DL500 Support
Find installation, app and power guidance for your DL500 retrofit smart lock.
Manual & installation · App & keypad · Power & backup · Get help
Manual & installation
Open the official DL500 user manual
DL500 fits compatible existing locks; it is not a replacement deadbolt. Check the cylinder or thumbturn, mounting clearance, required adapter and key operation against the manual before fitting.
If the mounting arrangement is unclear, send support photos of the inside, outside and edge of the door. Do not force an adapter or modify the cylinder to make it fit.
App & keypad setup
Use the CLDBUS app and the pairing instructions supplied for DL500. Start with the manual's installation and calibration steps before adding everyday access.
Fingerprint and passcode access depend on the compatible external keypad. Check the contents of your package and follow the keypad pairing instructions before enrolling users.
Local Bluetooth access and remote access are different. Contact support to confirm the gateway and configuration needed for your version before relying on remote control.
Power & backup access
- The lock uses a rechargeable battery. Follow the manual's removal, charging and refitting instructions.
- The external keypad has a separate AA battery supply. Check the lock and keypad power separately.
- Confirm how your existing mechanical key operates with the fitted lock. Do not assume every cylinder permits outside key operation with a key inserted inside.
- Test normal and backup access with the door open before putting the system into use.
Installation or connection problem?
Tell us whether the issue is with the lock, keypad or app. Include any light or error message, whether the door is open or closed, and the adapter/cylinder arrangement. Ask for guidance before resetting if you need to preserve existing settings.
Contact LNDU Support
Include DL500, your order number, and relevant photos or a short video. Hide keys' identifying details, passcodes and other private information.