Baud rate automatic conversion system and method supporting DLT698 protocol
A DLT698, automatic conversion technology, applied in information technology support systems, transmission systems, electrical components, etc., can solve the problems of low success rate of meter reading at the station acquisition terminal and uncertainty of the default baud rate of the smart meter 485 interface, etc. Achieve the effect of enhancing the reliability of power information collection, avoiding bus data loss, and improving the success rate of collection
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[0044] Example 1:
[0045] As attached figure 1 As shown, the baud rate automatic conversion system supporting the DLT698 protocol of the present invention includes a master station, a station collection terminal, a 485 repeater, and a smart meter. The master station and the station collection terminal are connected via Ethernet, and the station collection The terminal is connected with the 485 repeater through the RS-485 interface, and the 485 repeater is connected with the smart meter through the RS-485 interface. The field station collection terminal reads the data of the smart meter supporting the DLT698 protocol through the 485 repeater regularly, and will read The read smart meter data is regularly uploaded to the master station via Ethernet.
[0046] Among them, there are multiple 485 repeaters and smart meters, and the 485 repeaters and smart meters are set in one-to-one correspondence; the 485 repeater supports the identification of the 485 interface communication of the s...
Example Embodiment
[0048] Example 2:
[0049] The method for automatically converting the baud rate supporting the DLT698 protocol of the present invention is specifically as follows:
[0050] (1) Power-on operation of the 485 repeater, and initialize the 485 bus on the collecting terminal side of the station and the smart meter side;
[0051] (2) The 485 repeater actively sends DLT698.45 data frames to the smart meter at a baud rate of 2400 / 4800 / 9600 to query the meter address; if the smart meter responds correctly, record the current baud rate and set the smart meter side The 458 bus interface is set to this baud rate;
[0052] (3) The receiving pin of the 485 bus driver serial port of the 485 repeater and the field station acquisition terminal side is set to input interrupt mode, and the shortest low level duration of the serial port signal level sent by the field station acquisition terminal to the repeater is recorded Time, calculate the baud rate according to 1bit time, and get the baud rate of t...
Example Embodiment
[0055] Example 3:
[0056] As attached image 3 As shown, the specific implementation steps of the present invention are as follows:
[0057] S1, 485 repeaters are powered on and run, and the 485 bus on the collecting terminal side and smart meter side of the station is initialized;
[0058] The S2, 485 repeater actively sends DLT698.45 data frames to the smart meter at a baud rate of 2400 / 4800 / 9600 to query the meter address;
[0059] S3. Determine whether the smart meter responds correctly:
[0060] ①. If the smart meter responds correctly, proceed to step S4;
[0061] ②. If the smart watch fails to reply correctly, skip to step S2;
[0062] S4. Record the current baud rate, and set the 458 bus interface on the side of the smart meter to the baud rate;
[0063] S5. Configure the serial port receiving pin on the collection terminal side of the field station to the falling edge interrupt mode, turn on the MCU built-in timer, and wait for the station collection terminal to send the meter r...
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