I have got two of these cheap Chinese RFID door lock control system. They claimed that it includes an English user manual, however, couldn’t find it inside! With some Chinese guessing and trial-error, here is a new user manual for the device shown below:

YOUHE YH2000-C RFID System

To introduce a new card / key-chain:

Press: # > 12345 > 41 > # > read new card > read more cards if needed > # > *

To remove a card / key-chain:

Press: # > 12345 > 61 > # > read the card to be removed > read more cards if needed > # > *

To enable access control using password: 

Press: # > 12345 > 301 > *

To disable access control using password

Press: # > 12345 > 300 > *

To change admin password:

Press: # > 12345 > 1 > enter your new password of 5 digits > *

To change public access password:

Press: # > 12345 > 2 > enter your new password of 4 digits > *

Factory default admin password is “12345” and public access password is “8888”.

Hope it was useful.

Edit:

In case people loose the Chinese manual, here is the connection diagram for the connectors behind the unit: Connection Diagram for YH-2000C
For more info, just email me or ask in the comments.
inf@freshengineer.com

Edit:
Thanks to Levas for his kind comment that points to a better manual than what I wrote:
http://www.vabolis.lt/stuff/RFID_lock_keypad_manual.pdf

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