UNC100 Hardware Manual V1.4
RBH Access Technologies Inc.
Page
11
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36
Battery Charger
The battery charger routes input power from the 13.8v input source or POE module and constantly monitors
the battery voltage.
Reverse Battery Protection
A combination of a three ampere diode and a 1.6 amp thermal fuse protects against accidental connection
of a battery in the reverse direction.
Battery Test
A battery test cycle is operator initiated or scheduled. When initiated the charger is turned off and a 24Ω
resistor provides a load to the battery for about ten seconds. If during this period the voltage drops below
10 volts a battery alarm message is sent to the host, otherwise a battery normal message is sent.
Fuse Monitoring
Besides monitoring the battery voltage the UNC100 also monitors the input voltage (DC), auxiliary voltage
(aux) and the reader voltage (reader) and reports to the host whenever the state changes.
Diagnostic LED’s
The RS485 circuit has a red and green LED to indicate when a signal is received or transmitted.
Host Comms LED is a bicolour LED when red indicates receiving data from the host and when green
indicates transmission of data.
Run LED will flash slowly when connected to the host and quickly when not connected.
Trouble LED will flash when a power problem such as a low battery or low auxiliary power is
detected.
Tamper Detection
A tamper wire may be connected to JP1 located close to the center of the board. A short to this input is
normal and an open is alarm.
RAM Memory
The static ram memory holds the database from the host (capable of handling 50k cards) that is downloaded
using Axiom software. The coin cell provides power to the memory as well as the real time clock.
Power Input / Output
Located on the top right corner of the board is a jumper that selects if the power terminals are to be used to
supply power or provide power. Select “OUT” when using a POE supply and require 13.8V @ 500ma for
other equipment.
When not using POE, the jumper should be set to “IN”.
The UNC100 controller requires 13.8VDC to be supplied from an external source. (Note: Although the
unit can run on 12VDC, you will need 13.8VDC to be able to charge backup batteries.
