Using the Modbus RTU Protocol
The 9700 Power Meter can make any real-time data available through the
Modicon Modbus RTU protocol. Modbus Master devices connected to the
9700 Power Meter can access this data. Modbus Master devices can also
write data into registers, making device configuration changes or initializing
control actions.

The 9700 Power Meter’s Factory Modbus

Configuration

The 9700 Power Meter makes data available to Modbus Master devices
using four Modbus Slave modules. These modules are linked to other
modules in the 9700 Power Meter that provide the energy, power and
demand data. Once a communications channel is configured to use
Modbus RTU protocol (refer to “Communications Setup” in Chapter 2), the
data is available to Modbus Master devices.
measured data is linked
to Modbus module’s input
9700 Power Meter
Modbus module outputs
data in Modbus format
data is available to
Modbus Master device
Modbus Slave
Module
Power Me t er
Module
Vln a 40011
communications port is set
to Modbus RTU protocol
The data available through the Modbus Slave modules is in a specific
format, knowledge of the Modbus protocol and an understanding of the
settings used in the 9700 Power Meter are required to interpret the data
provided.
Changing the Modbus Configuration
If the factory Modbus configuration does not suit your needs, the existing
Modbus Slave modules can be relinked to other parameters that you want
to access through Modbus. There are only four Modbus Slave modules
available in the 9700 Power Meter, so you will have to delete some of the
preconfigured links if you want to make other parameters available to
Modbus Master devices.
If your Modbus Master device requires data in a format different than that
provided by the factory Modbus configuration, you can edit the setup
registers in the Modbus Slave modules. These setup registers specify the
Modbus format, scaling and base address settings.