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DC Power & Encrypted Module Network
The expander incorporates encrypted RS-485 communications technology, and both module and network power
are supplied by the N+ and N- terminals.
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 capable of supplying the required voltage to all devices on the RS-485 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 unit or the device supplying network power.
⦁
The 330 ohm EOL (End of Line) resistor provided in the accessory bag must be inserted between the NA
and NB terminals of the first and last modules on the RS-485 network. These are the modules physically
located at the ends of the RS-485 network cabling.
First Module on RS-485 Network
N+
N-
NA
NB
PRT-PX8-DIN | Protege DIN Rail 8 Output Expander | Installation Manual
End of Line Resistors:
330R
To
Next
Module
Network communications input
from the Controller or previous
module
Last Module on RS-485 Network
N+
From
Previous
Module
N-
NA
NB
330R
11
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