9410 series Communications
Prerequisite Description
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.
Configuring your meter for Modbus using the display
You can use the display to configure your meter as a Modbus slave or partially
configure your meter for Modbus mastering.
NOTE: Your meter’s communications must be wired and configured before you
begin this procedure.
Your meter does not require any Modbus-specific configuration to act as a Modbus
slave device over Ethernet.
1. Navigate to Setup Menu > Communications Setup and select the serial
communications setup screen.
2. Configure the serial port’s Modbus parameters as required.
Parameter Setting
Protocol Modbus RTU or Modbus master
RS485 Bias
• Off if the meter is a Modbus slave
• On if the meter is a Modbus master
3. Configure the meter’s other serial port parameters as required.
For Modbus master, you must add the Modbus slave devices using ION Setup.
72 7EN05-0336-03
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