can refer to [[https://​www.merg.org.uk/​merg_tbs/download.php?​fileid=941|MERG TB]], LC01_2.pdf, covering ​layout cabling.
  
-===== CAN =====+===== CAN or CAN BUS =====
  
-Refers to Controller Area Network, and is a bus standard designed to allow microcontrollers and devices to communicate with each other. ​ It is a message-based protocol, designed specifically for automotive applications but now also used in other areas including ​MRR.  Development of CAN bus was invented in 1983 by Robert Bosch.  See: [[http://​en.wikipedia.org/​wiki/​CAN_bus|CAN_bus]]+Refers to Controller Area Network, and is a bus standard designed to allow microcontrollers and devices to communicate with each other. It is a message-based protocol, designed specifically for automotive applications but now also used in other areas including ​model railroading.  See: [[http://​en.wikipedia.org/​wiki/​CAN_bus|CAN_bus]] 
 + 
 +===== CAN related projects from MERG ===== 
 + 
 +Some of the acronyms may be found with the suffix '​C'​.\\  
 +**CANCMD** The MERG DCC Command station, in the DCC section of the Kit Locker.\\  
 +**CANCAB** The MERG DCC Handset, in the DCC section of the Kit Locker.\\  
 +**CANACC4** MERG CBUS Solenoid point motor driver, 1st generation CBUS Kit.\\  
 +**CANACC5** MERG CBUS Driver for motorised point actuators, 1st generation CBUS Kit.\\  
 +**CANACC8** MERG CBUS 8 Output steady state driver, 1st generation CBUS Kit.\\  
 +**CANACE3** MERG CBUS Control panel switch input module, 1st generation Kit.\\  
 +**CANACE8** MERG CBUS 8 input module, 1st generation Kit.\\  
 +**CANLED** MERG CBUS Control panel LED driver, 1st generation Kit.\\  
 +**CANPAN** MERG CBUS Control panel combined switch input and LED driver, 2nd generation Kit.\\ ​
  
-===== CAN... ===== 
-CANCMD, CANCAB, CANACC4, CANACC5, CANACC8, CANACE3, CANACE8,​\\ ​ 
-**this entry is a work in progress** 
 ===== Capacitor ===== ===== Capacitor =====
  
 +A capacitor is a basic electronic component and can have many uses. Small value capacitors are often used in an electrical signal path to block DC voltage and only let AC signals/​voltages through. Small value capacitors may also be used with other components to make up filter circuits to pass or limit certain frequencies along a wire. Large value capacitors are often used for short term electrical storage or to smooth out AC ripple in power supplies that get their power from an AC input. ​ Combining several large capacitors, or using one or more “super” capacitors, may be used in a model railroad engine to provide momentary power when crossing parts of a track (dirty track or gaps in track for example) which would normally cause the engine to stutter or stop.  ​
  
-capacitor ​can store electric energy when disconnected ​from its charging circuit, so it can be used like a temporary battery    \\ [[:​glossary:​capacitor|Main article]]+The common term “bypass ​capacitor” refers to adding a small value capacitor directly across the power and ground pins of an IC in order to help remove AC ripple or noise from the DC voltage ​used by the IC
  
-===== Carlos =====+Capacitors can be made from may types of materials or processes such as mica, tantalum, polystyrene,​ electrolytic or ceramic. Each type has its uses and one type generally will not work in place of other types. Usually the type is called out on a parts list or schematic, or based on the value and tolerance, it may be assumed to be a certain type. Capacitor values are measured in “Farads”,​ generally microfarads (µF), nanofarads (nF) or picofarads (pF).     \\ [[:​glossary:​capacitor|Main article]]
  
 +===== CARLOS =====
  
-computer programme for creation of model railway control panels on screen. ​Carlos ​is a DOS program developed by MERG member John Down and can be used with the RPC system. See TB G18/1 or follow this link for more information.+ 
 +CARLOS is an acronym for Computer Aided Railway Layout Operating System, a computer programme for creation of model railway control panels on screen. ​CARLOS ​is a DOS program developed by founding ​MERG member, the late John Down, it was designed to be used with the Remote Panel Control ([[glossary_r#​RPC|RPC]]) ​system. See TB G18/1 for more information
 + 
 +An adaptation of the program may be seen at the occasional model railway exhibition running the [[glossary_h#​Hysteresis loop|Hysteresis loop]] demonstration. Until recently running on a Windows 95 laptop, it now runs on a Raspberry Pi with a CEEEDTOP screen.
  
 ===== CBUS ===== ===== CBUS =====
-Layout ​control bus, see [[http://​www.merg.org.uk/​merg_resources/​cbus.php|CBUS resources page]]\\ ​+CBUS refers to the CAN based layout ​control bus created by MERG, see [[https://​www.merg.org.uk/​merg_resources/​cbus.php|CBUS resources page]]\\ ​
 Public Wiki area for [[public:​cbuspublic:​start|CBUS]]\\ ​ Public Wiki area for [[public:​cbuspublic:​start|CBUS]]\\ ​
 +
 +=====CDC=====
 +Communications Device Class \\ A class (type) of [[glossary_u#​usb|USB]] device. If A USB device identifies itself as a CDC it is telling the host that it is (or emulates) a USB-to-serial communications port converter. Modern operating systems like Windows 10 or Linux use this to know it should create a Virtual Comm Port [[glossary_v#​vcp|VCP]]. Modern operating systems generally use this to determine that it should automatically load a USB driver to simulate a Windows COM or Linux TTY port. 
 +
 ===== CDU ===== ===== CDU =====
  
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-===== CE =====+===== CE Mark =====
  
  
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 ===== Ceramic ===== ===== Ceramic =====
  
- +Ceramic ​is term for materials formed by heating an inorganic non-metallic ​substance. Ceramic ​is a material commonly used for electrical components. It is generally used either as an insulating material for voltages/​currents,​ or as a component in making capacitors. Most of the references to ceramic on this site relate to ceramic capacitors, which are generally lower value capacitors.  ​Ceramic is also a material, like plastic, that may be used to make the housing for an IC. When buying an IC, you may have an option for ceramic or plastic. The functionality should be the same but the cost is usually different. ​ Another place ceramic is used is to generate a clock signal for a microprocessor by using a ceramic ​resonator component instead of a more common quartz crystal component
-The word ceramic ​is derived from the Greek word κεραμικος (keramikos, "​having to do with pottery"​). The term covers ​inorganic non-metallic ​materials whose formation ​is due to the action ​of heat.  ​This can refer to the packaging of integrated circuits in a ceramic ​material.+
  
  
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-Programmable 4 - channel ​Servo Driver Type ‘Servo4’ For operation ​of model railway accessories such as turnouts and semaphore signalsThe word channel refers to the ability to control 4 devices.     \\ See the MERG newsletter (now called ​Journal) ​of [[http://​merg.org.uk/​merg_journal/​download.php?​fileid=35&​userid=0|March 2006]] pages 8 and 9 on the web site.+channel ​is a specific path, like a canal or river of communicationWhen a microprocessor communicates with several ​devices, it can be said that the communications take place on series ​of separate channelsThe term channels may describe how many independent devices can be controlled by a productAn example would be a “four channel servo control board” that may have one input but controls four servos over four different channels, perhaps using four identical circuits
  
  
 ===== Charlieplexing ===== ===== Charlieplexing =====
  
 +Charlieplexing is a method of multiplexing a few I/O ports out of a microcontroller to control a large number of LEDs. It is common for an I/O port to either provide (source) current or provide a low level (sink) from another source of current applied to an LED, to allow an LED to light. ​ Occasionally when designing a microprocessor circuit that has LEDs, a designer finds there are more LEDs than available I/O pins to control them. 
  
-Charlieplexing ​is a method of matrix multiplexing which uses each wire in turn as the sink.  See the MERG newsletter (now called a Journal) of [[http://​merg.org.uk/​merg_journal/​download.php?​fileid=35&​userid=0|March 2006]] pages 34 and 35 on the web site.+Charlieplexing ​differs from the common one-port-controls-one-LED scheme by allowing ​each port to alternately source current or sink current. Charlieplexing takes advantage of the dual use of the I/O port combined with a special LED configuration. The scheme modulates the I/O ports quickly such that the desired individual LEDs appear on. Depending on how the pin wiring and LEDs are arranged, a smaller number of microprocessor pins can control a much larger number of LEDs.  See the MERG newsletter (now called a Journal) of [[https://​merg.org.uk/​merg_journal/​download.php?​fileid=35|March 2006]] pages 34 and 35 on the web site for additional information.
  
  
 ===== Circuit ===== ===== Circuit =====
  
 +An electrical circuit is a network (wiring scheme) that has a closed loop, providing current to the network and giving a return path for the current back to the starting point. Usually there are electrical components connected in series or parallel with the network wiring. An important characteristic of a network is that the amount of current being providing at the start of the network will exactly equal the amount of current returning to the start of the network, regardless of how the current passed though the network or the number of components in the network. ​
  
-An electrical circuit is a network that has a closed loop, giving a return path for the current and usually connecting a series of electrical components. 
  
 +===== Clearing Point =====
  
-===== Cleaning Tracks ===== 
  
- +This railroad related term describes ​a location in advance of a signal box up to which the track must be cleared to allow a signalman to accept a train into a block section. ​This assures that only one train can occupy a block section at a time.      ​\\ See the MERG newsletter (now called a Journal) of [[https://​merg.org.uk/​merg_journal/​download.php?​fileid=35|March 2006]] pages 23 on the web site.
-There is a commercial product called Relco. More information on cleaning tracks can be obtained from Southern E-Group web site.     \\ [[http://​freespace.virgin.net/​c.gardner/​semg/​relco.htm|http://​freespace.virgin.net/​c.gardner/​semg/​relco.htm]] +
- +
- +
-===== Clearing point ===== +
- +
- +
-This is a location in advance of a signal box up to which the track must be clearto ​allow a signalman to accept a train into a block section. ​    ​\\ See the MERG newsletter (now called a Journal) of [[http://​merg.org.uk/​merg_journal/​download.php?​fileid=35&​userid=0|March 2006]] pages 23 on the web site.+
  
  
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-===== Closed ​loop =====+===== Closed ​Loop =====
  
- +In electronicsclosed loop system often refers ​to having a control ​device that has feedback ​path back to the control device, which provides a measurement of what is actually taking placeThe control device can then adjust its output accurately and predictably A simple example of open loop vs. closed loop would be with room with a light dimmer. ​ An open loop scenario would be when you have your eyes closed. As you adjust ​the brightness, you cannot be sure how bright the room is A closed loop scenario is when you have your eyes openAs you adjust ​the brightnessyour eyes will show (feedback to you) how bright the room is.  Closed loop processes can be seen in model railroading in the way a DCC decoder measures ​the back-EMF ​(a form of electromagnetic feedback) from the motor it controls. By using the back-EMF feedback ​signal the decoder can maintain a constant speed going up or down a grade. Many model railroad circuits can use a closed loop system for determiningfor example, if points are really closed, a track switch is really set for the right direction or what the real position of a servo is.
-To avoid the problems of the open-loop controllercontrol theory introduces feedback. A closed-loop controller uses feedback ​to control ​states or outputs of dynamical system. Its name comes from the information ​path in the system: process inputs (e.gvoltage applied to motor) ​have an effect on the process outputs (e.gvelocity or position of the motor)which is measured with sensors and processed by the controller; ​the result ​(the control ​signal) is used as input to the processclosing ​the loop.+
  
  
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-CMOS ("see-moss"), which stands for complementary metal-oxide semiconductor,​ is a major class of integrated circuits. CMOS chips include microprocessor,​ microcontroller,​ static RAM, and other digital logic circuits. The central characteristic of the technology is that it only uses significant power when its transistors are switching between on and off states. Consequently,​ CMOS devices use little power and do not produce as much heat as other forms of logic. CMOS also allows ​high density of logic functions on a chip    \\ The word "​complementary"​ refers ​to the fact that the design ​uses pairs of transistors ​for logic functions, only one of which is switched on at any time    \\ The phrase "​metal-oxide-semiconductor"​ is reference to the nature of the fabrication process originally used to build CMOS chipsThat process created field effect transistors having ​metal gate electrode placed on top of an oxide insulator, which in turn is on top of semiconductor material. Instead of metal, today the gate electrodes are almost always made from a different material, polysilicon,​ but the name CMOS nevertheless continues to be used for the modern descendants of the original process.+CMOS (see-moss), which stands for complementary metal-oxide semiconductor,​ is a major class of integrated circuits. CMOS chips include microprocessor,​ microcontroller,​ static RAM, and other digital logic circuits. The central characteristic of the technology is that it only uses significant power when its transistors are switching between on and off states. Consequently,​ CMOS devices use little power and do not produce as much heat as other forms of IC logic. ​Another important characteristic is that CMOS devices often have wider operating voltage range than non-CMOS ​logic devicesThis can make it easier to power a device from batteries or easier ​to design ​into a circuit mixed with traditional analog/​linear devices like transistors ​and op-ampsYou can often recognize ​a CMOS IC from its part number A typical legacy logic chip would have part number like 7404. The same function chip in CMOS would have number like 74C04 or 74HC04.
  
  
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-In electrical engineering,​ an electromagnetic coil is formed when a metallic or conductive wire is looped around a core to create an electronic inductor or electromagnet. One loop of wire is usually referred to as one turn. A coil consists of one or more turns. For use in an electronic circuit, electrical connection terminals called taps are often connected to a coil. Coils are often coated with varnish and/or wrapped with insulating tape to provide additional insulation and secure them in place. ​A completed ​coil assembly with taps etc. is often called ​winding. A transformer is an electromagnetic device that has primary winding and a secondary winding that transfers energy from one electrical circuit to another by magnetic coupling without moving parts. The term tickler coil usually refers ​to a third coil placed ​in relation to primary coil and secondary ​coil.+In electrical engineering,​ an electromagnetic coil is formed when a metallic or conductive wire is looped around a core to create an electronic inductor or electromagnet. One loop of wire is usually referred to as one turn. A coil consists of one or more turns. Coils are often coated with varnish and/or wrapped with insulating tape to provide additional insulation and secure them in place. ​ 
 +In relation to the MERG site, you will mostly see the terms coil or inductor usedCoil is mostly used related to electromechanical devices (like solenoid, switch machine windings or magnetic pickup coils) used on layout The term inductor is mostly used to describe ​type of coil used in an electrical circuit like power supply or an oscillator. Many people use the terms interchangeably.  
 +The coil or inductor unit of measure uses the term “Henry”. The typical terms are millihenrys (mH) or microhenrys(µF),​ but very large filtering coils for power supplies will often have values that can range up to one or more henries (H)
  
  
-===== Colour ​light =====+===== Colour ​Light =====
  
  
-Refers in model railways to model signals with coloured ​LED or incandescent lights for red, yellow, and green.+Refers in model railways to model signals with individual ​coloured ​LEDs or incandescent lights for red, yellow, and green.
  
  
-===== Com port =====+===== COM Port =====
  
  
-In computer hardware, a port serves as an interface between the computer and other computers ​or devices in the form of an electrically wired outlet on a piece of equipment into which a plug or cable connectsThese hardware ports have different physical shapes such as malefemaleround, rectangular,​ square, oblong, etc. There is some standardization to physical properties ​and functionFor instance, most computers ​have a keyboard port (currently round, ​or telephone type), into which the keyboard is connected    \\ Hardware ports can almost always ​be divided into two groups: +COM port is short for communications port. Related to PCs, “COM ports” are serial communication interfaces historically used to connect to terminals, MODEMs ​or printers. They followed ​the RS-232 ​or V.24 standards for functionpin outspeed and voltage levels Over the years these traditional serial interfaces ​have become less common on PC hardware and have been replaced with “virtual communications ports” ​or VCPs utilizing ​the USB interfaceTo the PC operating system they appear to be the old hardware serial interfaces but often use USB driver to convert ​and communicate ​the serial information ​over a USB cableThe USB cable may be hooked to remote device which is designed for USB operation. Alternately the USB cable may have converter built in which turns the USB serial ​data back into 9-pin or 25-pin V.24 type interface. In all these cases the PC the serial interface is referred to as a COM port regardless of how the serial communication physically/​electrically gets out of the PC.  In the case you might be a Linux user, COM ports are known as TTY ports and perform generally ​the same function.
- +
- +
-    * Serial ports send and receive one bit at time via a single wire pair (Ground ​and +/-). +
-    * Parallel ports send multiple bits at the same time over several sets of wires. +
- +
- +
-A Software Port (usually just called ​'​port'​) ​is a virtual ​data connection that can be used by programs to exchange data directly, instead of going through ​file or other temporary storage locationThe most common of these are TCP and UDP ports which are used to exchange data between computers on the Internet. +
  
 ===== Command station ===== ===== Command station =====
  
  
-The Command Station ​is the brains ​of a DCC system ​of control and is in control of the whole system. After receipt of requests from one or several cabs or throttles, the command station’s internal computer translates these cab requests into decoder commands in the form of digital packets. These are received via the track in the decoders fitted in locomotives or other accessory decoders ​such as the type used to control points and signals.+The Command Station ​handles ​the control ​of a DCC based system. All commands are processed by the Command Station After receipt of requests from one or several cabs (throttles), the command station’s internal computer translates these cab requests into decoder commands in the form of digital packets. These are sent through ​the track to decoders fitted in locomotives or accessory decoders ​which control points and signals. ​
  
  
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-A wire or connector that is Common or connected to all the components of a circuit.+A wire or connector that is Common or connected to many or all of the components of a circuit. It is often meant to refer to a common ground/​earth connection used by multiple components. It may also refer to a common signal, like a system clock used by multiple electrical components, or a common power connection.
  
  
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-Is one way of wiring a model railway with fewer wires     ​\\ {{:​glossary:​crwfig3.gif}} \\ [[http://​rail.felgall.com/​crw.htm|http://​rail.felgall.com/​crw.htm]]+One way of wiring a model railway with fewer wires. It can be thought of like automobile wiring. In automobiles,​ the metal chassis is the common ground connection, returning all circuits back to a battery connection. In this case dozens of individual ground return wires from all over the automobile are not needed. In the case of a model railway, generally a heavy gauge wire can be run around the layout that most or all circuits can use as a common return path (usually ground/​earth) for signals or power to an originating point. ​     ​\\ {{:​glossary:​crwfig3.gif}} \\ [[http://​rail.felgall.com/​crw.htm|http://​rail.felgall.com/​crw.htm]]
  
  
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-Conductors are materials that allow electrical ​charges ​to flow through them. They are the opposite of insulators. Also see [[https://​en.wikipedia.org/​wiki/​Semiconductor|semi-conductor]].+Conductors are materials that allow electrical ​current ​to flow through them. They are the opposite of insulators. Also see [[https://​en.wikipedia.org/​wiki/​Semiconductor|semi-conductor]].
  
  
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-Oscillator that uses a quartz Crystal ​in its feedback path to maintain ​stable output ​frequency+A crystal ​in the context of this web site refers ​to an electronic component made from a quartz crystal that oscillates at specific ​frequency to provide a timing signal ​to an oscillator circuit or microprocessor
- +
- +
-===== CSA ===== +
- +
- +
-Believed ​to be an out dated method of assessment overtaken by the CE marking on products. +
- +
- ​link ​to the Canadian Standards Association Wiki page +
-https://​en.wikipedia.org/​w/​index.php?​title=CSA_Group&​oldid=729578823 +
- +
-Still Used today.+
  
  
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-Electric current is by definition the flow of electric charge. The SI unit of electric current is the ampere ​(A)     \\ Measured in amperesit is the flow of electrons ​through ​conductorAlso know as electron flow.+Electric current is by definition the flow of electric charge ​(electron flow) through a wire, device or circuit. The standard ​unit of electric current is the Ampere ​(A), which is a measurement of a certain amount ​of electrons ​passing ​given point in one second See also AMP.
  
  
-===== Current ​shunt =====+===== Current ​Shunt =====
  
  
-In electronics,​ a Current Shunt is a device ​which allows electrical ​current to pass around another point in the circuit.+In electronics ​current shunt can be a device used to measure currentor method to allow some current to bypass a device or circuit. In the first case a current shunt would typically be a very low ohm resistance inserted into a circuit such that the voltage drop across the shunt is related to the amount of current passing through the shunt (can be determined using an Ohms law formula). An example would be that if a one ohm resistance shunt is inserted in the circuit path and two volts was measured across the shunt, it would mean two amps are flowing through the shunt/​circuit. ​ In the second case a designer may insert a resistance or active component, like a transistor, across ​a device ​such as a voltage regulator to allow more current to pass from one side of the voltage regulator to the other. ​ This might be done if the voltage regulator cannot, on its own, provide enough current to power the attached ​circuit. ​
  
  
-===== CVs =====+===== CV - Configuration Variable ​=====
  
  
-A CV is a __C__onfiguration __V__ariable that is a characteristic of a DCC decoder that can be customised ​by the user. CV’s are defined by the NMRA. For example the address of a locomotive ​is located in CV1. Significant modifications can be made to the performance of a locomotive by changing the CV’s.+Configuration Variable (CVis a setting in a DCC decoder that can be customized ​by the user. Many CV’s are defined by the NMRA, such as CV1 for address of a locomotive, but individual vendors may add or change some based on the features provided by the DCC decoder Significant modifications can be made to the performance of a locomotive by changing the CV’s.
  
  
glossary/glossary_c.1531820139.txt.gz · Last modified: 2018/07/17 09:35 by Bob Vetterlein