In the property sheet of the ModbusAsyncNetwork (Figure 8), you configure the serial port/comm settings needed to communicate to attached Modbus devices, and review other default network values.
Note the ModbusAsyncNetwork 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 ModbusAsyncDevice:
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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.
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Use Force Multiple Coil
Specifies whether to use function code 15 (Force Multiple Coils) instead of function code 05 (Force Single Coil) when writing to coils. The default is false, where function code 05 (Force Single Coil) is used.
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Use Preset Multiple Register
Specifies whether to use function code 16 (Preset Multiple Registers) instead of function code 06 (Preset Single Register) when writing to registers. The default is False, where function code 06 (Preset Single Register) is used.
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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 devices.
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Modbus Data Mode
As either RTU (the default) or ASCII, depending on the type of networked Modbus devices.
Other ModbusAsyncNetwork properties such as “Retry Count”, “Response Timeout”, “Sniffer Mode”, and “Rtu Sniffer Mode Buffer Size” are typically left at defaults, unless particular reasons dictate change.
Double-click the ModbusAsyncNetwork for the default Modbus Async Device Manager view, which you can use to add new ModbusAsyncDevice children. For general information, see “About the Device Manager” in the Drivers Guide. See Modbus Async Device Manager notes for additional details.