Siemens 9810 Series, User Manual, Page: 46 / 218

Communications
Your meter as a Modbus master
Your meter as a Modbus master with Ethernet Modbus slave devices
Your meter can function as a Modbus master with Ethernet Modbus slave devices.
A. Ethernet
B. Your meter
C. Modbus slaves
For Modbus mastering, you must add the Modbus slave devices using ION Setup.
Your meter as a Modbus master with serial Modbus slave devices
Your meter can function as a Modbus master with serial Modbus slave devices.
A. Ethernet
B. Your meter
C. RS-485 Modbus RTU
D. Modbus slaves
For Modbus mastering, you must add the Modbus slave devices using ION Setup.
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.
Prerequisite Description
Modbus slave
devices All Modbus slave devices must be communicating and appropriately
configured.
Protocol • Modbus mastering serial devices: the master’s serial port protocol must
be set to Modbus master.
• Modbus mastering Ethernet devices: the master must be communicating
to the slave devices over Ethernet port 502.
NOTE: Having more than one Modbus master on a serial Modbus network
may cause communication conflicts.
Mastered
devices The Modbus master device must have the slave device information entered for
mastering.
Configuring your meter as a Modbus master using ION Setup
You can configure your device to Modbus master slave devices over serial or
Ethernet.
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