Communications 9410 series
See the ION Reference, available from www.usa.siemens.com/pds for further
information about ION architecture and a detailed description of the different ION
modules. See the ION Device Template Reference, available from
www.usa.siemens.com/pds, for details on the modules and their configuration in your
meter’s default template.
Modbus
Modbus is a master/slave communications protocol where the master initiates
transactions and the slave(s) responds with the requested information or action.
Your device can function as a Modbus slave or Modbus master, depending on how it is
configured. Your device comes with Modbus slave functionality configured and ready
to use. You can add custom Modbus information to the default Modbus slave data
provided by your device.
Key terms
Term Definition
Modbus gateway A communications method that lets you communicate through an
Ethernet gateway device to a Modbus serial network connected to that
device.
Modbus master A device that issues commands and receives responses from Modbus
slave devices. Serial Modbus networks can only have one Modbus
master per network.
Modbus RTU Serial Modbus protocol format; Modbus RTU transmits data using binary.
Master and slave devices must use the same format.
Modbus register/address Identifies the data to read/write. Modbus register maps are available for
Modbus slave devices and detail the information available from the slave
device. More than one register may be used to store a single value.
Modbus slave A device that responds to Modbus commands and performs actions or
provides information back to the Modbus master. Most Modbus networks
contain multiple slave devices.
Modbus TCP The Ethernet Modbus protocol format.
Modbus unit ID The identifier for a slave Modbus device.
You can download your device’s Modbus map from www.usa.siemens.com/pds and
get additional information about the Modbus protocol from www.modbus.org.
Your meter as a Modbus slave on a serial network
Your meter can function as a Modbus slave on a serial network.
A Modbus master
B RS-485 Modbus RTU
C Modbus slaves
D Your meter
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