Last modified by Karry Zhuang on 2024/07/11 11:58
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... ... @@ -562,6 +562,80 @@ 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 565 565 566 -* **Specific steps**: RS485-LN with ultrasonic flow meter 567 -* 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. 576 + 577 +[[image:1720669933691-331.png]] 578 + 579 + 580 +M62 sets 9600, none, 1 581 + 582 +[[image:1720669981767-254.png]] 583 + 584 + 585 +M63 sets automatic 586 + 587 +[[image:1720670003601-544.png]] 588 + 589 + 590 +=== 1.9.2 Setting Dragino RS485-LN === 591 + 592 + 593 +The RS485-LN wiring port is as shown below. Connect the power supply and RS485 A/B line according to the diagram. 594 + 595 +[[image:1720670016539-422.png]][[image:1720670019136-658.png]] 596 + 597 + 598 +=== 1.9.3 Connect the RS485-LN to Ultrasonic Flowmeter === 599 + 600 + 601 +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. 602 + 603 +[[image:1720670035661-234.png]][[image:1720670041974-372.png||height="417" width="436"]] 604 + 605 + 606 +=== 1.9.4 Full wiring example === 607 + 608 + 609 +The yellow wire connects port 26 and port A of RS485-LN. 610 + 611 +The green wire connects port 27 and port B of RS485-LN. 612 + 613 +[[image:1720670079781-764.png]] 614 + 615 + 616 +=== 1.9.5 How to read ultrasonic flow meter data via RS485 === 617 + 618 + 619 +[[image:1720670090204-634.png]] 620 + 621 + 622 +For example, I want to read Positive 623 + 624 +Through M02, we can see that the POS data is 54.9862 625 + 626 +[[image:1720670103571-173.png]][[image:1720670108127-723.png||height="597" width="645"]] 627 + 628 +Registers are 9-12, so the read command is AT+CFGDEV=01 03 00 08 00 04,1(,1 is used for automatic complement) 629 + 630 +[[image:1720670123955-149.png]] 631 + 632 + 633 +00 36 00 00 is the integer of the read value 634 + 635 +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 79 636 + 637 +Conversion and parsing website:http:~/~/www.speedfly.cn/tools/hexconvert/ 638 + 639 +[[image:1720670134750-980.png]] 640 + 641 +
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