SSW426 โมดูลแปลงและส่งสัญญาณอัตราการไหล Water Flow Sensor RS485 Modbus Converter Module

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โมดูลแปลงเครื่องวัดอัตราการไหลของน้ำ FLowmeter RS485 Modbus Converter Module

 Wiring Connector for Sensor

Communication Parameter

Baud Rate	115200 bps
Digit	8
Check Code	no
Stop Bit	1

Protocol

This protocol supports function codes 0x03, 0x06, 0x10, 0x83, 0x86, 0x90

Function Code	Function	Description
0x03	Read	Read register
0x06	Write 1 word	Set a single register
0x10	Write N word	Set multiple registers
0x83	Device error	Error while reading
0x86	Device error	Error setting single register
0x90	Device error	Error setting multiple registers

Register list

Register lists
Register	Length (bytes)	Definition	R/W	Decimal Places	Data Range	Transfer data type
0x0003	2	Baud rate	R/W	0	0-6	Unit
0x0004	2	Site number	R/W	0	0-255	Unit
0x0005	2	Flow coefficient K1	R/W	2	0-655	Unit
0x0006	4	Instantaneous flow (L/min)	R/W	4	0-99999	Unit
0x0007
0x0008	4	Total flow (L/min)	R/W	3	0-214783	Unit
0x0009
0x000A	4	Pressure	R/W	–	–	Float
0x000B
0x000C	2	Total flow save reference value	R/W	0	0-49999	Unit
0x000D	2	Reserved	R/W	0	0-49999	Unit
0x000E	4	Pressure coefficient A	R/W	–	–	Float
0x000F
0x0010	4	Pressure coefficient B	R/W	–	–	Float
0x0011
0x0088	2	Force read site number	R	0	0-255	Unit

Modbus protocol EXAMPLE 

Illustrate

• 1. Baud rate setting:
  • 0: 2400,
  • 1: 4800,
  • 2: 9600,
  • 3: 19200,
  • 4: 38400,
  • 5: 57600,
  • 6: 115200.
  • If the set value is not within this range, the default is 115200, and the device is factory-initialized to 115200.
• 2. The device defaults to the initial address of 255.
• 3. The coefficient K, if the actual K=7.5, the set value is 750, or 750*N, N is subject to the experiment. Note that when changing the value of K, The total flow will also be refreshed, and
  the total flow data before the change will be recalculated according to the new K value.
• 4. Instantaneous flow, total flow, pressure, 4 bytes must be read, addressable only from high bits, instantaneous flow output value/10000 That is, the actual instantaneous flow.
• 5. The total flow saving reference value is related to the setting of saving the total flow, when the change of the total flow = the total flow saving reference value × 60, save the total flow value once to the power-off save area. Because the read and write life of the power-off storage area is about 100,000 times, this setting requires Be cautious. For example, when the set value = 30, when the total flow changes by 1800L, the data will be saved once. If the average flow rate of the measured fluid is When it is close to 30L/min, the data is saved approximately every hour, and the service life of the power-off storage area is about ten years. 6. Pressure = A*voltage+B, pressure and pressure coefficients A and B are float data, which can be set to negative numbers and decimals. A, B It is determined by the characteristic equation of the sensor.
• 7. For all items marked with data range, when setting, if it is not within the data range, the device will report error 0x03. if on If the register read or set by the bit machine is not in the above table, the device will report error 0x02.
• 8. When setting multiple registers, if the reserved register is included, the data can be set to any value. Data in reserved registers is discarded. This register can also be used as a note area to save the data required by the customer.
• 9. 0x0088 After the host computer loses the station number of a device, it needs to send this

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• 1 โมดูลแปลงเครื่องวัดอัตราการไหลของน้ำ FLow meter RS485 Modbus Converter Module