While organizing examples, I found a communication case for the Yu Electric flow meter. The model of the flow meter was not noted, making it impossible to determine its specific model.
I can only organize and record this; those who encounter it can refer to it. It seems I need to be more careful in the future.
1. Instrument Settings – Communication Parameters
Set the communication parameters for the frequency converter. The settings in this example are as follows:
9600, 8, 1, no parity Device address: 12. Parameter Addresses
| Name | Area | Address | Read/Write | Data Type |
| Instantaneous Flow | 4 | 595 | Read Only | 32-bit Float |
| Forward Accumulation | 4 | 785 | Read Only | 32-bit Unsigned Integer |
| Extended Forward Accumulation | 4 | 777 | Read/Write | 32-bit Unsigned Integer |
| Reverse Accumulation | 4 | 789 | Read/Write | 32-bit Unsigned Integer |
| Extended Reverse Accumulation | 4 | 787 | Read/Write | 32-bit Unsigned Integer |
| Flow Unit | 4 | 66 | Read/Write | 16-bit Unsigned Integer |
| Accumulation Unit | 4 | 70 | Read/Write | 16-bit Unsigned Integer |
| Alarm | 4 | 1049 | Read Only | 16-bit Unsigned Integer |
3. Adding Modbus RTU Serial Port Driver
Add a serial port parent device, and under the parent device, add 2 Modbus RTU child devices, as shown in the figure below.
Why do we need to add 2 Modbus RTU child device drivers? This needs special mention:
During testing, it was found that the addresses for the extended reverse accumulation and reverse accumulation data are continuous. If placed under one driver, it will report an error and needs to be handled separately. This may relate to the underlying mechanism of the flow meter, but we will not delve into that here; we can simply collect them with 2 separate drivers.
4. Setting Serial Port Parameters
The serial port parameters must match those set on the frequency converter. In this example, the settings are:
5. Variable Addition and Connection as shown in the figure below:Device 0
Device 1
6. Child Device Parameter Settings
Note: The parameter settings for Child Device 0 and Child Device 1 are the same.
7. Configuration Screen
