The MR001d receiver is well suited for use in large scale live-steam or large scale battery powered locos. It operates on 2.4GHz using the Spektrum DSM2 or DSMX protocols; thus it operates just like any other DSM2/DSMX receiver but includes some useful features for model railway control. The MR001d is small (30x18x11mm) and space for it is easily found in most locos.

The MR001d free-air range, when used with a Micron low-power transmitter, is 50m-60m and approximately 200m when used with a full-power (100mW) transmitter. This range will be reduced indoors due to absorption by furniture / fittings and reflections from metal surfaces. Range is also reduced if the receiver aerial is in a metal enclosure. Ideally, the aerial should be placed outside the vehicle body and clear of any metal. The active tip of the extended aerial needs to 'see' the transmitter so should be placed through a hole in the vehicle body - e.g. into the cab space. The receiver aerial should not be cut short or made longer as this will affect operation of the receiver. It is important to perform a range check after installation to ensure you have full control of your loco/vehicle at all positions around the layout.

Features (top)

• Compatible with all DSM2 and DSMX transmitters with up to 10 R/C channels, both Micron model rail and aero model stick type transmitters.
• 3.45V to 8.5V working voltage range.
• 11 outputs which can be configured for servo/ESC or 0V/3.3V low-current switched ports; 7 ports are at the front with 'standard' 0.1" pitch connector pins, ports 8 to 11 are on an optional JST-SH connector at the rear.
• Supports the Selecta feature for compatibility with multi-loco transmitters, the receiver must be re-bound to change Selecta switch position.
• The default configuration provides auto-switched front and rear LED lights on P6 and P7 controlled by the throttle channel.
• Receiver on-board LED can be repeated to any non-servo output (this is called the LED2 function).
• All functionality may be configured by programming using a a suitable transmitter (most Micron tx or a stick type model aircraft tx).

---

Connections and Indicators

MR001d has 7 set of JR style 0.1" pitch output pins, labeled P1 to P7 on the diagram below. Ports P8 to P11 are on the optional JST-SH connectors at the aerial end of the receiver. Although the JST-SH socket has 3.3V power, this is insufficient for powering a servo which must use an external regulator or by power directly from the battery.

MR001d can be powered from a battery of 3.45V up to 8V; use of a 4 or 5 cell NiMH rechargeable battery or the 5V regulated output from a speed controller is typical.

MR001d contains 4 configurations which can be selected using a Power-On Configuration Changes or by programming the receiver. The default configuration has servo outputs on P1 to P5, front/rear lighting on P6 and P7, and switched outputs on P8 to P11 - see the Configurations table at the end of this document. Other output configurations are available on request.

MR001d has a LED indicator on the top side to show receiver status:

• immediately after switch on, flashes slowly while waiting for a good transmitter signal
• if no transmitter signal found after 5 seconds, the LED flashes rapidly to indicate bind mode
• lights continously when good R/C data is being decoded
• flashes twice, pause and repeat when the receiver is deselected (see Selecta)
• used for feedback when programming; feedback flash patterns comprise a repeated number of flashes followed by a 1 second pause - this is called a N-flash where N is the number of flashes, e.g. 3-flash is 3 short flashes, 1 second pause and repeat

---

Live Steam

For live-steam use, MR001d outputs can be connected to standard R/C servos to operate the regulator, reverser, blower, gas valve and whistle. MR001d will work with any servo that uses a standard (1ms - 2ms) pulse width control signal and operates off the selected battery voltage - e.g. Emax ES08MDII.

The throttle mode should be set to low-off for separate regulator and direction controls and to ensure that Emergency Stop (if configured) will close the regulator.

When used with a Micron model rail transmitter, throttle is on P1/ch1 controlled using the large speed knob and direction is on P3/ch3 controlled using the toggle switch (or direction control knob on Tx24 variants). The Micron transmitter should ideally be configured for low-off throttle with no centre detent and a non-biased direction toggle switch. When used with an aeromodel type stick transmitter, throttle is controlled using the throttle stick and direction is controlled by the elevator stick. Servos, plugged into MR001d P1 and P3, are linked to the regulator and reverser. The battery can be connected, via an on/off switch, into any of the unused pins.

---

Battery Powered Loco

An Electronic Speed Controller (ESC) that supports forward and reverse should be connected to P1/ch1 as shown in the diagram. The MR001d is powered from the ESC 5V output.

The throttle mode should be set to centre-off or low-to-centre - the latter allows use of a centre-off ESC while providing separate transmitter speed and direction controls.

A resettable fuse is essential to protect the battery in the event of a ESC or wiring fault. The switch must be capable of carrying the maximum motor current; if a suitable mechanical switch cannot be found, an electronic switch should be used instead (contact Micron for details).

Any of the Micron model rail transmitters can be used or a Spektrum compatible stick type transmitter. Tx21v2, Tx22v2 and Tx24v2 transmitters have an inertia control which gives a more realistic acceleration and deceleration by slowing down the rate at which the throttle channel is changed.

---

Binding (top)

MR001d must be bound to a transmitter before use. Once bound, the receiver remembers the transmitter identity and searches for this when it is switched on.

To bind a receiver, it is switched on with no transmitter active (for normal operation, the transmitter should be switched on before the receiver).

MR001d enters autobind approximately 5 seconds after switching on if it fails to find a previously bound transmitter signal. Binding may also be initiated manually by connecting the large jumper plug across P5 and P7 signal pins (top) row.

Bind mode is indicated by a rapid flashing of the receiver LED and the following steps should be followed to bind with your transmitter:

1. transmitter switched off
2. if Selecta is enabled, move the transmitter loco selection switch to the required position
3. switch on the receiver in bind mode (manual or auto)
4. only when the LED is flashing rapidly, hold down the transmitter bind button and switch on
5. wait for the transmitter to indicate that it is in bind mode and then release its bind button (the power LED on Micron model rail transmitters will flash when binding)
6. after a short delay, the LED should return to a slow flash and 2-5 seconds, will light and stay on
7. the receiver is now bound to the transmitter

If the LED does not come on solid (no flash) within 10-15 seconds, the bind process has failed. This can happen for several reasons and does not normally indicate a fault. During binding, the receiver searches for the transmitter's signal and this can be distorted by holding the transmitter and receiver too close. So, if you get a bind fail, try again after moving them slightly further apart or changing the relative orientation of the aerials. Binding is most reliable when no other 2.4GHz transmitters are turned on.

---

Throttle Mode (top)

The MR001d throttle mode determines how transmitter controls affect receiver outputs, the behaviour of Directional Lights and what happens if Emergency Stop is triggered or Cruise Control is disabled and signal is lost.

The throttle mode can be set using a Power-On Change using the large jumper plug on pins P3 and P5 or by programming. The modes are:

centre-off (1-flash)

Forward and reverse on one transmitter control with stop in the centre. Best used with an external forward/reverse speed controller. This is the default mode and receivers will be supplied centre-off unless otherwise requested.

low-off (2-flash)

Separate transmitter controls for speed and direction which are output on separate MR001d ports. This is the mode used for most live steam locos.

low-to-centre (3-flash)

Separate speed and direction transmitter controls are combined into one forward/reverse output. This mode is intended for battery electric locos where the user prefers separate controls or who wants to use a transmitter for both live steam and battery locos.

This mode requires the maximum low and high throttle control positions to be calibrated. Calibration is forced the first time a receiver is switched on in this mode. The LED will emit a repeated flash pattern comprising one long flash followed by 1 or 2 short flashes:

1-flash

move the throttle to the minimum position (stop) and then move toward full throttle; as the control passes through the centre position, the flash pattern changes to ...

2-flash

move the throttle to the max position (full throttle) and then move back toward the centre; as the control passes through the centre position, the LED will light continously to show that calibration is complete.

The throttle can be re-calibrated at any time by re-selecting low-to-centre mode using the large jumper plug or by programming.

In all modes, the throttle output (P1) will not change until the transmitter control has been set to minimum throttle. This is to prevent the loco moving immediately the receiver is switched on.

---

Loco Selection - Selecta (top)

Many Micron model rail transmitters have a 12 way switch to allow control of up to 12 locos - Deltang originated this feature and called it 'Selecta'. Using the switch, locos are brought under control one at a time. When not selected, receiver outputs hold their current setting (e.g. a loco which is moving when deselected keeps moving) and the LED shows a 2-flash pattern. The default 'keep going' behaviour can be changed to stop when deselected by programming the receiver.

The Micron implementation of Loco Selection / Selecta is fully compatible with the Deltang Selecta feature and uses R/C channel 2 by default. When Selecta is enabled, the controlling R/C channel (e.g. 2) may still be mapped to a receiver output but, of course, this will not change as the transmitter switch is rotated.

The receiver has a 800ms delay before enabling when the transmitter Selecta value is changed. This is to avoid obeying the transmitter while the Selecta switch is being moved - e.g. a receiver on Selecta #4 should not change any outputs while the transmitter Selecta switch is moved from #3 to #5.

Selecta may be enabled by default (see the receiver configuration information) and may be enabled or disabled by using a power-on configuration change (see Power-On Configuration Changes) or by programming.

If Selecta is enabled, the transmitter's Selecta switch value will be saved when the transmitter and receiver are bound. A new Selecta value (i.e. switch position) can be stored either by rebinding or by using the power-on changes to disable and then re-enable Selecta.

Note: when the Selecta switch is changed to control a different loco, the newly selected loco responds to the transmitter control settings. The current range of Selecta enabled transmitters have no model memory so cannot have different throttle settings, etc. for each loco. Thus, although Selecta may be used to manage many moving locos, this must be used with care and is not recommended. Micron intends to introduce a transmitter with model memory but the release date is not known.

---

Directional Lighting (top)

The default configuration has pins P6 and P7 setup to drive front and rear LED lights; P6 powers a forward LED and P7 a backward facing LED. The directional lighting pins can be changed by programming the receiver.

MR001d has an on-board 3.3V regulator and 220 ohm resistors in series with the signal pins so limits the LED current to approximately 15mA. The LED should be connected between the signal and negative pins (top and bottom rows).

The default setting is for the LEDs to follow the throttle channel with 'centre-off' and is appropriate for a battery loco with ESC. For live-steam use, the LED behaviour can be reprogrammed for 'low-off' and this uses full-range throttle on ch1 and directional control on ch3.

To change the way that directional LEDs respond to throttle movement, set the appropriate throttle mode using a Power-On Change or by programming.

---

Cruise Control (top)

Cruise Control keeps a loco running if a receiver loses the signal from the transmitter, for example when going through a tunnel or behind a garden building or some dense bushes. All receiver outputs hold their current setting until the transmitter signal is reaquired. Outputs also hold when a Selecta-enabled receiver (see Selecta) is de-selected.

Cruise Control allows you to switch off the transmitter if, for example, you are running the loco round a continuous circuit.

The default MR001d setup is Cruise Control enabled. It can be disabled using a Power-On Change or by programming. If disabled, servos on pins designated as throttle/regulator will be moved to the stop position when signal is lost. Failsafe positions for all R/C channels may optionally be enabled; in this case, the values of all R/C channels are saved after a successful bind and restored when signal is lost. The time delay between loosing signal and initiating throttle close and failsafe is configurable between 1s and 4s - 3s is set when cruise control is disable using the Power-On Change.

---

Emergency Stop (top)

Any of the transmitter controls can be used as an 'Emergency Stop' function to bring the loco/vehicle to a stop. Emergency Stop is not enabled by default and must be configured by programming the receiver.

To enable Emergency Stop, you need to choose:

• the R/C channel
• whether a low or high signal is used to trigger
• the delay before stopping - i.e. the number of seconds that the R/C channel must be in the trigger state before Emergency Stop is actioned

For example, the Tx22X transmitter button S2 (in-between the 2 toggle switches) could be used: this controls R/C channel 4 and the signal is low when the button is pressed.

---

Power-On Configuration Changes (top)

A few configuration changes can be made without programming. A link across the output pins using one or both of the jumper plugs is used to action the change. It is best practice to do this with no other connections to the receiver pins. A change is made by connecting the appropriate P pins with the receiver off, switching the receiver on and observing the LED flash pattern, removing the connection which is confirmed by a rapid LED flash and then switching the receiver off. The exception are the P1/P3 options:

• 5-flash to enter programming mode; after removing the connection, MR001d goes into receive mode with programming enabled
• the toggle options show a flash count to indicate if the option is enabled (2-flash) or disabled (1-flash) and then the rapid flash is shown

Servo end point adjustment and reversing may also be performed using the small jumper plug to select a servo and then using the large jumper plug to adjust - see Servo Throw Adjustment.

The changes all cycle though the flash counts while the jumper is installed. Each flash count is repeated once (i.e. shown twice) and then increments to the next, cycling back to 1 when the maximum is reached. When the desired flash count has been shown, removing the large jumper acknowledges the selection by showing a rapid flash. There will be a short delay between removing the jumper and the rapid flash due to the time taken to write the changes to permanent memory. The receiver should be powered off when the rapid flash starts. If you switch off before removing the jumper connection, the configuration is not changed. If you switch off after removing the jumper and before the rapid LED flash, the receiver data is likely to be corrupted and you should perform a reset.

This is a summary of the configuration changes that can be made, performed using the large and small jumper plugs. A '-' in the Small Jumper column indicates that the small jumper is not used.

1 = Throttle Configuration
1 = Throttle Number (there is only 1 on MR001d)
2 = Low Off Throttle
1 = Throttle on R/C channel 1
3 = Direction Control on R/C channel 3

---

Configurations (top)

The pre-loaded configurations are shown below. Unless otherwise specified when the receiver was ordered, config 1 is enabled by default. The other loaded configurations can be selected using a power-on configuration change or by programming.

P1..P7 are the JR style pins at the front of the receiver, P8..P11 is the optional JST-SH connector at the rear of the receiver.

Configurations

This configuration table is for firmware version 1.1. For other versions, refer to mrxxx_version.

The pre-loaded configurations are shown below. Unless otherwise specified when the receiver was ordered, config 1 is enabled by default. The other loaded configurations can be selected using a power-on configuration change or by programming.

Port	1: Centre-off throttle, no Selecta	2: MyLocoSound triggers on P3-P5 (Tx22)	3: MyLocoSound triggers on P3-P5 (Tx20)
H1	Centre-Off ch1	Centre-Off ch1	Centre-Off ch1
P1	Throttle servo or ESC on H1	Throttle servo or ESC on H1	Throttle servo or ESC on H1
P2	Servo on ch2	Servo on ch7	Servo on ch2
P3	Servo on ch3	Momentary on ch3, low 0V	Momentary on ch2, low 0V
P4	Servo on ch4	Momentary on ch3, high 0V	Momentary on ch4, low 0V
P5	Servo on ch5	Momentary on ch5, low 0V	Momentary on ch5, low 0V
P6	Forward Light on H1 (LED2)	Forward Light on H1 (LED2)	Forward Light on H1 (LED2)
P7	Reverse Light on H1	Reverse Light on H1	Reverse Light on H1
P8	Momentary on ch3, low 3.3V	Momentary on ch3, low 3.3V	Momentary on ch3, low 3.3V
P9	Momentary on ch3, high 3.3V	Momentary on ch3, high 3.3V	Momentary on ch3, high 3.3V
P10	Latch on ch3, start 0V, toggle low	Latch on ch3, start 0V, toggle low	Latch on ch3, start 0V, toggle low
P11	Latch on ch3, start 0V, toggle high	Latch on ch3, start 0V, toggle high	Latch on ch3, start 0V, toggle high
LED2	P6	P6	P6
Selecta	Disabled	Enabled	Disabled
LVC	Enabled	Enabled	Enabled
Sleep time	1 hour	1 hour	1 hour
Cruise	Enabled	Enabled	Enabled

Other configurations are available to special order or you can configure yourself by programming.