SY-SIX-PX8 | Synergis IX DIN Rail 8 Form C Relay Output Expander | Installation Manual
Last Updated July 2018
11
DC Power & Encrypted Module Network
The Output Expander incorporates encrypted RS-485 communications technology, and both module and
network power are supplied by the N+ and N- terminals.
NA
N+
N-
NB
Network communications input
from the Controller or previous
module
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 Output Expander or 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.
End of Line Resistors:
330R
330R
First Module on RS-485 Network
Last Module on RS-485 Network
To
Next
Module
From
Previous
Module
NA
N+
N-
NB
NA
N+
N-
NB
