PRT-RDM2-PCB
Protege Mini 2 Reader Expander
Installation Manual | March 2015
7
2.3
DC Power and Encrypted Module Network
The Reader Expander incorporates encrypted RS-485 communications technology, and both module and
network power are supplied by the N+ and N- terminals.
Network communication
s
input
from the Protege Integrated
S
y
s
tem Controller or previou
s
Protege module
N+
N-
NA
NB
TP
TP
Standard Communication Connection
Connection of the communications and DC supply should be performed according to the diagram shown
above. It is important that the N+ Network Communications Power be 12VDC supplied from an independent
battery backed power supply unit such as the PRT-PSU-DIN or a networked module capable of supplying the
required voltage to all devices on the RS485 network.
Warning:
The 12V N+ and N- Communication input must be supplied from only ONE point. Connections
from more than one 12V supply may cause failure or damage to the Reader Expander or device
supplying network power.
Under no circumstances should you power the locking devices that are connected to the Reader
Expander from the N+ and N- network communication power supply. A separate power supply
MUST be used to power the locking devices.
EOL OFF
EOL ON
EOL Jumper
i
The EOL (End Of Line) jumper should be placed in the ON position when the Reader Expander is
inserted as the FIRST or LAST module on the RS485 network. EOL is ON when the jumper is placed
closest to the EOL text.