Model Railroad System
2.2.1
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Switch (turnout) operation using 1/2 of a SR4. More...
Public Member Functions | |
SR4_MRD2_Switch (name,...) | |
Constructor: initialize the switch object. More... | |
occupiedp () | |
The occupiedp method returns yes or no (true or false) indicating block (OS) occupation. More... | |
pointstate () | |
The pointstate method returns normal if the points are aligned to the main route and reverse if the points are aligned to the divergent route. More... | |
motor (route) | |
The motor method sets the switch motor to align the points for the specificed route. More... | |
propagate (aspect, from,...) | |
Method used to propagate distant signal states back down the line. More... | |
Static Public Member Functions | |
static | validate (object) |
Type validating code Raises an error if object is not either the empty string or a SR4_MRD2_Switch type. More... | |
Protected Member Functions | |
_entering () | |
Code to run when just entering the OS Sets the signal aspects and propagates signal state. More... | |
_exiting () | |
Code to run when about to exit the OS. More... | |
Private Member Functions | |
_settruedirection (option, value) | |
A method to fake direction for frog facing switches. More... | |
_gettruedirection (option) | |
A method to fake direction for frog facing switches. More... | |
Private Attributes | |
motor | |
Motor device (SR4 outputs) More... | |
pointsense | |
Point sense device (SR4 inputs) More... | |
ossensor | |
Occupency sensor (MRD2) More... | |
forwardsignal | |
Signal at the points. More... | |
reversemainsignal | |
Signal at the straight frog end. More... | |
reversedivergentsignal | |
Signal at the divergent frog end. More... | |
Static Private Attributes | |
static | _routes |
Route check validation object. More... | |
Switch (turnout) operation using 1/2 of a SR4.
Above is a typical switch (turnout) using an Azatrax SR4 to control a Circuitron Tortoise Switch Machine and to sense the point position and an Azatrax MRD2 to sense occupation of the switch. (A high resolution PDF and a Xtrkcad layout file are included.)
Typical usage:
For the track work elements use "switchN occupiedp" for the track work elements' occupied script and use "switchN pointstate" for the track work elements' state script. For the switch plate use "switchN motor normal" for the normal script and "switchN motor reverse" for the reverse script.
Then in the Main Loop, you would have:
Definition at line 53 of file SR4_MRD2_Switch.tcl.
SR4_MRD2_Switch::SR4_MRD2_Switch | ( | name | , |
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Constructor: initialize the switch object.
Create a low level sensor object and install it as a component. Install the switch's signals, motor, and point sense objects.
name | Name of the switch object |
... | Options:
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protected |
Code to run when just entering the OS Sets the signal aspects and propagates signal state.
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protected |
Code to run when about to exit the OS.
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private |
A method to fake direction for frog facing switches.
option | This is always -direction. |
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private |
A method to fake direction for frog facing switches.
option | This is always -direction. |
value | Either forward or reverse. |
SR4_MRD2_Switch::motor | ( | route | ) |
The motor method sets the switch motor to align the points for the specificed route.
route | The desired route. A value of normal means align the points to the main (straight) route and a value of reverse means align the points to the divergent route. |
SR4_MRD2_Switch::occupiedp | ( | ) |
The occupiedp method returns yes or no (true or false) indicating block (OS) occupation.
SR4_MRD2_Switch::pointstate | ( | ) |
The pointstate method returns normal if the points are aligned to the main route and reverse if the points are aligned to the divergent route.
If the state cannot be determined, a value of unknown is returned.
SR4_MRD2_Switch::propagate | ( | aspect | , |
from | , | ||
... | |||
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Method used to propagate distant signal states back down the line.
aspect | The signal aspect that is being propagated. |
from | The propagating block. |
... | Options:
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static |
Type validating code Raises an error if object is not either the empty string or a SR4_MRD2_Switch type.
object | Some object. |
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staticprivate |
Route check validation object.
Definition at line 169 of file SR4_MRD2_Switch.tcl.
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Signal at the points.
Definition at line 85 of file SR4_MRD2_Switch.tcl.
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Motor device (SR4 outputs)
Definition at line 73 of file SR4_MRD2_Switch.tcl.
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Occupency sensor (MRD2)
Definition at line 81 of file SR4_MRD2_Switch.tcl.
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Point sense device (SR4 inputs)
Definition at line 77 of file SR4_MRD2_Switch.tcl.
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private |
Signal at the divergent frog end.
Definition at line 93 of file SR4_MRD2_Switch.tcl.
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Signal at the straight frog end.
Definition at line 89 of file SR4_MRD2_Switch.tcl.