User Manual Q&AAnswer
Feb 25, 2025 - 03:53 AM
To connect the LSI DNA921 Combined Cups and Vane sensor to your data acquisition system using the Modbus communication protocol, follow these steps:
1. Power the instrument according to the technical specifications mentioned in the manual. Make sure the power supply is within the specified range of 10-30 Vdc/Vac.
2. Connect the RS-485 communication line and sensors using a 7-wire shielded cable. The cable should be of DWA510/525/526/527 type. Refer to the connection details provided in the manual and use the wire colors mentioned in the table.
3. Configure the communication parameters of your data acquisition system to match the settings of the sensor. The default settings for the sensor are as follows:
- Bit rate: 9600 bps
- Parity: Even
- Stop bits: 1
4. Use a terminal emulation program (e.g., Windows HyperTerminal) or any other compatible program to access the sensor's functions. Connect your PC's serial line to the sensor's serial line using USB/RS-232 and RS-232/RS-485 adapters.
5. Configure the terminal program with the following settings:
- Bit rate: 9600 bps
- Parity: Even
- Terminal mode: ANSI
- Echo: Disabled
- Flow control: None
6. Once connected, you can access the sensor's functions through the terminal program's menu interface. Press the hash character (#) until the main menu appears on the terminal window. The main menu options include:
- About this device...
- Communication parameters
- Save configuration
- Restart system
- Data Tx
7. Select the "Communication parameters" option from the main menu to program the parameters for communication between the sensor and your data acquisition system. You can modify the bit rate, parity, stop bits, and network address as required.
8. Select the "Save configuration" option to store any changes you made to the parameters. This step is important to make the changes effective.
9. Restart the system either by power cycling the sensor or using the "Restart system" option from the main menu. This step is necessary to apply the configuration changes.
10. You can now use Modbus commands (e.g., Read holding registers, Read input registers) to access the acquired data from the sensor. Refer to the Modbus protocol section in the manual for more details on the available commands and the address map for different measurements.
Note: It is recommended to refer to the complete manual for detailed instructions and further information on programming, troubleshooting, and maintenance of the LSI DNA921 Combined Cups and Vane sensor.
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