In the property sheet of the ModbusSlaveNetwork (Figure 19), you configure the serial port/comm settings needed to communicate to the attached Modbus master, and review other default values.
Note the ModbusSlaveNetwork has the standard collection of network components, such as for status, health, monitor, tuning policies, and poll scheduler. For more details, see “Common network components” in the Drivers Guide.
In addition, the following properties have special importance:
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“Global” Modbus device defaults, which (as needed) can be overridden in the Modbus Config (client device level) slot of any child ModbusSlaveDevice:
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Float Byte Order
Specifies the byte-order used to assemble or receive floating-point (32-bit) values in messages.
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Long Byte Order
Specifies the byte-order used to assemble or receive long integer (32-bit) values in messages.
By default Niagara supports Modbus function codes 15 and 16 (Force Multiple Coils, Preset Multiple Registers), so you do not
see these selections like you do in a client Modbus network.
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Serial Port Config
The container slot in which you specify the serial port/communications setup required to talk to attached serial Modbus master.
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Modbus Data Mode
As either Rtu (the default) or Ascii, depending on the type of networked Modbus master.
The other ModbusSlaveNetwork property “Sniffer Mode” is typically left at default, unless particular reasons dictate change.
Double-click the ModbusSlaveNetwork for the default Modbus Slave Device Manager view, which you can use to add one or more ModbusSlaveDevice children. For general information, see “About the Device Manager” in the Drivers Guide. See Modbus Slave Device Manager notes for additional details.