Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 36.1 >
edited by Xiaoling
on 2022/05/27 09:43
To version < 60.12 >
edited by Xiaoling
on 2022/12/14 14:22
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Summary

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Content
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1 -(% class="wikigeneratedid" %)
2 - **Contents:**
1 +**Table of Contents:**
3 3  
4 4  {{toc/}}
5 5  
5 +
6 +
7 +
8 +
9 +
6 6  = 1. Introduction =
7 7  
12 +
8 8  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
9 9  
15 +
10 10  == 1.1 Example 1: Connect to Leak relay and VFD ==
11 11  
18 +
12 12  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:
13 13  
14 -[[image:image-20220527091852-1.png]]
15 15  
16 -Connection
22 +[[image:image-20220527091852-1.png||height="547" width="994"]]
17 17  
24 +**Connection**
18 18  
19 19  
27 +
20 20  [[image:image-20220527091942-2.png]](% style="display:none" %)
21 21  
22 -Connection
30 +**Connection**
23 23  
24 24  
25 -Related documents:
33 +(% style="color:blue" %)**Related documents:**
26 26  
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.
35 +* 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);"]]
36 +* 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);"]]
29 29  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
30 30  
39 +
40 +
31 31  == 1.2 Example 2: Connect to Pulse Counter ==
32 32  
43 +
33 33  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:
34 34  
35 -[[image:image-20220527092058-3.png]]
36 36  
37 -Connection
47 +[[image:image-20220527092058-3.png||height="552" width="905"]]
38 38  
49 +**Connection**
39 39  
40 -[[image:image-20220527092146-4.png]]
41 41  
42 -Connection
43 43  
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
53 +[[image:image-20220527092146-4.png||height="507" width="906"]]
54 +
55 +**Connection**
56 +
57 +
58 +(% style="color:blue" %)**Related documents:**
59 +
60 +* 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"]]
45 45  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
46 46  
47 -== ==
48 48  
49 -== 1.3 Example3: Use RS485-LN with energy meters ==
50 50  
65 +== 1.3 Example 3: Use RS485-LN with energy meters ==
66 +
51 51  === 1.3.1 OverView ===
52 52  
69 +
53 53  (((
54 -**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
71 +(% style="color:red" %)**Note**：**The specifications of each energy meter are different, please refer to your own energy meter specifications.**
55 55  )))
56 56  
57 57  (((
58 58  This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
76 +
77 +
59 59  )))
60 60  
61 61  [[image:image-20220527092419-5.png]]
62 62  
63 -Connection1
82 +**Connection1**
64 64  
65 65  
85 +
66 66  (((
67 -How to connect with Energy Meter：
87 +(% style="color:blue" %)**How to connect with Energy Meter：**
88 +
89 +
68 68  )))
69 69  
70 70  (((
... ... @@ -85,29 +85,30 @@
85 85  
86 86  (((
87 87  Once there is power, the RS485-LN will be on.
110 +
111 +
88 88  )))
89 89  
90 90  [[image:image-20220527092514-6.png]]
91 91  
92 -Connection2
116 +**Connection2**
93 93  
94 94  
119 +
95 95  [[image:image-20220527092555-7.png]]
96 96  
97 -Connection3
122 +**Connection3**
98 98  
99 99  
100 100  === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
101 101  
127 +
102 102  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.
103 103  
104 -[[image:image-20220527092629-8.png]]
130 +[[image:image-20220601143257-10.png]]
105 105  
106 106  
107 -(% class="box infomessage" %)
108 -(((
109 -**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
110 -)))
133 +(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
111 111  
112 112  * The first byte : slave address code (=001～247)
113 113  * The second byte : read register value function code
... ... @@ -116,12 +116,12 @@
116 116  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
117 117  
118 118  (((
142 +
143 +
144 +
119 119  How to parse the reading of the return command of the parameter：
120 -)))
121 121  
122 -(% class="box infomessage" %)
123 -(((
124 -**Example:** RETURN1：01 03 02 08 FD 7E 05
147 +(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
125 125  )))
126 126  
127 127  * The first byte ARD: slave address code (=001～254)
... ... @@ -134,56 +134,63 @@
134 134  (% class="wikigeneratedid" %)
135 135  (((
136 136  
160 +
161 +
137 137  )))
138 138  
139 139  === 1.3.3 How to configure RS485-LN and parse output commands ===
140 140  
166 +
141 141  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
142 142  
143 143  
144 -==== 1.3.3.1 via AT COMMAND: ====
170 +==== 1.3.3.1 via AT COMMAND ====
145 145  
146 -First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
147 147  
173 +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.
174 +
148 148  (((
149 149  If the configured parameters and commands are incorrect, the return value is not obtained.
177 +
178 +
150 150  )))
151 151  
152 -[[image:image-20220527092748-9.png]]
181 +[[image:image-20220601143201-9.png]]
153 153  
154 -AT COMMAND
183 +**AT COMMAND**
155 155  
156 156  
157 157  (% class="box infomessage" %)
158 158  (((
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
188 + (% _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
160 160  )))
161 161  
162 -a: length for the return of AT+COMMAND
191 +a:  length for the return of AT+COMMAND
163 163  
164 -b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
193 +b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
165 165  
166 -c: define the position for valid value.
195 +c:  define the position for valid value.
167 167  
168 -[[image:image-20220527092936-10.png]]
197 +[[image:image-20220601143115-8.png]]
169 169  
170 -AT COMMAND
199 +**AT COMMAND**
171 171  
172 172  
202 +
173 173  PAYLOAD is available after the valid value is intercepted.
174 174  
205 +[[image:image-20220601143046-7.png]]
175 175  
176 -[[image:image-20220527093059-11.png]]
207 +**AT COMMAND**
177 177  
178 -AT COMMAND
179 179  
180 180  
181 181  You can get configured PAYLOAD on TTN.
182 182  
183 -[[image:image-20220527093133-12.png]]
213 +[[image:image-20220601143519-1.png]]
184 184  
185 185  (((
186 -AT COMMAND
216 +**AT COMMAND**
187 187  )))
188 188  
189 189  (((
... ... @@ -191,63 +191,76 @@
191 191  )))
192 192  
193 193  (((
194 -**Example**: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
224 +(% style="color:blue" %)**Example**:
225 +
226 +
227 +(% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
195 195  )))
196 196  
197 197  (((
198 -RETURN1:01 03 02 00 02 39 85 00 00(return data)
231 +RETURN1: 01 03 02 00 02 39 85 00 00(return data)
199 199  )))
200 200  
201 201  (((
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.
235 +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.
236 +
237 +
203 203  )))
204 204  
205 205  (((
206 -CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
241 +(% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
207 207  )))
208 208  
209 209  (((
210 -RETURN2:01 03 02 08 DC BE 1D(return data)
245 +RETURN2: 01 03 02 08 DC BE 1D(return data)
211 211  )))
212 212  
213 213  (((
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.
249 +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.
250 +
251 +
215 215  )))
216 216  
217 217  (((
218 -CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
255 +(% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
219 219  )))
220 220  
221 221  (((
222 -RETURN3:01 03 04 00 00 00 44 FA 00(return data)
259 +RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
223 223  )))
224 224  
225 225  (((
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.
263 +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.
227 227  )))
228 228  
229 229  (((
230 -Payload:01 00 02 39 85 08 DC 00 00 00 44
267 +Payload: 01 00 02 39 85 08 DC 00 00 00 44
268 +
269 +
231 231  )))
232 232  
233 -[[image:image-20220527093204-13.png]]
272 +[[image:image-20220601142936-6.png]]
234 234  
235 235  AT COMMAND
236 236  
237 237  
238 -(% 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.**
239 239  
240 -[[image:image-20220527093251-14.png]]
278 +(% style="color:blue" %)**01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.**
241 241  
280 +
281 +[[image:image-20220601143642-2.png]]
282 +
242 242  AT COMMAND
243 243  
244 244  
286 +
245 245  ==== 1.3.3.2 via LoRaWAN DOWNLINK ====
246 246  
289 +
247 247  [[image:image-20220527093358-15.png]]
248 248  
249 249  (((
250 -DOWNLINK
293 +**DOWNLINK**
251 251  )))
252 252  
253 253  (((
... ... @@ -255,7 +255,7 @@
255 255  )))
256 256  
257 257  (((
258 -**Type Code 0xAF**
301 +(% style="color:blue" %)**Type Code 0xAF**
259 259  )))
260 260  
261 261  (((
... ... @@ -266,7 +266,9 @@
266 266  )))
267 267  
268 268  (((
269 -Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
312 +(% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
313 +
314 +
270 270  )))
271 271  
272 272  (((
... ... @@ -302,40 +302,47 @@
302 302  )))
303 303  
304 304  (((
305 -Example:
350 +
351 +
352 +(% style="color:blue" %)**Example:**
306 306  )))
307 307  
308 308  (((
309 -AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
356 +**AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
310 310  )))
311 311  
312 -[[image:image-20220527093430-16.png]]
359 +[[image:image-20220601144149-6.png]]
313 313  
314 -DOWNLINK
361 +**DOWNLINK**
315 315  
316 316  
317 -[[image:image-20220527093508-17.png]]
318 318  
319 -DOWNLINK
365 +[[image:image-20220601143803-3.png]]
320 320  
367 +**DOWNLINK**
321 321  
322 -[[image:image-20220527093530-18.png]]
323 323  
324 -DOWNLINK
325 325  
371 +[[image:image-20220601144053-5.png]]
326 326  
327 -[[image:image-20220527093607-19.png]]
373 +**DOWNLINK**
328 328  
329 -DOWNLINK
330 330  
331 331  
332 -[[image:image-20220527093628-20.png]]
377 +[[image:image-20220601143921-4.png]]
333 333  
334 -DOWNLINK
335 -
379 +**DOWNLINK**
336 336  
381 +
382 +
383 +[[image:image-20220601142805-5.png]]
384 +
385 +**DOWNLINK**
386 +
387 +
337 337  === 1.3.4 How to configure and output commands for RS485 to USB ===
338 338  
390 +
339 339  (((
340 340  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.
341 341  )))
... ... @@ -354,37 +354,47 @@
354 354  
355 355  (((
356 356  check digit: Even
409 +
410 +
357 357  )))
358 358  
359 359  [[image:image-20220527093708-21.png]]
360 360  
361 -USB
415 +**USB**
362 362  
363 363  
418 +
364 364  [[image:image-20220527093747-22.png]]
365 365  
366 -USB
421 +**USB**
367 367  
368 368  
424 +
369 369  (((
370 370  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.
427 +
428 +
371 371  )))
372 372  
373 373  (((
374 -**Example:**  input：01 03 00 31 00 02 95 c4
432 +(% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
375 375  )))
376 376  
377 377  (((
378 378   output：01 03 04 00 00 00 42 7A 02
437 +
438 +
379 379  )))
380 380  
381 381  [[image:image-20220527093821-23.png]]
382 382  
383 -USB
443 +**USB**
384 384  
385 385  
446 +
386 386  === 1.3.5 How to configure multiple devices and modify device addresses ===
387 387  
449 +
388 388  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.
389 389  
390 390  (((
... ... @@ -393,15 +393,18 @@
393 393  )))
394 394  )))
395 395  
396 -[[image:image-20220527093849-24.png]]
458 +[[image:image-20220601142044-1.png]]
397 397  
398 398  
399 -**Example**:These two meters are examples of setting parameters and device addresses.
461 +(% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
400 400  
463 +
401 401  [[image:image-20220527093950-25.png]]
402 402  
466 +
403 403  [[image:image-20220527094028-26.png]]
404 404  
469 +
405 405  (((
406 406  (((
407 407  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.
... ... @@ -410,7 +410,7 @@
410 410  
411 411  (((
412 412  (((
413 -We can use AT+CFGDEV to set the device address.
478 +We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
414 414  )))
415 415  )))
416 416  
... ... @@ -420,16 +420,17 @@
420 420  )))
421 421  )))
422 422  
423 -[[image:image-20220527094100-27.png]]
488 +[[image:image-20220601142354-2.png]]
424 424  
490 +
425 425  (% class="box infomessage" %)
426 426  (((
427 427  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
428 428  )))
429 429  
430 -* 01:device adaress
496 +* 01: device adaress
431 431  
432 -* 10:function code
498 +* 10: function code
433 433  
434 434  * 00 61：Register address
435 435  
... ... @@ -447,45 +447,62 @@
447 447  
448 448  Its default device address is 01, and the following are the parameters for configuring two energy meters.
449 449  
450 -[[image:image-20220527094150-28.png]]
516 +[[image:image-20220601142452-3.png]]
451 451  
452 452  
453 -[[image:image-20220527094224-29.png]]
519 +[[image:image-20220601142607-4.png]]
454 454  
455 -PAYLOAD:01 08 DF 43 62
456 456  
522 +(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
523 +
457 457  * 08 DF is the valid value of the meter with device address 02.
458 458  * 43 62 is the valid value of the meter with device address 01.
459 459  
527 +(% style="display:none" %) (%%)
460 460  
529 +(% style="display:none" %) (%%)
530 +
461 461  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
462 462  
463 -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:
464 464  
465 -[[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
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-LN to connect to SCHNEIDER SMART and Monitor and control your cabinet remotely with no wires and with Dragino RS485-LN LoRaWAN technology.
466 466  
536 +The structure is like below:
537 +
538 +[[image:image-20220527094330-30.png]]
539 +
467 467  Connection
468 468  
469 -* [[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
470 470  
543 +* 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"]]
544 +
545 +
546 +
471 471  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
472 472  
549 +
473 473  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:
474 474  
475 -* [[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
552 +* 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);"]]
553 +* 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"]]
476 476  
477 -* [[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
478 478  
479 -== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
480 480  
557 +== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
558 +
559 +
481 481  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:
482 482  
483 -* [[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
562 +* 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);"]]
484 484  
485 -== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
486 486  
487 -[[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
488 488  
566 +== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
567 +
568 +
569 +[[image:image-20220527094556-31.png]]
570 +
489 489  Network Structure
490 490  
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491 491  * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
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