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000329CG
5 - Installation
M
onitoring and control systems
The RS485 line can be used to set up a line of communication which,
when connected to a monitoring device, enables the operation of the
photovoltaic system to be kept under control. Depending on the device
used monitoring can be
local or remote
.
P
rocedure for RS485 connection to a monitoring system
Connect all the units of the RS485 chain in accordance with the daisy-
chain model in compliance with the correspondence between the si-
gnals, and activate the termination resistance of the communication line
in the final element of the chain by switching the
a05 control (to the ON
position).
The communication line must also be terminated on the first element of the chain which nor
-
mally corresponds to the monitoring device.
RS485 PC
MONITORING
SYSTEM
TRIO
POWER ALARM GFI
ESC
UP DO
WN ENTER
TRIO
POWER ALARM
GFI
ESC
UP DO
WN ENTER
TRIO
POWER ALARM GFI
ESC
UP DO
WN ENTER
1
When connecting a single inverter to the monitoring system, activate the
termination resistance of the communication line by switching the a05
control (to the ON position).
Set a different RS485 address on each inverter in the chain.
No inver-
ter can have “Auto” as an address
. An address can be freely chosen
between 2 and 63.
The setting of the address on the inverter is done through the display and
the keyboard (see the specific chapter).
It is recommended not to exceed a length of 1000m for the communication line.
The maximum number of inverters that can be connected to the same RS485 line is 62.
When a RS-485 connection is being used, if one or more inverters are
added to the system at a later time, it is necessary to remember to reset
to OFF the switch on the termination resistance being used on the inver-
ter which previously was the last in the system.
Each inverter is sent with a preset RS485 address of two (2) and with
the switch for setting the termination resistance a05 in the OFF position.