You can use ION Setup to create an Ethernet gateway site and access the serial network of
devices connected through the EtherGate meter.
Modbus Ethernet gateway
A Modbus Ethernet gateway allows multiple Modbus client devices on the LAN/WAN to connect
to downstream serial Modbus server devices.
A Modbus client device, such as an energy management system, can communicate through the
gateway meter to a serial network of devices connected to the gateway meter’s serial port(s). The
meter receives Modbus TCP/IP data on TCP port 502, translates it to Modbus RTU then forwards
it to the addressed server device.
This functionality allows the use of monitoring software to access information from server devices
for data collection, trending, alarm/event management, analysis, and other functions.
Modbus Ethernet gateway implementation
There are some specific aspects to your meter’s Modbus Ethernet gateway implementation.
A Modbus request is sent through Ethernet using Modbus/TCP to the gateway meter. If this
request is addressed with the slave ID of one of the downstream serial devices, the meter
forwards the message to that device using Modbus RTU. When the downstream device
responds, the gateway meter forwards the response back to the Modbus client. In addition to
Modbus server addresses 1 to 247, the Modbus gateway supports server address 255, which
sends a Modbus request to the gateway meter only.
For Modbus gateway, you must install the serial Modbus server devices, configure them and
connect them to your Ethernet-connected Modbus gateway meter. Ensure that each serial device
is configured to communicate over Modbus with the same baud rate and has a unique unit ID.
Configure the gateway meter’s serial port to use the Modbus Master protocol and enable the
Modbus gateway feature, create a Modbus gateway site in ION Setup or an energy management
system, and add the serial devices to the Modbus gateway site.
NOTE: Modbus Ethernet gateway supports up to 32 Modbus TCP connections.
Configuring a Modbus gateway using ION Setup
You can configure Modbus gateway on your meter using ION Setup.
Before you begin, make sure you have completed the following tasks:
•
Confirm the serial network of devices are wired and configured to have the same baud rate,
serial port settings (for example, 8N1), and protocol (Modbus).
•
Confirm each serial device has a unique unit identifier.
•
Confirm the serial network of devices are connected to the gateway meter’s serial
communication port.
•
Confirm your gateway meter is communicating over Ethernet.
9810 series - User manual Communications
7EN05-0390-08 112
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