Ultrasonic Flow Meter Newsletter Q&A

Abstract: Ultrasonic flow meter communication question and answer information is provided to you by excellent flow meter and flow meter production and quotation manufacturers. Q&A on communication issues with ultrasonic flowmeters: Q: Why can't I connect to the flowmeter? , it doesn't do anything after connecting it? Answer: A. Check whether the serial port parameters match; whether the protocol selection in the M63 window is correct B. Check the physical wiring is. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the ultrasonic flowmeter communication question and answer article. Questions and answers about communication with ultrasonic flowmeters:•Q: Why can't I connect to the flow meter? , it doesn't do anything after connecting it? Answer: A. Check whether the serial port parameters match; whether the protocol selection in the M63 window is correct B. Check whether the physical connection is well connected D. Whether the address in the M46 window is set correctly C. Power the flowmeter back on and you should be able to receive the characters“AT”, otherwise there is a problem in steps A and B. D. Check that the command is correct. When using the extended protocol, the command should be followed by a carriage return•Q: Why is the value read by MODBUS in a mess and completely inconsistent with the displayed value? Answer: Generally speaking, if the MODBUS protocol can read data, it means that there is no problem with the protocol itself. The messy data is due to the following errors: A. The data format is wrong; B. The register address is wrong, resulting in the displacement of the data and an error. For example, real variables such as REAL4 (single-precision floating-point numbers in IEEE754 format) have 4 different arrangements according to words and bytes. TDS100 uses the most conventional one, that is, the low word and high byte format. You can solve this problem by modifying the data storage format of your software. If a general configuration software is used, the configuration software generally has a method for selecting the format.•Q: My system requires only one command every 1 hour and then requires multiple variables to be received at the same time, which protocol should I use? A: One MODBUS command can read many variables at one time. If MODBUS-RTU cannot solve the problem, you can use“&”The Haifeng extension protocol for linking symbols. It is also possible to use a simple compatible protocol, or the Meter-BUS protocol.•Q: Why is the value read through the protocol inconsistent with that displayed by the flow meter? Answer: A. Confirm whether the variable address is the one you require? Because there are too many variables inside the flowmeter, is it confusing? Note that when reading data, REG0001 is represented as 0000 in the command string instead of 0001. 0001 in the command string means to read the content of REG0002. b. For accumulators, only 7 decimal digits can be displayed, and 8 decimal digits can be read out through the MODBUS protocol. In this case, the last 7 digits of the read value are the same.•Q: My system cannot support long integer and real variable formats, what should I do? A: You need to use the numerical conversion method, or find a new driver to solve it.•Q: Is there a test program for MODBUS? Answer: Yes! It is recommended to use the MODSCAN software, which can be found on the Internet. This program is very convenient and helps to easily check the read data and understand the meaning of various types of data.•Q: Does the flow meter have a simulated operating state to facilitate testing, and how to set it? Answer: Yes! Entering a value of 0 in the M11 window starts the simulation running state. In the simulation running state, the flow velocity is always set to 1.2345678m/s, the instantaneous flow rate is equal to 0, and the display“R”state. If the instantaneous flow is required to be the set value, this can be achieved by entering a negative set value in the M44 window. For example, enter -3600 m3/s in the M44 window. Instantaneous flow will be displayed as 3600 cubic meters per second. At this time, all accumulators will also accumulate accordingly. Thus, a variable cumulant output is obtained. Using this function, it is very convenient to debug the network software and test the function of the flowmeter without connecting the sensor.•Q: When using C, what is the order in which floating-point numbers are stored? Answer: For example, the four bytes of 3F9E0651 are 1.2345678 single-precision floating-point form in IEEE754 format. The sequence in the MODBUS data stream is 06513F9E, and the 1st address data stream should be F9E3B32 (hexadecimal digits). When using C language in an X86 computer, 51069E3F are stored in the order of memory from low to high. Another example is to read the net accumulation register REG25 and REG26. The two register commands are as follows: 010300180002440C (hexadecimal number) The returned data should be (set net accumulator = 802609, its 4-byte hexadecimal representation is 000C3F31) 0103043F31000CA7ED (ten Hexadecimal numbers, A7ED is the checksum. Please visit Nanjing Nengzhao Technology for the specific model and related information of the ultrasonic flowmeter. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Ultrasonic Flow Meter Newsletter Questions and Answers'
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