MR603c Top Click on image for a larger version.
MR603c is the 3rd version of MR603, a 2.4GHz DSM2/DSMX receiver which includes one integrated 3A reversable controller for brushed motors (ESC) plus 10 auxiliary outputs (4xF, 6xP) for lighting, sound trigger, couplers, etc. It can be used with any Spektrum DSM2/DSMX compatible transmitter; this includes all of the Micron model rail transmitters or a stick model aircraft type transmitter.
MR603c is 36.75x16x10mm and weighs 3.6g without leads. The voltage range is 5V to 20v and the 3A motor current rating makes it suitable for Gauges 0 and 1 plus 16mm narrow gauge. MR603c is available as board-only for you to add wiring or with a range of pre-wired leads / connectors. The standard output configuration is described on the outputs tab. If the wiring or configuration options do not meet your needs, please contact us to discuss your requirements.
An enormous range of programming features are provide to enable you to customise the operation of MR603c to suit your model. The current firmware version is 1.9.1. See MR603 Programming (v1.9.1) for full details of the available functionality or the user manual for brief details. Access to programming is either via a stick type transmitter or one of the Micron model rail transmitters . A stand-alone programmer with web interface is in development.
Size: 36.75 x 16 x 10mm Weight: 3.6g without leads Protocol: Spektrum DSM2/DSMX Voltage: 5V - 20V Motor Current: 3A max continuous P outputs: 6 (P1..P6), 0V when off, 3.3V when on, max 20mA F switches: 4 (F1..F4 or A..D) open when off, closed to negative when on
The current firmware is 1.9.1 and the current programming table is 1.9.1. See Version Info for other versions.
The MR603c has 1 x H, 6 x P and 4 x F outputs.
H: MR603c is intended for surface vehicles which require forward and reverse motor control. For brushed motors this is achieved with an H-Bridge - the H outputs. H outputs have 256 step resolution in both directions (512 total). They control speed with pulse width modulation (PWM) which, by default, is set to its fastest (quietest) 16kHz setting.
Each H output can handle up to 3A current. The main constraint with current is heat in the receiver. Higher currents may be possible if heat sinks are added or the PWM frequency is reduced. MR603c has one integrated ESC (H1). How the outputs are used has to be set with programming. Receivers are provided 'pre-programmed'. The default settings are shown on the instructions pages for each variant.
P: 'P' outputs are 'pads' with 'logic' type outputs. Pads are simply solder points for controlling external things. Logic outputs are either on or off (also known as high/low and 3.3v/0v in voltage terms). The action can be inverted so 'On' can mean 0v or 3.5v. P outputs are used to provide servo signals direct to the white/yellow lead on a servo. P outputs may also be used to drive LEDs and need a resistor to limit current to no more than 20mA.
If a P output is connected to another system (e.g. sound card) with an open-circuit voltage > 3.3V, a series resistor is required to ensure the 'pull-up' current is less than 50uA. A 4k7 ohms resistor is suitable when connecting to a MyLocoSound trigger input. A F output does not need the resistor as it is a switch to battery negative when on. P outputs can not be connected to a Mtroniks trigger input as the required current is too high, F outputs must be used instead.
F: 'F' outputs are 'buffered' P outputs capable of controlling up to 2A. The buffer is a FET (Field Effect Transistor) which provides a path to ground (0v) when on and is floating (disconnected) when off. Technically they are called 'open drain' (the equivalent with a transistor which is more widely known is called 'open collector'). The MR603c main board provides 4 x 'F' outputs, labelled A, B, C and D. When programming, the F outputs are numbered 7 though 10. F outputs are often used to control sound cards and lights that require more than 20mA.
If an installation requires more than 4 F outputs, a P can be converted to an F using one or more FET Buffers .
When wiring options are selected, these colours will be used:
P1 orange or yellow P2 turquoise or green P3 brown P4 purple A/F1 blue B/F2 green C/F3 pink D/F4 white L grey
Optional 4 pin JST-SH: P5 yellow P6 white 3.3V red 0V black
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 (aka 'paper-clip change') or by programming (v1.9.1). The throttle type can be toggled between Centre-Off and Low-Off using a power-on configuration change.
Configurations
This configuration table is for firmware version 1.9.
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
2: MyLocoSound triggers on A-D (Tx22)
3: MyLocoSound triggers on A-D (Tx20)
4: Road Vehicle
H1
Centre-Off ch1
Centre-Off ch1
Centre-Off ch1
Centre-Off ch3
P1
Forward Light on H1 (LED2)
Forward Light on H1 (LED2)
Forward Light on H1 (LED2)
Servo on ch2
P2
Reverse Light on H1
Reverse Light on H1
Reverse Light on H1
Left indicator activate=ch4, steer=ch2 (LED2)
P3
Momentary on ch3, low 3.3V
Momentary on ch3, low 3.3V
Momentary on ch3, low 3.3V
Right indicator
P4
Momentary on ch3, high 3.3V
Momentary on ch3, high 3.3V
Momentary on ch3, high 3.3V
Brake Light on H1
P5
Momentary on ch5, low 3.3V
Momentary on ch5, low 3.3V
Momentary on ch5, low 3.3V
Reverse Light on H1
P6
Momentary on ch5, low 0V
Momentary on ch5, low 0V
Momentary on ch5, low 0V
Momentary on ch1, high 3.3V
F1/A/P7
Forward Light on H1
Momentary on ch3, high closed
Momentary on ch2, low closed
Momentary on ch3, high closed
F2/B/P8
Reverse Light on H1
Momentary on ch3, low closed
Momentary on ch4, low closed
Momentary on ch3, low closed
F3/C/P9
Momentary on ch5, low closed
Momentary on ch5, low closed
Momentary on ch5, low closed
Momentary on ch5, low closed
F4/D/P10
Latch on ch5, start open, toggle low
Latch on ch5, start open, toggle low
Latch on ch5, start open, toggle low
Latch on ch5, start open, toggle low
LED2 P1 P1 P1 P2
Selecta Enabled
Enabled
Disabled
Disabled
LVC Enabled
Enabled
Enabled
Enabled
Sleep time 1 hour
1 hour
1 hour
1 hour
Cruise Enabled
Enabled
Enabled
Enabled
Other configurations are available to special order or you can configure yourself by programming (v1.9.1).
The default receiver setting is for the Low Voltage Cutoff (LVC) threshold to be determined from the voltage seen on initialisation - basically, the receiver firmware assumes use of a Lithium battery and makes a 'guess' at the numer of cells. The algorithm used for this calculation means that a 9V Alkaline or NIMH battery can often be interpreted as an almost discharged 3S LiPo. The solution is to either disable LVC, or set it to the correct value for your battery; this is done by programming the receiver. It is also safe to disable LVC for rechargable PP3 batteries as these contain a single LiPo cell plus voltage booster; the LiPo has a protection circuit which switches off when the cell is discharged.
Instructions for programming receivers using your transmitter are at the end of the information leaflet that came with the transmitter.
The receiver programming steps for LVC are:
disable LVC: 4 2 1
e.g. to set the LVC to 6.5V, the programming steps are: 4 2 3 6 5
The hardware version is marked on the receiver circuit board. The firmware version is identified by a letter written on one of the chips - e.g. 'D' indicates firmware version 1.4.
MR603 Hardware Version Release Date MR603a 2022-06-10 First release MR603b 2022-08-08 Change to motor driver due to component shortages MR603b2 2022-09-26 Change to avr64db32 CPU MR603c 2023-08-25 CYRF6936 radio chip
MR603 Firmware
The receiver is normally supplied as a bare board, with wiring options as specified in the menus below. The MR603c is available with either a short wire aerial or a extended aerial (100mm and 150mm) for use in metal bodied vehicles; when using the extended aerial, it should be mounted so that the last 30mm of the aerial can 'see' the transmitter.
The default behaviour of the P outputs and F switches are defined on the Configuration tab. F switches are best used for sound card triggers - select configuration #2 or #3 to match your transmitter controls. Other setups are available; contact Micron to discuss if none of the standard configurations or wiring options matches your need.
Selecta, Throttle and Wiring Options:
Selecta: Selecta (loco selection with Tx22, Tx24, etc)
Selecta enabled (Tx22/Tx24)
Selecta disabled (Tx10/Tx20/Tx21) Aerial: Select the extended aerial if MR603 will be enclosed within a metal bodied vehicle
short wire aerial
100mm extended aerial : +£3.00
150mm extended aerial : +£3.00 Throttle Control: centre off throttle
full-range throttle and direction on R/C chan 3 Power/Motor Leads/Connectors: no wiring, bare board
no wiring, JST-SH socket on P5/P6 : +£2.00
100mm battery & motor leads : +£2.00
100mm battery, motor & 'L' leads : +£2.25
terminal block for battery and motor : +£4.00 P outputs: These are logic level 0V/3.3V outputs, mainly used for LED lighting. The default configuration has auto-switched forward and reverse lighting on P1 and P2 with P3..P6 switched using transmitter controls. See the Outputs tab for wiring colours.
no P1..P6 wires
100mm leads on P1/P2 for LED lights : +£1.00
100mm lead on P1 for LED2 : +£0.50
100mm leads on P1..P4 : +£2.00
100mm leads on P1..P4 & plug/socket for P5/P6 : +£4.00 F switches: If sound trigger wiring is selected, specify the transmitter controls used for sound in the 'Receiver Config' menu below. Other wiring options and tx control mappings are available, contact Micron to discuss your requirements. See the Outputs tab for information on output usage and wiring colours.
no F1..F4 wires
100mm leads on F1/F2 for high voltage lights : +£1.00
100mm leads on F1/F2/F3 for sound card trigger : +£2.00
100mm leads on F1..F4 : +£2.00 Receiver Config: The receiver configuration may be changed if sound card triggers selected for the 'F' options above. Specify the transmitter controls to be used triggering sounds. If none are appropriate, contact Micron to discuss your requirements.
config 1: default
config 2: sound triggers on ch3 (toggle) and ch5 (bind button) - Tx21v2, Tx22v2
config 2: sound triggers on ch7 (Tx22X S3 toggle, Tx24 S1 toggle) and ch5 (bind button) - Tx22X, Tx24v2
config 3: sound triggers on ch2 (F1), ch4 (F2) and ch5 (bind button) - Tx20v2
config 4: indicator, brake and reverse lights for road vehicle LVC: The receiver has a low voltage cut-off (LVC) facility which stops the motor when the battery has reached its discharge voltage. The default setting is for LiPo batteries. If you are using NiMH or rechargeable PP3, the LVC should be disabled - see Low Voltage Cutoff tab.
LVC enabled (Lithium)
LVC disabled (NiMH or rechargable PP3) Heatshrink Cover: Select 'cover supplied loose if you intend to add lead-out wires to the receiver; otherwise select 'applied to board'. If you want the receiver protected against accidental contact with metal parts, please select the 'heatshrink applied' option.
heatshrink cover applied to board
heatshrink cover supplied loose
Base Price:
£ 42.00
Total Price:
£ 42.00
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