The CYSUM CM-900 Electric Bicycle LCD is a display unit and control interface for electric bicycles, providing real-time data, operational settings, and diagnostic information. It is designed to enhance the user experience by offering comprehensive control and monitoring capabilities for the e-bike.

Function Description:

The CM-900 LCD serves as the central hub for monitoring and controlling various aspects of an electric bicycle. Its primary functions include:

Real-time Data Display: Shows current speed (in mph or km/h), pedal-assist system (PAS) level, battery charge level, and front light status.
Trip and Odometer Tracking: Records single trip distance (TRIP) and total accumulated distance (ODO). It also displays the bike computer's working time (TM) and any error codes (ERR).
Operational Control: Allows users to turn the bike computer and front light on/off, activate walk mode, and adjust PAS levels.
Setting Configuration: Provides access to a range of customizable settings, referred to as "P Levels," to tailor the e-bike's performance and display.
Diagnostic Information: Displays error codes to help identify and troubleshoot potential issues with the e-bike's components.

Important Technical Specifications (P Level Settings):

The CM-900 LCD offers a variety of technical specifications configurable through its P Level settings:

P01: Brightness Setting: Adjusts display brightness from 1 (darkest) to 3 (brightest).
P02: Speed Unit Setting: Allows selection between Kilometers (0) and Miles (1) for speed and distance display.
P03: Working Voltage Setting: Configurable for 24V, 36V, or 48V systems, matching the e-bike's battery voltage.
P04: Bike Auto Shutting-down Time Setting: Sets the inactivity period (1-60 minutes) after which the bike computer automatically turns off to conserve battery.
P05: PAS Preference Setting: Determines the number of PAS levels displayed: 0 (1-3 levels), 1 (1-5 levels), or 2 (1-9 levels). Note that the top and lowest power levels remain consistent across these modes.
P06: Wheel/Rim Diameter Setting (Inch): Configurable for common wheel sizes such as 20, 22, 26, or 28 inches.
P07: Speed Monitor Setting: Range 1-100. This is a technical setting for engineers and should not be modified by users.
P08: Speed Limit Setting: Range 1-100 KM. Allows users to set a speed limit for the e-bike. It's important to note that the actual top speed is also constrained by the motor and controller's limits. For example, if the motor's limit is 40 KM/H, setting the display to 50 KM/H will still result in a 40 KM/H top speed.
P09: Zero Boost or Non-Zero Boost Setting:
- 0 (Zero Boost): Provides immediate motor assistance upon throttle engagement or pedal-assist activation.
- 1 (Non-Zero Boost): Requires the rider to pedal to a certain speed before the throttle or PAS becomes active.
P10: Driving Modes Setting: Configures how the e-bike's power is delivered:
- 0 (PAS only): Throttle is inactive, only pedal-assist works.
- 1 (Throttle only): PAS is inactive, only throttle works.
- 2 (Both throttle and PAS): Both throttle and pedal-assist are active.
P11: PAS Sensitivity Setting: Range 1-24. A technical setting for engineers, not for user modification.
P12: PAS Strength Setting: Range 1-5. A technical setting for engineers, not for user modification.
P13: PAS Magnetic Sensor Setting: Range 5/8/12. A technical setting for engineers, not for user modification.
P14: Controller Max Current Limit Setting: Range 1-20A. Sets the maximum current the controller will draw.
P15: Controller Low Voltage Setting: Range N/A. Requires checking the controller's technical data sheet for reference.
P17: N/V: Range 100 (default).

Usage Features:

The CM-900 LCD offers intuitive usage features for daily riding and configuration:

Power On/Off: Pressing the 'M' button for a few seconds turns the bike computer on or off.
Front Light Control: After turning on the bike computer, pressing the '+' button for 3 seconds activates or deactivates the front light.
Walk Mode Activation: After turning on the bike computer, pressing the '-' button for 3 seconds activates walk mode, which provides low-speed assistance for pushing the bike.
PAS Level Adjustment: Pressing the '+' button increases the PAS level, while pressing the '-' button decreases it.
Data Checking (ODO/TRIP/ERR/TIME): A single press of the 'M' button cycles through ODO (total odometer), TRIP (single trip distance), ERR (error code), and TM (bike computer working time).
Entering Setting Mode: Pressing both the '+' and '-' buttons simultaneously for 3 seconds enters the setting mode.
Navigating P Levels: Within setting mode, pressing the 'M' button switches between different P level settings (P01 to P18).
Adjusting P Level Values: While on a specific P level, pressing the '+' or '-' button changes its data code or value.
Speed/AVG/Max Checking: After turning on the bike computer, pressing the 'M' button for 3 seconds cycles through real-time speed, average speed (AVG), and maximum speed (MAX).

Maintenance Features:

The CM-900 LCD includes features that assist with maintenance and troubleshooting:

P16: ODO, Total Odometer Clearance Setting: In setting mode, pressing the 'M' button for 5 seconds allows clearing the current total odometer to zero. This can be useful for resetting the odometer after significant repairs or for tracking new usage periods.
P18: Bike Computer Reset Setting: In setting mode, pressing the 'M' button for 5 seconds resets the bike computer to its default settings (SSSS will show on LCD). This only affects the bike computer's settings, not the e-bike's overall system.
Error Codes: The display provides specific error codes to help diagnose issues:
- 00000: Normal operation.
- 00006: Low Battery Voltage – Indicates the need to charge the battery.
- 00007: Motor Failure – Suggests checking the motor cable connection for looseness or damage.
- 00008: Throttle Failure – Recommends checking the throttle cable connection for looseness or damage.
- 00009: Controller Failure – Advises checking the controller cable connection for looseness, damage, or incorrect connection.
- 00010: Data Receiving Failure – Points to issues with the bike computer's connection, suggesting checking for looseness or damage.
- 00011: Data Sending Failure – Similar to 00010, indicates problems with the bike computer's connection for sending data.

These error codes are crucial for identifying the source of a problem, enabling users or technicians to perform targeted checks and repairs. It's important to note that default settings for P Levels may vary between different e-bike models, even if they use the same bike computer.

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