Last modified by Karry Zhuang on 2024/07/11 11:58
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... ... @@ -562,70 +562,6 @@ 562 562 It shows how to use RS485-LN to connect to an ultrasonic flow meter and read the data from the ultrasonic flow meter. 563 563 564 564 565 -Need to prepare RS485-LN, recharger, Electric wire 566 566 567 -[[image:1720669739434-926.png]] [[image:1720669744315-613.png]] 568 - 569 - 570 -=== 1.9.1 Setting Ultrasonic Flowmeter === 571 - 572 - 573 -Adjust the M option corresponding to the ultrasonic flowmeter as follows 574 - 575 -M52 sets RS485 Port M62 sets 9600, none, 1 M63 sets automatic 576 - 577 -[[image:1720669933691-331.png]][[image:1720669981767-254.png||height="550" width="412"]][[image:1720670003601-544.png||height="550" width="412"]] 578 - 579 - 580 -=== 1.9.2 Setting Dragino RS485-LN === 581 - 582 - 583 -The RS485-LN wiring port is as shown below. Connect the power supply and RS485 A/B line according to the diagram. 584 - 585 -[[image:1720670016539-422.png]][[image:1720670019136-658.png]] 586 - 587 - 588 -=== 1.9.3 Connect the RS485-LN to Ultrasonic Flowmeter === 589 - 590 - 591 -According to the instructions of the ultrasonic flow meter, 26 and 27 are the + and - of RS485, corresponding to the A and B ports of RS485. 592 - 593 -[[image:1720670035661-234.png]][[image:1720670041974-372.png||height="417" width="436"]] 594 - 595 - 596 -=== 1.9.4 Full wiring example === 597 - 598 - 599 -The yellow wire connects port 26 and port A of RS485-LN. 600 - 601 -The green wire connects port 27 and port B of RS485-LN. 602 - 603 -[[image:1720670079781-764.png]] 604 - 605 - 606 -=== 1.9.5 How to read ultrasonic flow meter data via RS485 === 607 - 608 - 609 -[[image:1720670090204-634.png]] 610 - 611 - 612 -For example, I want to read Positive 613 - 614 -Through M02, we can see that the POS data is 54.9862 615 - 616 -[[image:1720670103571-173.png]][[image:1720670108127-723.png||height="597" width="645"]] 617 - 618 -Registers are 9-12, so the read command is AT+CFGDEV=01 03 00 08 00 04,1(,1 is used for automatic complement) 619 - 620 -[[image:1720670123955-149.png]] 621 - 622 - 623 -00 36 00 00 is the integer of the read value 624 - 625 -78 79 3f 7c is a decimal, but it needs to be converted and parsed into floating point. The parsing order is CDAB, which is 3f 7c 78 79 626 - 627 -Conversion and parsing website:http:~/~/www.speedfly.cn/tools/hexconvert/ 628 - 629 -[[image:1720670134750-980.png]] 630 - 631 - 566 +* **Specific steps**: RS485-LN with ultrasonic flow meter 567 +*
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