Communications
9410 series
Fixed and configurable Modbus map
Your device has a fixed (static) register map for meter data and a flexible, user-
configured register map.
Modbus security
Your meter’s onboard security options include Modbus-specific settings. These
security settings may need to be configured in order to write Modbus data to the meter.
Modbus best practices for serial
In order for your meter to operate as a serial Modbus device, you must complete some
prerequisite configuration.
Prerequisite
Description
Wiring
The device’s serial connection must be wired correctly.
The Modbus slave devices must have communications wiring to the Modbus
master.
Protocol
Slave: for your meter to be a serial Modbus slave, the meter’s protocol must be set
to Modbus RTU. Master and slave devices must use the same format.
Master: for your meter to be a serial Modbus master, the meter’s protocol must be
set to Modbus Master.
Baud rate
The baud rate must be the same for all devices on the serial Modbus network.
Stop bits and
parity
The communication stop bits and parity (for example, 8N1) must be the same for all
devices on the serial Modbus network.
Unit ID
Each device on the serial Modbus network must have a unique unit ID (also called
the device address).
Modbus best practices for Ethernet
In order for your meter to operate as an Ethernet Modbus device, you must complete
some prerequisite configuration.
NOTE:
You do not need to perform any Modbus-specific configuration for your meter
to function as a Modbus slave device over Ethernet.
Prerequisite
Description
Ethernet
All devices must have a working Ethernet connection.
IP address
All devices must have a unique IP address.
Port
All devices must be communicating over Ethernet port 502 for Modbus TCP.
NOTE:
Devices supporting multiple simultaneous Modbus TCP connections can have
communications delays. Adjust your network timeout settings to accommodate this.
Modbus master best practices
In order for your meter to operate as a Modbus master, you must complete some
prerequisite configuration.
NOTE:
These settings are required in addition to the serial or Ethernet Modbus
prerequisites.
7EN05-0336-01
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