change unknown coupling password

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Question
Answer
Yes, several HHD's can be used with a single lock, as long as the HHD's have the same Coupling Password as the lock.
The HHD coupling password is set during the lock initialization, coupling process.
When the coupling password is changed the value is stored in the HHD and once coupled to a lock, the Coupling Password is also loaded in the lock/device memory.
The Coupling Password is compared whenever an HHD is trying to adjust lock configuration settings or downloading door programming files.
Once a user changes the SUS coupling password , the previous SUS coupling password is also saved by the SUS program; this allows the user to update multiple locks with a new Coupling Password witho...
The Coupling Password update is automatic; whenever the Schlage Utility Software, with a new Coupling Password connects with a device, the Schlage Utility Software will automatically update its old...
The internal process to couple a device with new SUS password is described as follows: the SUS first tries to couple with the current password.  If that fails, the SUS tries to couple with the prev...
To verify that the device/lock is coupled; click on the SUS device options-> Couple HHD to device , a message will pop up confirming that the device is already coupled.  
After updating the SUS coupling password, subsequent HHD’s will need the new coupling password entered before they can update any information in the lock, once the HHD has the correct coupling pass...
  1) RS-485 communication will NOT interfere with a new firmware update on an AD300. You do not need to disconnect the RS-485 wires from the AD300. The AD300 will not be onlin...
  Steps to update firmware on an AD300. A) Keep the VIN/GND or AUX power applied. The AD300 will not function properly on AA battery power. B) Connect the SUS/HHD to the USB connector and p...
Customers should maintain their Schlage Utility Software at the latest version that is available.  This ensures that they have the latest features available and will be compatible with current...
Follow the link to the Schlage Technical Support page and find at the bottom of the page under "AD-Series Accessories" the Schlage Utility Software Update Guide,&...
Updating the Schlage Utility Software (SUS) on a Hand Held Device (HHD) will cause the SUS "Login Password" AND the current device "Coupling Password" to be reset to factory default settings of - 1...
This change was implemented in firmware package CO.A.6 (or later) to help the customer in the communication and coupling process between the CO200 (CO250) and the hand held device (HHD). ...
The green LED is to be lit up until the spindle (Triangles and Key Switch) are aligned properly; providing a visual indication of the problem.  
If the mechanical alignment of the triangles on the back of the outside escutcheon are not aligned, the CO200 or CO250 will not connect with the SUS/HHD and will appear to be unresponsive...
In firmware CO.A.6 (or later) the Schlage button on the CO200 (CO250) will turn green anytime that the spindle triangles on the front escutcheon are out of alignment or the mechanical key switch is...
When unlocking the CO200 door by mechanical key override, the green led will be continuously ON until the key is released. This will occur after firmware CO.A.6 (or later) has been installed int...