Instruction Manual

Chapter 2 Operating the EM720
Communicating with the EM720
EM720 Power Quality and Revenue Meter 27
Ethernet Connection
An optional 10/100Base-T Ethernet/USB module provides a
direct connection of the EM720 to the Ethernet.
The port has two indication LEDs that operate as follows:
LED Color Status Description
LINK Green Lights The good link is detected (slightly blinks
when the port receives or transmits data)
ACT Red Blinks Activity on the port - the port receives or
transmits data
The EM720 provides two TCP servers configured for the
Modbus/TCP (on port 502) and DNP3.0/TCP (on port 20000)
communications.
The TCP servers support 5 simultaneous Internet connections
with client applications. Connection through the Ethernet port
does not require device identification. The meter responds to
any device address and returns the received address in the
response message.
The meter also provides three TCP clients:
• SNTP client for periodic synchronization of the meter
clock with a publicly available SNTP server (see
Setting-Up SNTP Client
)
• eXpertPower
TM
client for communications with the
proprietary eXpertPower
TM
server (see Setting-Up
eXpertPower Client)
• TCP notification client that can establish connections
with a remote Modbus/TCP server and send
notification messages either on events, or periodically
on a time basis (see Setting-Up TCP Notification Client
)
See Setting Up the Ethernet
in Chapter 5 on how to configure
your Ethernet port.
You can check the Ethernet port MAC address and present IP
address setting via the Device Info display (see Device Info
Display in Chapter 3).