User's Manual
Onity HT24W / HT28 Smart  Hardware • 111 
Batteries – Extended Portable Programmer 
The uses 4 AA rechargeable batteries (Nickel – Metal-hydride NiMH). To charge 
the unit, plug in a 12VDC power supply to the connector on the top of the unit. 
There are 2 charging modes: 
•  Fast Charge – When the XPP is inactive and the batteries charge in 
about 1 hour. The green LED is illuminated when the XPP is in Fast 
Charge. 
•  Maintenance Mode Charge (Slow Charge) – When the XPP is active 
and the power supply is plugged in. 
XPP Connections 
The XPP connects to the HT28 System via the PC serial port using a DB9F – DB9F 
serial cable. It can also be connected to a USB port using a USB – RS232 adapter 
(sold separately). Plug one end of the connector into the PC serial port and the other 
into the 9 pin connector of the XPP. 
The XPP can also be connected to the HTCOM when used in Standard PP emulation 
mode. This is done using the DB9M – DB15F cable supplied with the unit. The 
DB9M connector is connected to the PP connection of the Communication 
Distributor and the DB15F connector to the 15 pin connection on the XPP. Note: 
When used in this mode, the extended features are not available. 
The XPP is connected to the lock with the XPP to Lock communication cable 
(DB15F – 2.1mm Barrel connector). Plug the DB15F connector into the 15 pin 
connector of the XPP and the barrel connector into the PP Jack of the lock. 
XPP Keypad 
The XPP has an easy to use and easy to understand keypad. The function of the keys 
is described below: 
• 
 Use to power the XPP on. 
• 
 Alpha Numeric keys, used to enter letters or numbers. 
• 
 The Enter key is used to complete a transaction, select an item 
in a list, or answer YES to a choice on the screen. 










