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Protect PV.250 Operating Instructions
Page 35 of 51 80000027023 BAL, en
6.2 COM Server
6.2.1 General
The COM server makes the serial port of the PV inverter available
via an Ethernet network. A software application can communicate
with the PV inverter via the network using a virtual COM port (this
needs to be installed on a server or a workstation). The COM
server is installed as standard and is used by the AEG service de-
partment for remote maintenance purposes. An appropriate
Ethernet network with an Internet connection and a fixed IP ad-
dress assignment is required here.
An assembly made by W&T is used as the COM server. It is an in-
dustrial version for 10 Mbit and 100 Mbit Ethernet networks. The
COM server is item A27 in the system's AC cabinet; see Figure 4.
6.2.2 Network Connection
This COM server has an IEEE 802.3-compatible network connec-
tion on a shielded RJ45 plug connector. Its assignment corre-
sponds to that of an MDI interface, which means the connection to
the hub or switch is made using a 1:1 wired patch cable.
Ex-works, the COM server operates in an autonegotiation mode on
the network side. This means the data transmission speed and the
duplex process are automatically negotiated with the connected
switch or hub and are set accordingly.
6.2.3 COM Port
Ex-works, the COM port is set so it can communicate directly with
MultiCom interface connector X2 of the PV inverter via RS-232.
6.2.4 Power Supply
The power supply is connected at the screw terminal blocks lo-
cated on the underside of the housing. A DC voltage of any polar-
ity may be used. The protection against polarity reversal means
the following maximum and minimum values apply to the supply
voltage:
12 VDC (-10%) – 24 VDC (+10%)
A corresponding switch mode power supply in the PV inverter
supplies the COM server with power.
35


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