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I think you have not any chance to get the speed into the display. The 72122 controller use TTL bus, the Mino controller use RS485 bus, so 72122 controller can't send the speed to VCU and VCU can't send the speed to dashboard. I think the same story has place for the side stand and READY button, the dashboard can't communicate with 72122 controller.

@deadropine

Can you provide the current settings of your 72122 HK3A controller?

@vlad_vy
@derdude
Attached my setting for the lingbo 72122 HK3A. Main differences are the max rpm (3000) and the high speed percent (110 %). Do you think it would be possible to somehow build in a serarate GPS speedometer with R485 communication and connect it to the display or to the VCU?

1. You can't use different manufactures devices to communicate over RS485 bus. Most likely they can't to communicate. The RS485 is physical layer protocol, we don't know high level protocol (Modbus or something else) and devices ID.

2. It looks like "Motor BEMF Constant" is way high for inrunner motor.

Ke = V peak / ω no-load = 1 / Kv

so Kv = 1 / Ke = (1 / 90) * 1000 = 11.1 (rpm/v), max. rpm = 11.1 * 64.8V = 719 rpm

It looks like LB GUI display Ke in V/krpm. Max phase voltage will be about: 72V * 0.9 = 64.8V. Motor BEMF Constant will be: Ke = 64.8 *1000 / 3000 = 21.6 (V/krpm)

You can try export the current settings, edit FOC file to change "Motor BEMF Constant" to 20 (offset 0206h: 00 14), then import FOC file. Check the "Motor BEMF Constant" is really changed to 20. Check "Motor BEMF Constant" after the Mino run, may be it calculated by controller at motor start.

3. Also, usually, to remove speed limit, the "Speed Limit Percent" is set to 100, then disabled.

I had imported those parameters and used the Controller in the bike. Worked. BEMF was not changed. I think it has no influence.

@deadropine

I'm planing to use QS Motor CT-22 48v 144v programmable electric motorcycle speedometer. ===============================================================================

Initial setup for Tromox Mino:
P 6610 Parameter set password
setting, current value, description
0 225 Speed (Hall signal fequency Hz at 60 km/h)
1 225 Mileage (Hall signal fequency Hz at 60 km/h)
2 551 20% Charge Voltage
3 592 40% Charge Voltage
4 632 60% Charge Voltage
5 673 80% Charge Voltage
6 714 100% Charge Voltage
7 551 20% Discharged voltage
8 592 40% Discharged Voltage
9 632 60% Discharged Voltage
A 673 80% Discharged voltage
B 714 100% Discharged voltage
C 300 Deboost battery charge level in seconds (100% to 0%)
D 510 0% Charge Voltage
E 510 0% Discharge Voltage
F 1 Charge Memory %
R 0 Low Charge Warning voltage (not supported)
H 20
L 120
J 30 Battery charge level status interval in seconds

===============================================================================

Clock adjust
With the power off, press and hold the [ADJ] button down while turning the ignition key on. The display will turn on and the" minutes" will start to flash, which indicates that they are ready to be modified. Release the [ADJ] button then either use short presses of the [ADJ] button to increment the minutes by one, or press and hold the [ADJ] button which will cause the minutes to increment continuously until you release the button. To select the hours, click the [SEL] button once -- this will cause the hours to flash, indicating that they are ready to be modified. Once again you can either use short presses of the [ADJ] button or press and hold the [ADJ] button to make changes to the hours. When done, click the [SEL] button once more and the clock will be all set and the dash will return to normal operation. To make additional changes to the clock, turn the power off and start all over again.

Metric/Imperial Switching
With the display on, simply press and hold the [SEL] button for 10 seconds. This will toggle things from metric to imperial measurement (and vice versa).

Reset the Trip Odometer
With the display on, simply press and hold the[ADJ] button for 3 seconds. This will this will clear the trip odometer.

Reset the total Odometer back to zero
Hold down [SEL] for power on, enter the code interface, the display shows P-0000 lower bit 1Hz flash; under the code interface, short press flash place means add one number from 0-9 for recycle; long press flash place means shift left for one digital; After four numbers are added, if you entered code 8810, the total trip will reset to zero. If you entered code 6810, then you will enter the odometer setting interface (see below); If you entered any other numbers, it will jump back to code interface, P-0000.

Adjusting the Speedometer Parameters
With the power off, press and hold the [SEL] button, then turn the ignition key on. The display will show "P-0000" which is where you enter one of three codes to make changes to the unit. To change the speedometer values, the code you want to enter is 6610.

To do so, you modify each digit one at a time starting from the right. A single click of the [SEL] button will increment the current flashing value (e.g. 0 becomes 1, 1 becomes 2, and so on). Keep clicking until the value you want is showing. Then press and hold the [SEL] button for three seconds to jump to the next digit to be modified and so on. When you have finally entered the value of 6610, then press and hold the [SEL] button and you will be taken to the Parameter Setting Interface.

===============================================================================

I will not use backup power wire for RTC clock (yellow wire), so I added backup battery (CP2032) to RTC chip (DS1302). I unsolder pin 8 and solder two thin wires to pin 8 (red) and GND (black). Other wire ends solder to battery holder (from old PC motherboard). The speedometer PCB has not space for battery holder, so I wraped the battery holder with foam rubber and place it in bottom part of the speedometer body, under speedometer PCB.

that is basically the display Zero used for their S and DS, with their own brand logo at the top:

It has the similar exterior, but very different inside. It use CAN bus. It has backup battery for RTC clock. And so on.

The CT-22 speedometer tested in parallel to original Tromox Mino dashboard, as a result the speed and mileage settings are corrected.

Corrected setup for Tromox Mino:
P 6610 Parameter set password
setting, current value, description
0 230 Speed (Hall signal fequency Hz at 60 km/h)
1 230 Mileage (Hall signal fequency Hz at 60 km/h)
2 551 20% Charge Voltage
3 592 40% Charge Voltage
4 632 60% Charge Voltage
5 673 80% Charge Voltage
6 714 100% Charge Voltage
7 551 20% Discharged voltage
8 592 40% Discharged Voltage
9 632 60% Discharged Voltage
A 673 80% Discharged voltage
B 714 100% Discharged voltage
C 300 Deboost battery charge level in seconds (100% to 0%)
D 510 0% Charge Voltage
E 510 0% Discharge Voltage
F 1 Charge Memory %
R 0 Low Charge Warning voltage (not supported)
H 20
L 120
J 30 Battery charge level status interval in seconds

By the way, the RTC clock in the speedometer works without the main power supply for two days. The time is accurate. So the added backup battery (CP2032) works fine.

Measured the real circumference of the rear wheel, 1288 mm.

That is, to display the real speed, the signal frequency of the Hall sensor should be: 229 Hz.

This is almost equal to what was obtained earlier. I.e. the original Tromox Mino speedometer accurately displays the real speed.