SW-R21 E-Bike Display
Specifications:
- Working Voltage: DC 12V/24V/36V/48V/52V/60V/72V
- Rated Working Current: 12mA
- Leakage current: [specification missing]
Product Information:
The E-Bike Display Model SW-R21 by Changzhou Sciwil E-Mobility
Technology Co., Ltd. is a high-quality display designed for EN15194
electric bikes. It features a high-brightness color LCD and a
minimalist interface, providing an ideal Human-Machine Interface
(HMI) solution.
Product Usage Instructions:
Safety Notes:
Before using the E-Bike Display, please read and adhere to the
safety notes provided in the user manual:
- Do not plug or unplug the display while your E-Bike is powered
on. - Avoid clashes or bumps to the display.
- Avoid using in heavy rains, snow, or prolonged exposure to
strong sunlight. - Do not tear the waterproof film on the screen’s surface to
maintain water-tight performance. - Avoid unauthorized adjustments to default settings to ensure
normal E-Bike operation. - If the display malfunctions, send it for authorized repair
promptly.
Operation:
1. Display Interface:
The display interface consists of three main sections:
- 1.1 Riding Interface
- 1.2 Setting Interface
- 1.3 Error Interface
2. Key Pad:
The key pad allows you to interact with the display for various
functions.
3. Key Operation:
Understand the key operations to navigate through different
display options.
4. Settings:
Access and adjust different settings on the display as
needed.
5. Error Code:
Learn about error codes and how to troubleshoot any issues that
may arise.
6. Connection:
Establish and maintain connections as required for optimal
functionality.
Warranty:
The product comes with a warranty. Refer to the user manual for
details on warranty coverage.
Version:
The current version of the protocol is UART 2.0 Version V6.01.
Ensure compatibility with your system.
Frequently Asked Questions (FAQ):
Q: Can I adjust the brightness of the display?
A: Yes, you can typically adjust the brightness in the settings
menu of the display interface.
Q: How do I reset the display to default settings?
A: Refer to the user manual for specific instructions on
resetting the display to default settings.
NO.XSW-J-06-0119-2025
USERS GUIDE SW-R21
E-Bike Display ModelSW-R21 ProtocolUART2.0 VersionV6.01
Scan QR Code to Download PDF
Changzhou Sciwil E-Mobility Technology Co., Ltd.
Website
Contents
. Safety Notes………………………………………………………………………………… 3 . Overview…………………………………………………………………………………………. 4
1. Product Name and Model ………………………………………………………………… 4 2. Product Introduction…………………………………………………………………………..4 3. Specifications……………………………………………………………………………………….4 4. Function……………………………………………………………………………………………….. 4 5. Size……………………………………………………………………………………………………….. 5 6. Assembly……………………………………………………………………………………………… 5 7. Serial Code………………………………………………………………………………………….. 6
. Operation…………………………………………………………………………………………6
1. Display Interface……………………………………………………………………….6
1.1 Riding Interface………………………………………………………………………… 6 1.2 Setting Interface………………………………………………………………………. 7 1.3 Error Interface……………………………………………………………………………8
2. Key Pad…………………………………………………………………………………………… 8 3. Key Operation…………………………………………………………………………….. 8
3.1 On/Off…………………………………………………………………………………………. 9 3.2 Assist Level………………………………………………………………………………… 9 3.3 Toggle Displays…………………………………………………………………………. 10 3.4 Light On/Off………………………………………………………………………………..10 3.5 Walk Assist Mode……………………………………………………………………… 10 3.6 Dark Mode/ Daylight Mode Switch…………………………………………11
4. Settings…………………………………………………………………………………………. 11 5. Error Code……………………………………………………………………………………. 21 6. Connection……………………………………………………………………………………. 21
IV. Warranty…………………………………………………………………………………………22 V. Version……………………………………………………………………………………………… 22
. Safety Notes
PLEASE TAKE CAUTION WHEN USEDO NOT PLUG OR UNPLUG THE DISPLAY WHILE YOUR E-BIKE IS POWERED ON. AVOID CLASHES OR BUMPS TO THE DISPLAY. AVOID USING IN HEAVY RAINS, SNOWS OR LONG EXPOSURE TO
STRONG SUNLIGHT. DO NOT TEAR THE WATER-PROOF FILM ON THE SURFACE OF THE SCREEN, OTHERWISE THE WATER-TIGHT PERFORMANCE OF THE PRODUCT MAY BE DEGRADED. DO NOT PLUG OR UNPLUG THE DISPLAY WHILE THE SYSTEM IS POWERED ON. UNAUTHORIZED ADJUSTMENT TO DEFAULT SETTINGS IS NOT SUGGESTED, OTHERWISE NORMAL USE OF YOUR E-BIKE CAN NOT BE GUARANTEED. WHEN THE DISPLAY PRODUCT DOES NOT WORK PROPERLY, PLEASE SEND IT FOR AUTHORIZED REPAIR IN TIME.
. Overview
1. Product Name and Model Product Name: E-Bike Display Product Model: SW-R21
2. Product Introduction SW-R21 features high-brightness color LCD and minimalist interface, working as an ideal HMI solution for EN15194 electric bikes.
3. Specifications Working Voltage: DC 12V/24V/36V/48V/52V/60V/72V Rated Working Current: 12mA Leakage current: <1uA Screen Size: 2.0″ TFT Communication Type: UART (by default) / CAN (optional) Optional Functions: Bluetooth Working Temperature: -20°C ~ 60°C Storage Temperature: -30°C ~ 70°C Waterproof Rating: IP66
4. Function Boot password System unit switch (km/h or mph) Assist Level Control and Display Battery indication: battery level percentage, low voltage indication Speed display(in km/h or mph) real-time speed (SPEED), max speed (MAX), average speed (AVG) Distancesingle-trip distance (TRIP), total travel distance (ODO) Assist Mode Control and Display (3/5/9 levels) Walk assist mode Front light indication: front light status supported by controller. Error code indication Riding Info: Braking Status, Front Light Status, Cruise, Low Voltage.
Turning Signals: This function works with controller. Dual Drive Control and Display: This function works with controller. Status of Double Battery Packs: optional, works with controller. NFC Function: optional. Bluetooth Connection: optional, support OTA upgrade via mobile phone.
5. Size
6. Assembly 6N·m
1N·m 1-2N·m
5-7N·m 5-7N·m
12-13N·m
Fix the display with stem: Arrange cables through the stem, then fix the display to the handlebar. Use a M2 Hex Wrench to fix and tighten the display screw. Standard fixing torque: 1N·m. Then use a M3 Hex Wrench to fix the 1pc screw on the cover lid of cables, Standard fixing torque: 1-2N·m..
Fix the stem with front fork: Mount the stem on the tube of front
fork. Use a M5 Hex Wrench to fix and tighten the 1pc of screw
(Standard fixing torque: 5-7N·m). Then cover the screw with the rubber cap.
Open the clipper on the stem and mount it on the vertical tube of the
front fork. Adjust it to a proper facing angle, and and fix the stem on the front fork. Use a M4 Hex Wrench to fix and tighten the 2pcs of screws. Standard fixing torque: 12-13N·m.
Fix the stem with handlebar: Open the front lid of the stem, mount
the stem to the middle of the handlebar. Adjust it to a proper facing angle, and and fix the stem on the front fork. Use a M4 Hex Wrench to fix and tighten the 4pcs of screws. Standard fixing torque: 6N·m.
Adjust the angle of the stem, then use a M5 Hex Wrench to fix and
tighten the 1pc of screw. Standard fixing torque: 5-7N·m.
Fix the keypad with the handlebar: Use a M2 Hex Wrench to fix and
tighten the 4pcs of screws. Standard fixing torque 1N·m. *Damage due to excessive fixing torque is not covered by warranty.
Plug the 5-pin connector of the display to the coupling connector of the
Controller, plug the 3-pin connector of the keypad to the keypad.
7. Serial Code
Example 1111 22 333333 555 6666 36V
1111Customer Code 22Protocol Code 333333P.O. Date YYMMDD) 555Order Receiving Number 6666: Production Date YYMM)
Marked at the back of display
. Operation
1. Display Interface 1.1 Riding Interface
Dark Mode Interface
Daylight Mode Interface
Status: Real-time Riding Status: Bluetooth, Front Light, Brake, Low Voltage, Turning, Cruise, Drive Status, etc.
Battery Status: Residual Battery Percentage Multi-Function Section: ODO (total range), TRIP (single ride range),
MAX (max. speed), AVG (average speed), TIME (riding time), VOL (battery voltage), Wh (motor power), CUR (current), etc. Assist Level Mode: 3/5/9 Levels available.
1.2 Setting Interface
In the above interface: Setting Item: System Unit, Parameter Value: km/h
1.3 Error Interface
Error Mark Error Note
In the above interface: Error Indicator: ERROR, Error Note: Communications Error
2. Key Pad
SWK2 Keypad Illustration:
There are 5 keys on the SWK2 keypad, in the following instructions: is called Plus Key is called On/Off Key is called Minus/Walk Assist Key is called Light Key is called Info Key
3. Key Operation
Key operation guide as follows:
Press and Hold: means press and hold the key(s) for more than 2s. Press: means press the key(s) for less than 0.5s. Double Tap: means double tap the key(s) within 0.3s
3.1 On/Off Turn on the Display: When the display is off, press and hold the On/Off Key to turn on the display, it will show boot interface and then enter riding interface. (If boot password is activated, enter the boot password at start). Turn off the Display: When the display is on, press and hold the On/Off Key, the display will be turned off. If no operation is engaged for 10min (0km/h), the display will be auto-off. Auto-off time can be set in the Settings.
3.2 Assist Level Press the Plus Key or Minus/Walk Assist Key to switch assist levels. There are 5 levels by default: 0/1/2/3/4/5. 0 means no assist power.
Level0
Level1
Level2
Level3
Level4
Level5
3.3 Toggle Displays When the display is on, press the Info Key to toggle among ODO (total range), Trip (single trip range), TIME (riding time) etc.
3.4 Light On/Off Turn on the Front Light: when the front light is off, press the Light Key to turn it on, and the light icon will be shown on the riding interface (to remove this functions, please reconfigure the controller). Turn off the Front Light: when the front light is on, press the Light Key to turn it off, and the light icon will be off on the riding interface.
3.5 Walk Assist Mode Engage Walk Assist Mode: On the riding interface, press and hold the Minus/Walk Assist Key to enter walk assist mode. Hold the Minus/Walk
Assist Key to engage walk assist mode, the walk mode icon will be shown on the riding interface, the real-time speed will be shown in the speed section. Disengage Walk Assist Mode: release the Minus/Walk Assist Key to disengage the walk assist mode, the icon will off on the riding interface.
3.6 Dark/Daylight Mode Switch When the Auto-Light is enabled, the display enters dark mode or daylight mode by a light sensor. When the Auto-Light is disabled, press and hold the Light Key to enter dark mode or daylight mode.
Dark Mode
Daylight Mode
4. Settings
4.1 Setting Operations Enter the Settings: when the display is on, press and hold the Plus
Key and the Minus/Walk Assist Key together to enter the Settings. Available setting items include: system voltage, wheel size (inch), magnetic steel number for speed gauge, speed limit etc (please refer to
4.2 Setting Items). Adjust Settings: on the Settings interface, press the Plus Key or the Minus/Walk Assist Key to set values for items. The value will blink after change. Press the On/Off Key to save the set value and switch to next item. Save and Exit Settingspress and hold again the Plus Key and the Minus/Walk Assist Key together to exit the Settings and save the set value. The system will save and exit automatically if there’s no operation for 10s. 4.2 System Unit: km/h or mph Press Plus or Minus to choose metric (km/h) or imperial (mph) unit.
4.3 Backlight Brightness Press Plus or Minus to choose among I~IIIII. I is darkest, IIIII is brightest
4.4 Auto-Off Press Plus or Minus to select 1~60min as auto-off time, which means the display will turn off automatically if no operations detected within this
period. Default Auto-Off time: 10min
4.5 Auto-Lamp On/Off Press and hold On/Off Key to turn on or off the front light automatically.
Digital scenario or analog scenario switch. * The current version only supports digital scenario 4.6 Battery Indication Press Plus or Minus to select among Voltage/Percentage/Off. Battery Indicator on the display will toggle among voltage value, battery percentage left and none. * Battery percentage display requires system-BMS communications.
4.7 Wheel Size Press Plus or Minus to set the correct wheel size. Default wheel size: 26inch. Incorrect or inaccurate wheel size may lead to incorrect speed display. Unit: inch, increment 0.1inch.
4.8 Voltage Level Press Plus or Minus to select. Working voltage range: 24~72V.
4.9 Low Battery Level In light of low battery protection volt level, press Plus or Minus to set low
battery protection level for the vehicle.
4.10 Boot Password Press the Info Key to enter Passoword Settings. First to set is 4-digit boot password (as shown in the pictures below). Then you can set in turn passwords for setting menu, basic settings, advanced settings and change password.
4.11 Advanced Settings
Press On/Off Key to enter Advanced Settings. For password protected product, enter the correct password and press On/Off Key to enter Advanced Setting. Press Plus or Minus to set values, then press On/Off Key to save and switch to the next item.
4.12 Speed Limit Press Plus or Minus to set values for speed limit. Min. Value: 10km/h, Max. Value: 100km/h, increment: 1km/h. Default speed limit: 100km/h.
4.13 Current Limit Press Plus or Minus to set values for current limit. Min. Value: 6A, Max. Value: 50A. Default speed limit: 15A.
4.14 Auto-Cruise Press Plus or Minus to turn on or off the auto-cruise function.
4.15 Assist Levels Press Plus or Minus to select assist level mode: 3 levels / 5 levels.
4.16 Torque Level Range Press Plus or Minus to select signal voltage level for torque sensor: 500mV / 3500mV.
4.17 Poles in Motor Press Plus or Minus to set number of magnetic poles for speed gauge. Min. Value: 1, Max. Value: 255. Default poles number: 1.
4.18 Start Mode Press Plus or Minus to select start mode : Throttle on demand and Throttle after pedal. “Zero” means Throttle on demand, “Non-Zero”means Throttle after pedal.
4.19 Drive Mode Press Plus or Minus to select drive mode: 0 / 1 / 2. 0 means pedal assist only, 1 means throttle only, 2 means both modes available.
4.20 PAS Sensor Type Press Plus or Minus to select PAS Sensor Type: 5 / 8 / 12. This value is the number of magnetic steels on the PAS disc.
4.21 Start Sensitivity Press Plus or Minus to select start sensitivity range: 1~24. This value is the start latency after pedal.
4.22 Start Strength Press Plus or Minus to select start sensitivity range: 0~5. This value is the start power output after pedal.
4.23 Factory Reset Press the On/Off key to enter the Factory Reset Interface. Select YES to reset to factory setting, select Exit to return to the previous menu.
4.24 Information Press the On/Off key to enter the information interface and check info like speed record, distance record and serial numbers, etc.
5. Error Code
Error Code (decimal)
E00 E01 E02 E03 E04 E05 E06 E07 E08 E09 E10 E12 E13
Status
Normal Reserved Brake Error PAS Sensor Error (Riding Mark) Walk Assist Mode Real-Time Cruise Low Voltage Protection Motor Error Throttle Error Controller Error Communications Error BMS Communications Error Front Light Error
Note
Not Realized
6. Connection
Display to Controller Controller to Display Controller Connector
Pin No. 1 2 3 4 5
Wire Color RedVCC
BlueK BlackGND GreenRX YellowTX
Functions Display Power Wire Electric Lock Wire Display Ground Wire Display Data Receiving Wire Display Data Sending Wire
Extended Functions- Front Light: Brown (DD): The power wire (+) of the light White (GND): The ground wire () of the light.
Note: For waterproof connectors, wire sequences are concealed.
IV. Warranty
In compliance with local laws, Sciwil provides limited warranty period covering 24 months after the date of manufacturing (as indicated by the serial number), applies to quality issues during normal operations. The limited warranty shall not be transferred to a third party other than as specified in the agreement with Sciwil. Warranty Exclusions: Sciwil products that have been opened, modified or repaired without
authorization. Damage on the connectors. Damage to the surface after leaving factory, including shell, screen,
buttons, or other appearance parts. Damage to wiring and cables after leaving factory, including breaks and
exterior scratch. Damage or loss due to force majeure (e.g. fire or earthquake) or
natural disaster (e.g. lightening). Out of the warranty period.
V. Version
This display user manual is in compliance with the general software version (A/0) of Changzhou Sciwil E-Mobility Technology Co., Ltd. There are chances that display products on some e-bikes may have a different software version, which is subject to the actual version in use.
Documents / Resources
 | SCIWIL SW-R21 E-Bike Display [pdf] User Guide SW-R21, SW-R21 E-Bike Display, SW-R21, E-Bike Display, Display |