8
7.
Connect other end of shielded twisted-pair wire to the Secondary RS-485 terminals
on the Aurora Logger. Use the table below and the figure on the next page to make the
proper connections. See Section 4 for more information on wiring the optional
weather station to the Aurora Logger.
RS-485 Screw Terminal
RS-485 Connection
Aurora Logger RS-485
Screw Terminal Connector
Example Aurora Inverter
RS-485 Pin Label
RS-485 Negative (-) 1
-TR (Port 5)
RS-485 Positive (+) 2
+TR (Port 4)
RS-485 Negative (-) 3
-----
RS-485 Positive (+) 4
----
Ground
5
RTN (Port 3)
VDC Power Only
6
----
8.
For systems with multiple Power-One inverters, the RS-485 network must be
terminated at the final inverter by a switch near the RS-485 terminal block. The
farthest inverter in the daisy chain must be terminated by setting the inverter
termination switch to ON. For all other inverters in the daisy chain, turn OFF the
termination switch. Below are pictures of RS-485 terminals in various Power-One
inverters, as well as locations of the termination switch.
1
In some environments you may experience poor RS-485 signal strength due to noise. If signal strength is a
problem, double-check that the last inverter in the chain is terminated and other inverters are not terminated. If
problems persist, it may prove helpful to attach
a 120 Ohm 0.5 Watt resistor across screw terminals 1 and 2 on
the Aurora Logger.
+12VDC Power, Port 6
Ground, Port 5
Secondary RS-485
Connectors, Terminal 1(D-)
and Terminal 2 (D+)