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742.221 | 12.04
EN
The following optionally available devices support the transfer protocol used by the inverter:
• StecaGrid Vision remote display: Display of the data from inverters connected to the RS485 bus.
• PC or notebook (with suitable software, for technical professionals only):
– Load firmware updates
– Read inverter information using Steca service software
– An optional RS485/USB adapter for connecting to the inverter is also available. The adapter is
available from Steca.
• External data loggers, recommended by Steca for professional system monitoring:
– StecaGrid Monitor
– WEB‘log (Meteocontrol)
– Solar-Log (Solare Datensysteme)
Note
The correct settings must be made in external data loggers, according to the manufacturer's instruc-
tions, before connecting them to the bus.
The wiring diagram of the RS485 bus is shown below.
1
2
3
4
5
5
5
RS485
RS485 RS485
Fig. 6: Wiring diagram, using the StecaGrid Vision as an illustrative example
StecaGrid Vision or external data logger (in fig.: StecaGrid Vision)
First inverter
Inverter
Last inverter, terminated
Standard RJ45 cable (patch cable)
7.6.3 Alternative data connection cable
Caution
Material damage caused by electrical voltage! The alternative data connection cable may only be
manufactured by professional personnel.
The alternative data connection cable is a Cat-5 cable for long data connections. The following ap-
plies to the alternative data connection cable:
• The total length of the RS485 bus must not exceed 1,000 m (Master/first inverter to last inverter).
• The pin assignment is 1:1, if the alternative data connection cable is used to connect the RJ45
sockets of inverters and the StecaGrid Vision.
• The pin assignment is according to Tab. 8, p. 57, if the alternative data connection cable
is used to connect the RJ45 socket of the first inverter to the COMBICON connector of the
StecaGrid Vision or to the connector of an external data logger.
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