Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 60.1 >
edited by Bei Jinggeng
on 2022/07/14 17:16
To version < 27.3 >
edited by Xiaoling
on 2022/05/27 09:37
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1 -XWiki.Bei
1 +XWiki.Xiaoling
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1 -**Table of Contents:**
1 +(% class="wikigeneratedid" %)
2 + **Contents:**
2 2  
3 3  {{toc/}}
4 4  
6 += 1. Introduction =
5 5  
6 -
7 -
8 -
9 -
10 -= **1. Introduction** =
11 -
12 -
13 13  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
14 14  
10 +== 1.1 Example 1: Connect to Leak relay and VFD ==
15 15  
16 -== **1.1 Example 1: Connect to Leak relay and VFD** ==
17 -
18 -
19 19  This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to Relay and VFD and communicate with Mobile. The structure is like below:
20 20  
21 21  [[image:image-20220527091852-1.png]]
... ... @@ -29,44 +29,36 @@
29 29  Connection
30 30  
31 31  
32 -(% style="color:blue" %)**Related documents:**
25 +Related documents:
33 33  
34 -* System Structure:  [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
35 -* Explanation on how to integrate to Node-red and to the Mobile Phone, and with link to the Github code:  [[Configure Manual>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
27 +* [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
28 +* [[Configure Manual>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : Explanation on how to integrate to Node-red and to the Mobile Phone, and with link to the Github code.
36 36  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
37 37  
31 +== 1.2 Example 2: Connect to Pulse Counter ==
38 38  
39 -== **1.2 Example 2: Connect to Pulse Counter** ==
40 -
41 -
42 42  This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to Pulse Counter and communicate with Mobile. This example and example 2 compose the structure for a farm IoT solution. The structure is like below:
43 43  
44 -
45 45  [[image:image-20220527092058-3.png]]
46 46  
47 47  Connection
48 48  
49 49  
50 -
51 51  [[image:image-20220527092146-4.png]]
52 52  
53 53  Connection
54 54  
55 -
56 -(% style="color:blue" %)**Related documents:**
57 -
58 -* Configure Document:  [[Pickdata MIO40 water pulse counter to LoRa with Dragino RS485-LN>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Pulse-Counter/||_mstmutation="1"]]
44 +* [[Pickdata MIO40 water pulse counter to LoRa with Dragino RS485-LN>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Pulse-Counter/]] : Configure Document
59 59  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
60 60  
47 +== ==
61 61  
62 -== **1.3 Example3: Use RS485-LN with energy meters** ==
49 +== 1.3 Example3: Use RS485-LN with energy meters ==
63 63  
51 +=== 1.3.1 OverView ===
64 64  
65 -=== **1.3.1 OverView** ===
66 -
67 -
68 68  (((
69 -(% style="color:red" %)**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
54 +**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
70 70  )))
71 71  
72 72  (((
... ... @@ -78,11 +78,8 @@
78 78  Connection1
79 79  
80 80  
81 -
82 82  (((
83 -(% style="color:blue" %)**How to connect with Energy Meter：**
84 -
85 -
67 +How to connect with Energy Meter：
86 86  )))
87 87  
88 88  (((
... ... @@ -115,16 +115,17 @@
115 115  Connection3
116 116  
117 117  
100 +=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
118 118  
119 -=== **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
120 -
121 -
122 122  If the user needs to read the parameters of the electric energy meter and use the modbus command,please refer to the appendix of the MODBUS communication protocol in the user manual of the energy meter.
123 123  
124 -[[image:image-20220601143257-10.png]]
104 +[[image:image-20220527092629-8.png]]
125 125  
126 126  
127 -(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
107 +(% class="box infomessage" %)
108 +(((
109 +**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
110 +)))
128 128  
129 129  * The first byte : slave address code (=001～247)
130 130  * The second byte : read register value function code
... ... @@ -133,12 +133,12 @@
133 133  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
134 134  
135 135  (((
136 -
137 -
138 -
139 139  How to parse the reading of the return command of the parameter：
120 +)))
140 140  
141 -(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
122 +(% class="box infomessage" %)
123 +(((
124 +**Example:** RETURN1：01 03 02 08 FD 7E 05
142 142  )))
143 143  
144 144  * The first byte ARD: slave address code (=001～254)
... ... @@ -151,28 +151,22 @@
151 151  (% class="wikigeneratedid" %)
152 152  (((
153 153  
154 -
155 -
156 -
157 157  )))
158 158  
159 -=== **1.3.3 How to configure RS485-LN and parse output commands** ===
139 +=== 1.3.3 How to configure RS485-LN and parse output commands ===
160 160  
161 -
162 162  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
163 163  
164 164  
144 +==== 1.3.3.1 via AT COMMAND: ====
165 165  
166 -==== **1.3.3.1 via AT COMMAND** ====
146 +First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
167 167  
168 -
169 -First, we can use (% style="color:blue" %)**AT+CFGDEV**(%%) to get the return value, and we can also judge whether the input parameters are correct.
170 -
171 171  (((
172 172  If the configured parameters and commands are incorrect, the return value is not obtained.
173 173  )))
174 174  
175 -[[image:image-20220601143201-9.png]]
152 +[[image:image-20220527092748-9.png]]
176 176  
177 177  AT COMMAND
178 178  
... ... @@ -179,33 +179,31 @@
179 179  
180 180  (% class="box infomessage" %)
181 181  (((
182 - (% _mstmutation="1" %)**AT+DATACUTx **(%%):  This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
159 + AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
183 183  )))
184 184  
185 -a:  length for the return of AT+COMMAND
162 +a: length for the return of AT+COMMAND
186 186  
187 -b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
164 +b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
188 188  
189 -c:  define the position for valid value.
166 +c: define the position for valid value.
190 190  
191 -[[image:image-20220601143115-8.png]]
168 +[[image:image-20220527092936-10.png]]
192 192  
193 193  AT COMMAND
194 194  
195 195  
196 -
197 197  PAYLOAD is available after the valid value is intercepted.
198 198  
199 199  
200 -[[image:image-20220601143046-7.png]]
176 +[[image:image-20220527093059-11.png]]
201 201  
202 202  AT COMMAND
203 203  
204 204  
205 -
206 206  You can get configured PAYLOAD on TTN.
207 207  
208 -[[image:image-20220601143519-1.png]]
183 +[[image:image-20220527093133-12.png]]
209 209  
210 210  (((
211 211  AT COMMAND
... ... @@ -216,52 +216,46 @@
216 216  )))
217 217  
218 218  (((
219 -(% style="color:blue" %)**Example**:
220 -
221 -(% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
194 +**Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
222 222  )))
223 223  
224 224  (((
225 -RETURN1: 01 03 02 00 02 39 85 00 00(return data)
198 +RETURN1:01 03 02 00 02 39 85 00 00(return data)
226 226  )))
227 227  
228 228  (((
229 -AT+DATACUT1: 9,1,4+5+6+7 Take the return value 00 02 39 85 as the valid value of reading current data and used to splice payload.
230 -
231 -
202 +AT+DATACUT1:9,1,4+5+6+7 Take the return value 00 02 39 85 as the valid value of reading current data and used to splice payload.
232 232  )))
233 233  
234 234  (((
235 -(% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
206 +CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
236 236  )))
237 237  
238 238  (((
239 -RETURN2: 01 03 02 08 DC BE 1D(return data)
210 +RETURN2:01 03 02 08 DC BE 1D(return data)
240 240  )))
241 241  
242 242  (((
243 -AT+DATACUT2: 7,1,4+5 Take the return value 08 DC as the valid value of reading voltage data and used to splice payload.
244 -
245 -
214 +AT+DATACUT2:7,1,4+5 Take the return value 08 DC as the valid value of reading voltage data and used to splice payload.
246 246  )))
247 247  
248 248  (((
249 -(% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
218 +CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
250 250  )))
251 251  
252 252  (((
253 -RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
222 +RETURN3:01 03 04 00 00 00 44 FA 00(return data)
254 254  )))
255 255  
256 256  (((
257 -AT+DATACUT3: 9,1,4+5+6+7 Take the return value 00 00 00 44 as the valid value of reading total active energy data and used to splice payload.
226 +AT+DATACUT3:9,1,4+5+6+7 Take the return value 00 00 00 44 as the valid value of reading total active energy data and used to splice payload.
258 258  )))
259 259  
260 260  (((
261 -Payload: 01 00 02 39 85 08 DC 00 00 00 44
230 +Payload:01 00 02 39 85 08 DC 00 00 00 44
262 262  )))
263 263  
264 -[[image:image-20220601142936-6.png]]
233 +[[image:image-20220527093204-13.png]]
265 265  
266 266  AT COMMAND
267 267  
... ... @@ -268,16 +268,13 @@
268 268  
269 269  (% style="color:#4f81bd" %)**01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.**
270 270  
240 +[[image:image-20220527093251-14.png]]
271 271  
272 -[[image:image-20220601143642-2.png]]
273 -
274 274  AT COMMAND
275 275  
276 276  
245 +==== 1.3.3.2 via LoRaWAN DOWNLINK ====
277 277  
278 -==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
279 -
280 -
281 281  [[image:image-20220527093358-15.png]]
282 282  
283 283  (((
... ... @@ -289,7 +289,7 @@
289 289  )))
290 290  
291 291  (((
292 -(% style="color:#4f81bd" %)**Type Code 0xAF**
258 +**Type Code 0xAF**
293 293  )))
294 294  
295 295  (((
... ... @@ -300,7 +300,7 @@
300 300  )))
301 301  
302 302  (((
303 -(% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
269 +Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
304 304  )))
305 305  
306 306  (((
... ... @@ -336,47 +336,40 @@
336 336  )))
337 337  
338 338  (((
339 -
340 -
341 -(% style="color:blue" %)**Example:**
305 +Example:
342 342  )))
343 343  
344 344  (((
345 -**AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
309 +AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
346 346  )))
347 347  
348 -[[image:image-20220601144149-6.png]]
312 +[[image:image-20220527093430-16.png]]
349 349  
350 350  DOWNLINK
351 351  
352 352  
317 +[[image:image-20220527093508-17.png]]
353 353  
354 -[[image:image-20220601143803-3.png]]
355 -
356 356  DOWNLINK
357 357  
358 358  
322 +[[image:image-20220527093530-18.png]]
359 359  
360 -[[image:image-20220601144053-5.png]]
361 -
362 362  DOWNLINK
363 363  
364 364  
327 +[[image:image-20220527093607-19.png]]
365 365  
366 -[[image:image-20220601143921-4.png]]
367 -
368 368  DOWNLINK
369 369  
370 370  
332 +[[image:image-20220527093628-20.png]]
371 371  
372 -[[image:image-20220601142805-5.png]]
373 -
374 374  DOWNLINK
375 375  
376 376  
337 +=== 1.3.4 How to configure and output commands for RS485 to USB ===
377 377  
378 -=== **1.3.4 How to configure and output commands for RS485 to USB** ===
379 -
380 380  (((
381 381  This step is not necessary, it is just to show how to use a normal RS485 to USB adapter to connect to the meter to check the input and output. This can be used to test the connection and RS485 command of the meter without RS485-LN.
382 382  )))
... ... @@ -395,8 +395,6 @@
395 395  
396 396  (((
397 397  check digit: Even
398 -
399 -
400 400  )))
401 401  
402 402  [[image:image-20220527093708-21.png]]
... ... @@ -405,37 +405,27 @@
405 405  
406 406  
407 407  
408 -[[image:image-20220527093747-22.png]]
409 -
410 410  USB
411 411  
412 412  
413 -
414 414  (((
415 415  The configuration command is consistent with the AT command, input the hexadecimal command directly into the serial port, and the serial port will output the command.
416 -
417 -
418 418  )))
419 419  
420 420  (((
421 -(% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
373 +**Example:**  input：01 03 00 31 00 02 95 c4
422 422  )))
423 423  
424 424  (((
425 425   output：01 03 04 00 00 00 42 7A 02
426 -
427 -
428 428  )))
429 429  
430 -[[image:image-20220527093821-23.png]]
380 +[[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
431 431  
432 432  USB
433 433  
384 +=== 1.3.5 How to configure multiple devices and modify device addresses ===
434 434  
435 -
436 -=== **1.3.5 How to configure multiple devices and modify device addresses** ===
437 -
438 -
439 439  If users need to read the parameters of multiple energy meters, they need to modify the device address, because the default device address of each energy meter is 01.
440 440  
441 441  (((
... ... @@ -444,17 +444,14 @@
444 444  )))
445 445  )))
446 446  
447 -[[image:image-20220601142044-1.png]]
394 +[[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
448 448  
396 +**Example**:These two meters are examples of setting parameters and device addresses.
449 449  
450 -(% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
398 +[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="737" width="553"]]
451 451  
452 -[[image:image-20220527093950-25.png]]
400 +[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="733" width="550"]]
453 453  
454 -
455 -[[image:image-20220527094028-26.png]]
456 -
457 -
458 458  (((
459 459  (((
460 460  First of all, since the default device address of the energy meter is 01, the configuration of two energy meters will conflict, so we first connect an energy meter and configure the device address.
... ... @@ -463,7 +463,7 @@
463 463  
464 464  (((
465 465  (((
466 -We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
410 +We can use AT+CFGDEV to set the device address.
467 467  )))
468 468  )))
469 469  
... ... @@ -473,14 +473,10 @@
473 473  )))
474 474  )))
475 475  
476 -[[image:image-20220601142354-2.png]]
420 +[[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
477 477  
422 +AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
478 478  
479 -(% class="box infomessage" %)
480 -(((
481 -**AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
482 -)))
483 -
484 484  * 01:device adaress
485 485  
486 486  * 10:function code
... ... @@ -501,56 +501,43 @@
501 501  
502 502  Its default device address is 01, and the following are the parameters for configuring two energy meters.
503 503  
504 -[[image:image-20220601142452-3.png]]
444 +[[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
505 505  
446 +[[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
506 506  
507 -[[image:image-20220601142607-4.png]]
448 +PAYLOAD:01 08 DF 43 62
508 508  
509 -
510 -(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
511 -
512 512  * 08 DF is the valid value of the meter with device address 02.
513 513  * 43 62 is the valid value of the meter with device address 01.
514 514  
515 -
516 516  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
517 517  
455 +This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to SCHNEIDER SMART and Monitor and control your cabinet remotely with no wires and with Dragino RS485-LN LoRaWAN technology. The structure is like below:
518 518  
519 -This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to SCHNEIDER SMART and Monitor and control your cabinet remotely with no wires and with Dragino RS485-LN LoRaWAN technology.
457 +[[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
520 520  
521 -The structure is like below:
522 -
523 -[[image:image-20220527094330-30.png]]
524 -
525 525  Connection
526 526  
461 +* [[Circuit Breaker Remote Open Close>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Circuit_Breaker_Remote_Open_Close/]] : Configure Documen
527 527  
528 -* Configure Documen:  [[Circuit Breaker Remote Open Close>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Circuit_Breaker_Remote_Open_Close/||_mstmutation="1"]]
529 -
530 -
531 531  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
532 532  
533 -
534 534  This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
535 535  
536 -* Configure Document For RS485-BL:  [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/RS485-BL/Application_Note/&file=Dragino%20RS485BL%20and%20pickdata%20SEM%20Three%20v1.pdf||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
537 -* Configure Document for RS485-LN:  [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/SEM_Three_Energy_Meter/&file=SEM%20three%20and%20Dragino%20RS485-LN%20v1.pdf||_mstmutation="1"]]
467 +* [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/RS485-BL/Application_Note/&file=Dragino%20RS485BL%20and%20pickdata%20SEM%20Three%20v1.pdf]] : Configure Document For RS485-BL
538 538  
469 +* [[Connect to SEM Three>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/SEM_Three_Energy_Meter/&file=SEM%20three%20and%20Dragino%20RS485-LN%20v1.pdf]] : Configure Document for RS485-LN
539 539  
540 -== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
471 +== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
541 541  
542 -
543 543  This instruction is provided by Xavier Florensa Berenguer from [[NORIA GRUPO DE COMPRAS>>url:http://www.gruponovelec.com/]]. It is to show how to use RS485-LN to connect to CEM C31 485-T1-MID and send the data for remote minitor. The structure is like below:
544 544  
545 -* Configure Document For RS485-LN:  [[CEM C31 485-T1-MID>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/ELECTRICAL%20CABINET/&file=ELECTRICAL%20CABINET%20READINGS.pdf||_mstmutation="1" style="background-color: rgb(255, 255, 255);"]]
475 +* [[CEM C31 485-T1-MID>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/ELECTRICAL%20CABINET/&file=ELECTRICAL%20CABINET%20READINGS.pdf]] : Configure Document For RS485-LN
546 546  
477 +== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
547 547  
548 -== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
479 +[[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
549 549  
550 -
551 -[[image:image-20220527094556-31.png]]
552 -
553 553  Network Structure
554 554  
555 -
556 556  * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
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