Mrbw Cst Manual V1.1

User Manual:

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Page Count: 28

ProtoThrottle

MANUAL

www.protothrottle.com

IOWA SCALED ENGINEERING – ELECTRONICS MADE EASY!

Thank you for purchasing the ProtoThrottle.

Our goal was to design and develop a wireless throttle

that provides the diesel modeler with the most realistic

experience operating their model locomotives.

The ProtoThrottle mimics a standard EMD control stand

including full detent throttle and reverser handles, a

spring-loaded horn handle, a push-on/push-off bell

button, and fully programmable front and rear head-

lights with a setting for ditch lights. In addition, the

ProtoThrottle comes with a robust faceplate machined

from aluminum, including prototype bezels, and anodized

to give the look and feel of a real control stand.

The ProtoThrottle comes with our commitment to your

satisfaction. We warranty the throttle from manufacturing

defects for one year, and if you should have any questions

or issues with the ProtoThrottle, please contact us.

Scott Thornton Michael Petersen Nathan Holmes

www.protothrottle.com

Table of Contents

ProtoThrottle Controls & Battery Install 4

Quick Start Guide 5

Main Screen 6

Engine Menu 7

Tonnage Menu 8

Load / Save Configuration Menus 9

Set Locomotive Menu 10

Force Function Menu 11

Configuration Function Menu 12

Notch Configuration Menu 14

Options Menu 15

System Menu 17

Communication Configuration Menu 18

Preferences Menu 19

Threshold Calibration Menu 21

Diagnostics Menu 22

Electronics Schematic 24

Licensing / Support 25

Open Source Development 26

Notes 27

Menu button

Auxiliary button

Status light

Select button

Bell button

Brake handle

(Note: to apply the brake

move the handle to the

right; all the way to the

right optionally applies

the emergency brake)

Rear lights switch

ProtoThrottle Controls & Battery Install

www.protothrottle.com

Up button

LCD screen

Horn handle

Down button

Throttle handle

Reverser handle

(Note: centered position allows

no directional movement; to

the right is forward; to the left

is reverse. You can remember

the prototypical directions by

referencing the lights below.

e.g.: “front” is forward, “rear”

is reverse. The directions can

be reversed, e.g. for consists,

see page 16 under Reverser

Swap.)

Front lights switch

Lanyard attachment

The ProtoThrottle is powered by 2 AA batteries (not included). The batteries can be

alkaline or rechargeable NiMH.

To access the battery holder, unscrew the 4 phillips head screws on the corners of

the throttle’s faceplate; remove the box; IMPORTANT: when removing the batteries

from the holder, use one hand to hold both sides of the holder to prevent it from

bending away from the printed circuit board; insert batteries and reattach the box.

Do not over tighten the screws.

To conserve battery life: make sure the throttle handle is in “idle” position and the

reverser handle is in “centered” position when not in use. This will cause the throttle

to go to sleep after 5 minutes.

Quick Start Guide

www.protothrottle.com

The ProtoThrottle will work with any scale and with sound- or non-sound

decoders (though using sound enhances the control stand experience signiﬁ-

cantly). Any DCC decoder compatible with the NMRA standards will work with

the ProtoThrottle because it uses standard DCC commands and functions via

your command station.. The ProtoThrottle is not a DCC system and will not

replace the system you use.

Check the Iowa Scaled Engineering website for the most current list of

supported DCC command stations: www.iascaled.com

1. Conﬁgure your ProtoThrottle receiver using the

instructions provided with the receiver.

2. Make sure the base address of the ProtoThrottle

matches that of the receiver. (See page 18.)

3. If using multiple ProtoThrottles, set each throttle

to a unique ID. (See page 18.)

Using your DCC system, set acceleration momentum

(CV3) mid-range to moderately high so that the

ProtoThrottle will need to “notch up” to get the train

moving.

Set deceleration momentum (CV4) high or maximum.

This will allow the train to “coast” when the throttle is in

the idle position requiring the use of the brake to slow or

stop the train.

Input the locomotive number into the ProtoThrottle:

NOTE: the ProtoThrottle function settings are set to standard DCC function numbers by default.

If you need to change any function number, the steps are explained below:

NOTE: if the ProtoThrottle is in

”sleep” mode the LCD screen will

be dark, click any of the LCD

buttons to wake the throttle.

To check or set the horn, bell, and brake function numbers:

Enjoy operating your locomotive!

SET

- LOCO

CONFIG

- FUNC

0003

HORN

F02

4003

HORN

F07

4003

4795

SAVED!

1. Click the Menu

button 5 times

1. Click the Menu

button 7 times

Please read the entire manual to familiarize yourself with all the

features of the ProtoThrottle. See our website for more speciﬁc

instructions on programming lights and our future tonnage feature.

In addition, our website has detailed operational scenarios

developed by professional locomotive engineer, Tim Garland.

If you are not familiar with prototype operation from a engineer’s

perspective, Tim’s scenarios will give you insight on how to

operate more realistically using the ProtoThrottle.

2. Click the Select

button once

2. Click the Select

button once

3. Use the Up and

Down buttons to

change numbers

NOTE: see page 10 for how

to set a short (primary) address.

3. Click the Up or

Down button to change

the function number

4. Use the Menu

button to move

cursor right

SAVED! 5. Click the Select

button to save all

changes

BRAKE

F10

4. Click Menu button to toggle through the other

function choices. Repeat step 3 to change

additional function numbers.

5. After number is

input, click Select

button to save

Main Screen

ELEMENT DESCRIPTION

0250

12:00







Locomotive Address. Long (extended) addresses are displayed directly

(e.g. 0250 0000 9999). Short (primary) addresses are displayed with

an ‘s’ prefix (e.g. s003 s000 s127).

In certain situations the locomotive address may be replaced by an alert

message:

EMRG Emergency stop is active!

Note: move the brake handle all the way left to deactivate.

REV! Reverser was moved with the throttle not in idle

The ProtoThrottle acts as a secondary display for Iowa Scaled

Engineering’s wireless fast clocks www.iascaled.com/store/MRBW-FCM

or the fast time provided by the NCE Cab Bus.

 12-hour mode AM indicator  12-hour mode PM indicator

No AM or PM indicator when in 24-hour mode.

Battery Status:  Batteries good  Batteries low  Replace batteries

Display will show LOW BATTERY when the batteries are critically low. Operation will not be possible

until the batteries are replaced.

When ”AX” is on screen the auxiliary button is active

Up/Down Button Status. On the main screen, the Up and Down

buttons can be assigned to functions. The on/off status of those

assigned functions are displayed on the LCD screen.

 Function off

 Function on

Note: pressing and holding the Menu button (upper left LCD button)

momentarily will return you to the main screen from any of the main

menus.

 0250 

12:00

www.protothrottle.com

LCD Screen

Advance to Engine Menu Up

Toggle backlight on/off;

hold to power down throttle

Down

NOTE: these buttons

can be assigned a

function using the

Conﬁgure Function

POWER

DOWN -~

Click “down button”

to turn off throttle

Engine Menu

DESCRIPTION

The behavior of the Engine menu depends on the configuration of the

ENG ON and ENG STOP settings in the Configure Function menu. For

DCC decoders that take a single function on/off to turn the prime mover

on/off (such as ESU Loksound or TCS WOWSound decoders), configure ENG

ON to that function number and set ENG STOP to off (F--). The Engine

menu will then change between OFF and ON when pressing the Up and

Down buttons.

If a decoder is edge triggered instead (requires a function on/off transition)

to turn the prime mover on and off (such as Soundtraxx Tsunami2), set

both ENG ON and ENG STOP to the appropriate function numbers.

In this case, the Engine menu will display STARTING and STOPPING be-

tween the ON and OFF settings as the assigned functions are sent to the

locomotive decoder.

If the throttle is not in idle when attempting to turn off the prime mover,

a warning will be displayed and the ENG STOP function will not be sent.

Move the throttle back to idle to continue.

Example #1, F8 for ESU Loksound or F12 for TCS WOWSound:

ENG ON = F08 ENG ON = F12

ENG STOP = F-- ENG STOP = F--

Example #2, F5 (on, RPM+) and F6 (off, RPM-) for Soundtraxx Tsunami 2:

ENG ON = F05

ENG STOP = F06

LCD Screen

Advance to Tonnage Menu Start or turn on prime mover

Return to Main Screen Stop or turn off prime mover

ENGINE

OFF

ENGINE

OFF

ENGINE

OFF

ENGINE

STARTING

ENGINE

STOPPING

ENGINE

OFF

www.protothrottle.com

ENGINE

NOT IDLE

Tonnage Menu

LCD Screen

Advance to Load Conﬁguration Menu Increase tonnage value

Return to Main Screen Decrease tonnage value

LIGHT

ENGINE

LOW

WEIGHT

MEDIUM

WEIGHT

HEAVY

WEIGHT













www.protothrottle.com

Note: the tonnage feature is a future release.

Watch our website for updates.

Load / Save Conﬁguration Menus

LCD Screen

LOAD CNF: Advance to SAVE CNF

SAVE CNF: Advance to Set

Locomotive Menu

Increase conﬁguration number

Load selected conﬁguration

(and return to Main Screen) or

Save current conﬁguration

(and return to Main Screen)

Decrease conﬁguration number

LOAD CNF

01: 0250

SAVE CNF

01: 0250

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Load / Save Conﬁguration Sub-Menu

01: Configuration Number. Up to 20 distinct configurations (locomotive

address, function mappings, throttle notch settings, options) can be

stored in the ProtoThrottle and loaded quickly using this menu.

0250 Locomotive Address. This is the locomotive address associated

with the selected conﬁguration number.

Save Conﬁguration screen saves the current loaded conﬁguration

(with any changes you’ve made) into whatever conﬁguration slot is on

the screen. In order to copy an established conﬁguration, you must load

it into the throttle ﬁrst before “saving” it to another slot.

Both the Load Conﬁguration and Save Conﬁguration functions will

ask you to conﬁrm before executing by pressing the Down button.

To cancel, click the Menu button.

LOAD CNF

01: 0250

LOAD CNF

01: 0250

CURRENT

CONFIG

CONFIGS

1-20

SAVE CNF

01: 0250

ELEMENT DESCRIPTION

SAVE CNF

01: 0250

CONFIRM

LOAD? -~

CONFIRM

SAVE? -~ Load conﬁguration

Save conﬁguration

Set Locomotive Menu

Set Locomotive Sub-Menu

ELEMENT DESCRIPTION

0250

Locomotive Address.

Digit Selector.

LCD Screen

Move Digit Selector to the next digit Increase selected digit.

Save locomotive address and return to

Set Locomotive Menu

Decrease selected digit.

NOTE: To set a short (primary)

address, press the decrease button

once more when the ﬁrst digit is zero.

You will see an “s” which indicates

“short”. Move the digit selector

to enter the remaining numbers.

For example, a single digit address

would be entered “s003”, a two digit

address “s025”, etc.

LCD Screen

Advance to Force Function Menu None

Enter Set Locomotive Sub-Menu None

SET

- LOCO

www.protothrottle.com

0250

Force Function Menu

Force Function Sub-Menu

ELEMENT DESCRIPTION

F00

---

Function Number. Available range from function 0 to function 28.

Function Setting.

--- Function can be controlled by a ProtoThrottle button or lever

ON Function forced on, regardless of any other button or control

OFF Function forced off, regardless of any other button or control

LCD Screen

Cycle through Function Numbers Cycle through Function Settings

Save function settings and return to

Force Function Menu

Cycle through Function Settings

LCD Screen

Advance to Conﬁgure Function Menu None

Enter Force Function Sub-Menu None

FORCE

- FUNC

www.protothrottle.com

F00 ---

NOTE: The Force Function menu allows any of the 29 standard DCC functions to be turned

ON or OFF, regardless of any other ProtoThrottle lever or button. These can be used to test

functions or control additional features of the decoder such as auxiliary, class, or lesser used

lights.

Conﬁgure Function Menu

Conﬁgure Function Sub-Menu

ELEMENT DESCRIPTION

HORN

F00

Control Name. The name of the ProtoThrottle button or handle to which

a function can be assigned.

HORN Horn lever

BELL Bell button

BRAKE Brake lever, when brake is activated

BRK OFF Brake lever, when in the full left position

AUX Aux button

ENG ON Prime mover ON/start function (see Engine menu for details)

ENG STOP Prime mover stop function (see Engine menu for details)

THR UNLK Function which, when active due to another control, allows

the throttle to send speed commands when the reverser is in centered

position. (e.g. Loksound Drive Hold)

REV SWAP Function which, when active due to another control, flips the

direction of the reverser

F.HEAD Front headlight; active in the Bright and Ditch Lights settings

F.DITCH Front ditch lights; active in the Ditch Lights setting

F.DIM #1 Front dim headlight function #1; active in the Dim setting

F.DIM #2 Front dim headlight function #2; active in the Dim setting

R.HEAD Rear headlight; active in the Bright and Ditch Lights settings

R.DITCH Rear ditch lights; active in the Ditch Lights setting

R.DIM #1 Rear dim headlight function #1; active in the Dim setting

R.DIM #2 Rear dim headlight function #2; active in the Dim setting

UP BTN Main screen Up button

DOWN BTN Main screen Down button

Function Number. The function to be activated when the associated

ProtoThrottle button is pressed or control is moved. Available settings

are none (F--) and functions 0 (F00) to 28 (F28).

Continued on next page

LCD Screen

Advance to Notch Conﬁguration Menu Up

Enter Conﬁgure Function Sub-Menu Down

CONFIG

- FUNC

HORN

F02

www.protothrottle.com

LCD Screen

Cycle through Control Names Increase Function Number

Save function settings and return to

Conﬁgure Function Menu

Decrease Function Number.

Pressing this button when the

Function Number equals zero

turns the function off – no function

will be activated when the control

is operated.

www.protothrottle.com

Conﬁgure Function Sub-Menu

UP BTN

F00 MOM

Continued from previous page

MOM Momentary / Latching Function. Only appears for the Up and

Down button assignments.

MOM Momentary – the function is only active while the button is pressed

LAT Latching – the function toggles on and off with each press of the

button

Notch Conﬁguration Menu

Notch Conﬁguration Sub-Menu

ELEMENT DESCRIPTION

102

Notch Number.

Speed Step. The speed step to send when the throttle is in the selected

Notch Number. Range from 1 to 126 (128 speed step mode only). Idle is

always speed step zero.

LCD Screen

Advance to Options Menu None

Enter Notch Conﬁguration Sub-Menu None

NOTCH

- CFG

NOTCH #

102

LCD Screen

Cycle through Notch Numbers Increase Speed Step

Save notch settings and return to

Notch Conﬁguration Menu

Decrease Speed Step

www.protothrottle.com

Options Menu

Options Sub-Menu

ELEMENT DESCRIPTION

Variable Brake. When set to ON, the brake effect will be proportional to

the brake handle position. It is recommended to disable the emergency

brake when variable braking is enabled. When set to OFF, the brake will

be a simple on/off function.

Brake type:

 PULSE braking

 STEP braking (works with TCS WOWSound function)

Pulse braking. The brake function will be pulsed at a duty cycle cor-

responding to the brake handle position, simulating varying amounts of

braking force.

Step braking. This feature is for use with TCS WOWSound decoders

only. As the brake handle is moved to the right, a greater percentage of

the brake is applied.

NOTE: the only way to disengage the brake is to fully release the brake

handle completely to the left. Also, the emergency brake feature must

be disabled for step braking to work correctly.

Continued on next page

LCD Screen

Advance to Threshold Calibration Menu None

Enter Options Sub-Menu None

OPTIONS

-

VAR BRK

www.protothrottle.com

VAR BRK

OFF

BRK TYPE

PULSE

Brake released

To disengage brake, handle must be

fully released to the left.

20%

40%

60%

80%

100%

Brake fully

applied

NOTE: Only displayed

if variable brake is ON

LCD Screen

Cycle through Options Increase or set option value

Save setting and return

to Options Menu

Decrease or set option value

Options Sub-Menu

Continued from previous page

ELEMENT DESCRIPTION

Brake Pulse Rate

This sets the rate (0.2-1.0 second) at which brake commands are sent

during pulse braking. A smaller value results in smoother braking but can

result in a less responsive DCC system due to more commands being

sent on the throttle bus.

E-Stop on Brake Handle. When set to ON, the brake handle can set

emergency stop for the selected locomotive when moved completely

to the right. When set to OFF, the brake handle will not cause an

emergency stop to be set.

Reverser Swap. When set to ON, the reverser directions are swapped.

This can be used to correct for a locomotive whose direction is set

incorrectly or when changing the leading end of a back-to-back consist.

When set to OFF, the reverser directions are normal.

REV SWAP

OFF

BRK ESTP

BRK RATE

0.5s

www.protothrottle.com

NOTE: Only displayed

if variable brake is

ON and brake type

is PULSE

www.protothrottle.com

System Menu

Options Sub-Menu

ELEMENT DESCRIPTION

When set to ON, only the following menus are available:

ENGINE, TONNAGE, LOAD CNF, SET LOCO, FORCE FUNC, and

SYSTEM.

When set to ON, advanced functions in the throttle are enabled. These

include the Threshold Calibration menu and the Transmit Interval and

Transmit Holdoff settings in the Preferences menu.

Battery OK Voltage. The voltage above which the

batteries are considered good. 

Battery Warning Voltage. The batteries are low when the

voltage is between the OK and Warning levels. 

The batteries need to be replaced when the voltage is between

the Warning and Critical levels. 

NOTE: When the voltage falls below the Critical level, LOW BATTERY

will be displayed and operation of the throttle will not be possible.

LCD Screen

Advance to Communication

Conﬁguration Menu

None

Enter System Sub-Menu None

SYSTEM

-

MENU LCK

ADV FUNC

OFF

MENU LCK

OFF

BAT OKAY

2.2V

BAT WARN

2.0V

BAT CRIT

1.8V

Advance to Diagnostics Menu

Communication Conﬁguration Menu

Communication Conﬁguration Sub-Menu

ELEMENT DESCRIPTION

Throttle ID. Set each throttle to a unique ID using letters A-Z

Base Address. Set to the address of the ProtoThrottle receiver –

see reciever instructions.

Time Source Address. Selects the fast time source. Set to “BASE”

to display time information received from the command station

by the ProtoThrottle receiver. To use an Iowa Scaled Engineering

Wireless Fast Clock Master, set to the Node Address of the clock

(0x01 to 0xFE). Set to “ALL” to display any time information

received by the ProtoThrottle. The “ALL” setting works well with

a single receiver in a private setting, but may result in erratic time

display when multiple ProtoThrottle receivers are in close proximity

(e.g. a public train show).

LCD Screen

Advance to Preferences Menu None

Enter Communication

Conﬁguration Sub-Menu

None

COMM

- CFG

THRTL ID

LCD Screen

Cycle through Address/ID Names Increase

Save Address/ID settings and return to

Communication Conﬁguration Menu

Decrease

www.protothrottle.com

THRTL ID

BASE ADR

TIME ADR

BASE

Preferences Menu

Preferences Sub-Menu

ELEMENT DESCRIPTION

Sleep Delay. Time until the throttle automatically enters low power

mode. The throttle handle must be in idle, the reverser handle in

centered position, and no buttons or controls actuated for this time.

Range from 1 to 99 minutes.

Clock Timeout. Maximum time between fast clock time packets. If no

time information is received in this interval, the clock display will show

dashes to indicate it has lost communication with the fast clock master.

Range from 1 to 25 seconds.

Transmit Interval. Time between periodic wireless transmissions to the

ProtoThrottle receiver. This setting can only be changed if Advanced

Functions are ON in the SYSTEM menu.

Transmit Holdoff. Minimum time between wireless transmissions to the

ProtoThrottle receiver. This setting can only be changed if Advanced

Functions are ON in the SYSTEM menu.

LED Blink. When set to ON, the LED on the ProtoThrottle will blink

green when communication with a ProtoThrottle receiver is active.

When set to OFF, the LED will remain off when communication is active.

The LED will always blink red when no communication link has been

established.

Continued on next page

LCD Screen

Advance to Diagnostics Menu None

Enter Preferences Sub-Menu None

PREFS

- CFG

SLEEP

DLY: 5M

TIMEOUT

CLK: 10s

TX INTVL

TX HLDOF

0.15s

www.protothrottle.com

LED BLNK

LCD Screen

Cycle through preference settings Increase value or turn on setting

Save preference settings and

return to Preferences Menu

Decrease value or turn off setting

www.protothrottle.com

Preferences Sub-Menu

Continued from previous page

ELEMENT DESCRIPTION

Reverser Lock. When set to ON, the reverser can only change the

locomotive direction when then throttle is in idle, just like the prototype

(in fact, on the prototype, the reverser handle is locked and cannot be

moved). If the reverser is moved when the throttle is not in idle, the

direction will remain the same and the Main Screen will display REV!.

When set to OFF, the reverser is allowed to change the locomotive

direction regardless of the throttle setting.

REV LOCK

Threshold Calibration Menu

Threshold Calibration Sub-Menu

ELEMENT DESCRIPTION

NAME



240

Control Name. The name of the ProtoThrottle control to be calibrated.

Hold the control in the desired location and press the Up button to set

the new calibration value.

HORN Threshold for the horn function activation

BRAKE Threshold for the brake function activation

BRAKE LOW Left brake handle stop

BRAKE HIGH Right brake handle stop; also threshold for emergency stop

Control Status. Shows the on/off status of the selected control.

 OFF

 ON

Internal ADC value for the selected control. Can normally be ignored,

unless you’re developing code for the ProtoThrottle or are just a nerd.

LCD Screen

Advance to Communication Conﬁguration None

Enter Threshold Calibration Sub-Menu None

THRSHOLD

- CAL

HORN 

240

LCD Screen

Cycle through Control Names Set new calibration value

Save threshold settings and return to

Threshold Calibration Menu

None

www.protothrottle.com

NOTE: These settings are

factory calibrated and do not,

under most circumstances,

need to be changed.

Modify them at your own risk!

NOTE: Only displayed if Advanced Functions

are ON in the SYSTEM menu

Diagnostics Menu

Diagnostics Sub-Menu

ELEMENT DESCRIPTION

Controls Display. Shows the current status of the ProtoThrottle controls

and buttons. Pressing the up/down buttons will toggle through the

current DCC function status.

Sleep Timeout. Shows the number of seconds until the throttle goes to

sleep.

Packet Timeout. Timer reset by each packet received from the

ProtoThrottle receiver. Communication is considered lost when the bar

reaches zero.

Received Signal Strength Indicator. Reports the strength of the

wireless connection to the throttle.

Fast Time Ratio. Reports the fast time ratio from the last update received.

Battery Voltage

ProtoThrottle Firmware Version

ProtoThrottle Firmware Short Git Hash

Continued on next page

LCD Screen

Return to Main Menu None

Enter Diagnostics Sub-Menu None

DIAGS

- CFG

 0% I N

-  -

SLEEP

300 sec

PKT TIME

[ÿÿÿÿ]

BATTERY

2.30V

FT RATIO

2.4:1

RSSI

-43dBm

VERSION

1.1.0

GIT REV

000000

www.protothrottle.com

Diagnostics Sub-Menu

ELEMENT DESCRIPTION

Base Type. The type of ProtoThrottle receiver to which the ProtoThrottle

is connected.

Base Unit Short Git Hash

Factory Reset. Press the Down button 5 times to reset the

ProtoThrottle to factory settings. WARNING: This will erase all

configuration settings, except those in the Threshold Calibration

menu, so use with caution!

BASE TYP

CAB BUS

BASE REV

000000

FACTORY

RESET 5~

LCD Screen

Cycle through diagnostics settings None

Return to Diagnostics Menu None

www.protothrottle.com

VBAT

GND

ICSP Header

1uF

16V

Control Stand Throttle

mrbw−cst.sch

1 1 Michael Petersen

FILE: REVISION:

DRAWN BY: PAGE OF

TITLE

1234567891011

123456789101112 13 14 15 16 17

12 13 14 15 16 17

H1 H2 H3 H4

22pF

16V, NP0

SOFTKEY1

1VCC

2DOUT

3DIN

4DO8

5RESET

6PWM0/RSSI

7PWM1

8N.C.

9DTR/SLEEP_RQ

10 GND 11

DIO4

CTS

ON/SLEEP

VREF

ASSOC

RTS

DIO3

DIO2

DIO1

DIO0

XBEE / XBEE−PRO

XU3

VBATSNS

1 2

3 4

5 6

MISO

SCK

RST

MOSI

GND

C11

8.2pF

16V, NP0

C10

1uF

16V

Notes:

1) All capacitors are ceramic (X7R/X5R) unless otherwise noted.

2) All capacitors and resistors are 0805 unless otherwise noted.

22pF

16V, NP0

0.1uF

16V

0.1uF

16V

499k

287k

33pF

16V

1SHDN

VOUT

3PGOOD

8VIN

SGND

PGND

GND

LTC3528

LTC_DDB8

MSS6132−472

4.7uH

10uF

6.3V

10uF

6.3V

10k

1 2

SW2

PVA1 EE H2 1.2NV2

1 2

SW3

PVA1 EE H2 1.2NV2

Note: Latching pushbuttons.

Turn off pull−up when not polling.

BELL

DYNAMIC

SW4

25LB10−Q

Throttle

SW5

25LB30−Q

Reverser

VREV

5 4

100k

8 1

100k

REV_EN

VREV

Reverser Decode:

A/B=off/off, C=0V

A/B=on/off, C=1.65V

A/B=off/on, C=1.1V

A/B=on/on, C=1.98V

THRA

THRB

THR_EN

Must read continuously.

THR_EN only used in sleep.

VLIGHT_F

LIGHT_EN

VLIGHT_F

VLIGHT_R

THRA

THRB

THR_EN

VBATSNS

PTV09A−2020F−B104

100k

VBRAKE

POTS_EN

VBRAKE

POTS_EN

LIGHT_EN

VREV

VLIGHT_F

VBRAKE

THRA

REV_EN

Reset

XTAL2

XTAL1

AREF

16 PD7 (OC2)

15 PD6 (ICP)

14 PD5 (OC1A)

13 PD4 (OC1B)

12 PD3 (TXD1/INT1)

11 PD2 (RXD1/INT0)

10 PD1 (TXD0)

9PD0 (RXD0)

3PB7 (SCK)

2PB6 (MISO)

1PB5 (MOSI)

44 PB4 (SS)

43 PB3 (AIN1)

42 PB2 (AIN0)

41 PB1 (T1)

40 PB0 (T0)

(TOSC2) PC7

(TOSC1) PC6

PC5

PC4

PC3

PC2

(SDA) PC1

(SCL) PC0

(ADC7) PA7

(ADC6) PA6

(ADC5) PA5

(ADC4) PA4

(ADC3) PA3

(ADC2) PA2

(ADC1) PA1

(ADC0) PA0

GND

VCC

AVCC

ATmega1284P

TQFP44

+3.3V

0.1uF

16V

+3.3V

LCD_EN

SLEEP_EN

BELL

DYNAMIC

BACKLIGHT_EN

10k

SOFTKEY2

SOFTKEY0

SOFTKEY3

+3.3V

LCD_EN

100k

MP1

DMP2240UDM

D34

COM5

D46

D2 3

COM 2

D1 1

U4CPDT6−5V4−HF

D34

COM5

D46

D2 3

COM 2

D1 1

U6CPDT6−5V4−HF

D34

COM5

D46

D2 3

COM 2

D1 1

U5CPDT6−5V4−HF

100k

6 3

100k

SOFTKEY0

SOFTKEY1

VSS (GND)

VDD (VCC)

R/W

SW0

SW1

SW2

SW3

DB4

DB5

DB6

DB7

LCD

9LEDG

10 LEDR

SOFTKEY2

SOFTKEY3

BACKLIGHT_EN

MN1

BSS138

LEDG

LEDR

LEDG

LEDR

100k

R10

8 1

100k

5 4

100k

7 2

100k

6 3

100k

THRB

VBAT

VHORN

VLIGHT_R

YELLOW

RED

4 1

R11 1k

3 2

R11 1k

JP1

1 3

2 4

11.0592MHz

PTV09A−2020F−B104

100k

VHORN

POTS_EN

SLEEP_EN

VHORN

VBAT

Charger

LIGHT_EN

POTS_EN

MP1

DMP2240UDM

5 4

100k

R10

7 2

100k

R10

100k

R10

VLIGHT_R

SW6

KC14

SW7

KC14

C12

DNI

C13

DNI

TP1

www.protothrottle.com

Open Design

Iowa Scaled Engineering is committed to creating open designs that

users are free to build, modify, adapt, improve, and share with others.

Hardware

The design of the ProtoThrottle hardware is open source hardware,

and is made available under the terms of the Creative Commons

Attribution-Share Alike v3.0 license, a copy of which is available from:

http://creativecommons.org/licenses/by-sa/3.0/

Design files can be found on the Iowa Scaled Engineering’s Github site:

https://github.com/IowaScaledEngineering/mrbw-cst

Firmware

The official Iowa Scaled Engineering firmware for the ProtoThrottle is

free software: you can redistribute it and/or modify it under the terms

of the GNU General Public License as published by the Free Software

Foundation, either version 3 of the License, or (at your option) any

later version. A copy of the GNU GPL can be found at:

http://www.gnu.org/licenses/gpl.html

New firmware can be flashed into the ProtoThrottle through J2.

The six pins are a standard AVR 6-pin ISCP programmer connection.

We encourage you to join the ProtoThrottle group forum:

https://groups.io/g/ProtoThrottle

The forum will help with general and technical

questions regarding the ProtoThrottle.

Visit the Iowa Scaled Engineering website

to learn more about our full line of

model railroad electronics.

www.iascaled.com

support@iascaled.com

Manual 1.1 (updated version)

www.protothrottle.com

ProtoThrottle

Model: MRBW-CST

HW Version: 1.2

Iowa Scaled Engineering, LLC

22750 County Road 37

Elbert, CO 80106

support@iascaled.com

Contains FCC ID: OUR-XBEEPRO

This device complies with part 15 of the FCC Rules. Operation is subject to the following

two conditions: (1) This device may not cause harmful interference, and (2) this device

must accept any interference received, including interference that may cause undesired

operation.

Note: This equipment has been tested and found to comply with the limits for a Class B

digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide

reasonable protection against harmful interference in a residential installation. This equip-

ment generates, uses and can radiate radio frequency energy and, if not installed and

used in accordance with the instructions, may cause harmful interference to radio

communications. However, there is no guarantee that interference will not occur in

a particular installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment off and on,

the user is encouraged to try to correct the interference by one or more of the following

measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that

to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

Changes or modification to the device could void the user’s authority to operate the

equipment.

Contains Model XBee-PRO Radio, IC: 4214A-XBEEPRO

This device complies with Industry Canada’s licence-exempt RSSs. Operation is subject to

the following two conditions:

(1) This device may not cause interference; and

(2) This device must accept any interference, including interference that may

cause undesired operation of the device.

Cet appareil est conforme aux RSS exempts de licence d’Industrie Canada. L’opération est

soumise aux deux conditions suivantes:

(1) Cet appareil ne doit pas causer d’interférences; et

(2) Cet appareil doit accepter toute interférence, y compris les interférences susceptibles

de provoquer un fonctionnement indésirable de l’appareil.

Changes or modification to the device could void the user’s

authority to operate the equipment.

Des changements ou des modifications à l’appareil pourraient

annuler l’autorité de l’utilisateur à utiliser l’équipement.

Notes

www.protothrottle.com

IOWA SCALED ENGINEERING – ELECTRONICS MADE EASY!

Mrbw Cst Manual V1.1

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