glossary:glossary_r
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glossary:glossary_r [2016/09/27 16:30] – [Resistor] thenudehamster | glossary:glossary_r [2023/06/16 06:52] – [RailCom] michael_smith | ||
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===== RailCom ====== | ===== RailCom ====== | ||
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A relatively new DCC standard to implement return messages from a train/ | A relatively new DCC standard to implement return messages from a train/ | ||
- | RailCom works by having the command-station/ | + | RailCom works by having the command-station/ |
- | RailCom/ | + | An example of RailCom Channel 1 detectors are shown here [[projects: |
+ | |||
+ | RailCom/ | ||
- | ===== RC filter ====== | + | ===== Raspberry Pi ===== |
+ | [[https:// | ||
+ | |||
+ | Two current models of single board computer running LINUX based system with several development environments... | ||
+ | |||
+ | Pi Zero (aka Pi0) | ||
+ | 1 GHz single-core CPU, 512 MB RAM, HDMI, USB and 40 pin GPIO (~ £4) | ||
+ | |||
+ | Pi 3 B (aka Pi3) | ||
+ | 1.2 GHz quad-core CPU, 1 GB RAM, Ethernet, Wireless, Bluetooth, HDMI, 4 x USB and 40 pin GPIO (~ £35) | ||
+ | |||
+ | |||
+ | ===== RC filter ====== | ||
A resistance and capacitor network to limit a particular frequency | A resistance and capacitor network to limit a particular frequency | ||
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===== Rectification ====== | ===== Rectification ====== | ||
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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 " | 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 " | ||
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===== Resistor ====== | ===== Resistor ====== | ||
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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 ' | 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 ' | ||
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===== Resonator ====== | ===== Resonator ====== | ||
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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 ====== | ||
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The Positive voltage goes to the Negative part of a circuit and vice versa. | The Positive voltage goes to the Negative part of a circuit and vice versa. | ||
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+ | |||
+ | ===== 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. | ||
===== RFID ===== | ===== RFID ===== | ||
+ | |||
**R**adio **F**requency **ID**entification\\ | **R**adio **F**requency **ID**entification\\ | ||
- | [[http:// | + | [[wp>/RFID|Wikipedia: RFID]]\\ |
[[glossary: | [[glossary: | ||
- | ===== Risk assessment ====== | + | **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# | ||
+ | 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. < | ||
+ | |||
+ | ===== 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. | ||
- | 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:// | + | |
+ | ===== RMS ====== | ||
+ | |||
+ | 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 ====== | ===== Road Vehicle Control ====== | ||
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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 ====== | ||
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This is used when you operate a set of instructions to drive a train from A>>> | This is used when you operate a set of instructions to drive a train from A>>> | ||
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===== RPC ====== | ===== RPC ====== | ||
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Remote Panel Control. RPC System - Remote Panel Interface ([[glossary: | Remote Panel Control. RPC System - Remote Panel Interface ([[glossary: | ||
- | ===== RPI ====== | ||
+ | |||
+ | ===== RPI ====== | ||
Remote Panel Interface. [[glossary: | Remote Panel Interface. [[glossary: | ||
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===== RS232 ====== | ===== RS232 ====== | ||
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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:// | + | [[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) | + | 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> |
===== RSA ====== | ===== RSA ====== | ||
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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 ====== | ||
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[[glossary: | [[glossary: | ||
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===== RTC ====== | ===== RTC ====== | ||
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Computer controller train controller from the [[glossary: | Computer controller train controller from the [[glossary: | ||
+ | |||
+ | |||
+ | ===== RTFM ===== | ||
+ | |||
+ | Read The Flipping Manual | ||
+ | |||
+ | |||
+ | ===== RTOS ===== | ||
+ | |||
+ | Real Time Operating System. |
glossary/glossary_r.txt · Last modified: 2023/12/11 11:06 by michael_smith