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From version < 41.9 >
edited by Xiaoling
on 2022/05/31 09:39
To version < 1.4 >
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Summary

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Content
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1 -(% class="wikigeneratedid" %)
2 - **Contents:**
1 += 1. Introduction =
3 3  
4 -{{toc/}}
5 -
6 -
7 -
8 -
9 -
10 -
11 -= **1. Introduction** =
12 -
13 13  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
14 14  
5 +== 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 18  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:
19 19  
20 -[[image:image-20220527091852-1.png]]
9 +[[image:https://wiki.dragino.com/images/thumb/5/5c/RS485_01.png/600px-RS485_01.png||height="297" width="534"]]
21 21  
22 22  Connection
23 23  
13 +[[image:https://wiki.dragino.com/images/thumb/f/f2/RS485_02.png/600px-RS485_02.png||height="743" width="528"]](% style="display:none" %)
24 24  
25 -
26 -[[image:image-20220527091942-2.png]](% style="display:none" %)
27 -
28 28  Connection
29 29  
30 -
31 31  Related documents:
32 32  
33 33  * [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
... ... @@ -35,86 +35,64 @@
35 35  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
36 36  
37 37  
38 -== **1.2 Example 2: Connect to Pulse Counter** ==
24 +== 1.2 Example 2: Connect to Pulse Counter ==
39 39  
40 40  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:
41 41  
42 -[[image:image-20220527092058-3.png]]
28 +[[image:https://wiki.dragino.com/images/thumb/3/34/RS485_02_1.png/600px-RS485_02_1.png||height="364" width="600"]]
43 43  
44 44  Connection
45 45  
32 +[[image:https://wiki.dragino.com/images/thumb/5/5f/RS485_02_2.png/600px-RS485_02_2.png||height="337" width="600"]]
46 46  
47 -[[image:image-20220527092146-4.png]]
48 -
49 49  Connection
50 50  
51 51  * [[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
52 52  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
53 53  
54 -== ==
55 55  
56 -== **1.3 Example3: Use RS485-LN with energy meters** ==
40 +== 1.3 Example3: Use RS485-LN with energy meters ==
57 57  
58 -=== **1.3.1 OverView** ===
42 +=== 1.3.1 OverView ===
59 59  
60 -(((
61 -**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
62 -)))
44 +Note：The specifications of each energy meter are different, please refer to your own energy meter specifications.
63 63  
64 -(((
65 65  This example describes a single-phase meter.This is the connection between the RS485-LN and the energy meter.
66 -)))
67 67  
68 -[[image:image-20220527092419-5.png]]
48 +[[image:https://wiki.dragino.com/images/thumb/f/f4/Meter1.jpg/600px-Meter1.jpg||height="800" width="600"]]
69 69  
70 70  Connection1
71 71  
72 -
73 -(((
74 74  How to connect with Energy Meter：
75 -)))
76 76  
77 -(((
78 78  Follow the instructions of the electric energy meter to connect the phase line and the neutral line, and then connect 485A+ and 485B- to RS485A and RA485B of RS485-LN respectively.
79 -)))
80 80  
81 -(((
82 82  The RS485-LN can be powered by 7 ~~ 24V DC power source. Connection as below
83 -)))
84 84  
85 -(((
86 86  Power Source VIN to RS485-LN VIN+
87 -)))
88 88  
89 -(((
90 90  Power Source GND to RS485-LN VIN-
91 -)))
92 92  
93 -(((
94 94  Once there is power, the RS485-LN will be on.
95 -)))
96 96  
97 -[[image:image-20220527092514-6.png]]
64 +[[image:https://wiki.dragino.com/images/thumb/1/15/Meter2.jpg/600px-Meter2.jpg||height="450" width="600"]]
98 98  
99 99  Connection2
100 100  
68 +[[image:https://wiki.dragino.com/images/thumb/a/a5/Meter3.jpg/600px-Meter3.jpg||height="800" width="600"]]
101 101  
102 -[[image:image-20220527092555-7.png]]
103 -
104 104  Connection3
105 105  
106 106  
107 -=== **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
73 +=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
108 108  
109 -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.
75 +If the user needs to read the parameters of the electric energy meter and use the modbus command,
110 110  
111 -[[image:image-20220527092629-8.png]]
77 +please refer to the appendix of the MODBUS communication protocol in the user manual of the energy meter.
112 112  
79 +[[image:https://wiki.dragino.com/images/thumb/3/35/Meter4.png/600px-Meter4.png||alt="Meter4.png" height="193" width="600"]]
113 113  
114 -(% class="box infomessage" %)
115 -(((
116 -**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
117 -)))
81 +Example:AT+COMMAND1=01 03 00 00 00 01 84 0A
118 118  
119 119  * The first byte : slave address code (=001～247)
120 120  * The second byte : read register value function code
... ... @@ -122,14 +122,9 @@
122 122  * 5th and 6th bytes: Number of registers to read
123 123  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
124 124  
125 -(((
126 126  How to parse the reading of the return command of the parameter：
127 -)))
128 128  
129 -(% class="box infomessage" %)
130 -(((
131 -**Example:** RETURN1：01 03 02 08 FD 7E 05
132 -)))
91 +Example:RETURN1：01 03 02 08 FD 7E 05
133 133  
134 134  * The first byte ARD: slave address code (=001～254)
135 135  * The second byte: Return to read function code
... ... @@ -138,34 +138,23 @@
138 138  * The 6th and 7th bytes: CRC16 checksum
139 139  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
140 140  
141 -(% class="wikigeneratedid" %)
142 -(((
143 -
144 -)))
145 145  
146 -=== **1.3.3 How to configure RS485-LN and parse output commands** ===
101 +=== 1.3.3 How to configure RS485-LN and parse output commands ===
147 147  
148 148  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
149 149  
105 +==== via AT COMMAND: ====
150 150  
151 -==== **1.3.3.1 via AT COMMAND:** ====
107 +First, we can use AT+CFGDEV to get the return value, and we can also judge whether the input parameters are correct.
152 152  
153 -First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
154 -
155 -(((
156 156  If the configured parameters and commands are incorrect, the return value is not obtained.
157 -)))
158 158  
159 -[[image:image-20220527092748-9.png]]
111 +[[image:https://wiki.dragino.com/images/b/bc/AT_COMMAND1.png||height="358" width="456"]]
160 160  
161 161  AT COMMAND
162 162  
115 +AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
163 163  
164 -(% class="box infomessage" %)
165 -(((
166 - AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
167 -)))
168 -
169 169  a: length for the return of AT+COMMAND
170 170  
171 171  b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
... ... @@ -172,273 +172,159 @@
172 172  
173 173  c: define the position for valid value.
174 174  
175 -[[image:image-20220527092936-10.png]]
123 +[[image:https://wiki.dragino.com/images/7/7d/AT_COMMAND2.png||height="278" width="477"]]
176 176  
177 177  AT COMMAND
178 178  
179 -
180 180  PAYLOAD is available after the valid value is intercepted.
181 181  
129 +[[image:https://wiki.dragino.com/images/3/3a/AT_COMMAND4.png||height="219" width="576"]]
182 182  
183 -[[image:image-20220527093059-11.png]]
184 -
185 185  AT COMMAND
186 186  
187 -
188 188  You can get configured PAYLOAD on TTN.
189 189  
190 -[[image:image-20220527093133-12.png]]
135 +[[image:https://wiki.dragino.com/images/thumb/c/c2/AT_COMMAND3.png/600px-AT_COMMAND3.png||height="138" width="600"]]
191 191  
192 -(((
193 193  AT COMMAND
194 -)))
195 195  
196 -(((
197 -
198 -)))
139 +Example: CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
199 199  
200 -(((
201 -(% style="color:#4f81bd" %)**Example**:
202 -
203 -CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
204 -)))
205 -
206 -(((
207 207  RETURN1:01 03 02 00 02 39 85 00 00(return data)
208 -)))
209 209  
210 -(((
211 211  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.
212 212  
213 -
214 -)))
215 -
216 -(((
217 217  CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
218 -)))
219 219  
220 -(((
221 221  RETURN2:01 03 02 08 DC BE 1D(return data)
222 -)))
223 223  
224 -(((
225 225  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.
226 226  
227 -
228 -)))
229 -
230 -(((
231 231  CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
232 -)))
233 233  
234 -(((
235 235  RETURN3:01 03 04 00 00 00 44 FA 00(return data)
236 -)))
237 237  
238 -(((
239 239  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.
240 -)))
241 241  
242 -(((
243 243  Payload:01 00 02 39 85 08 DC 00 00 00 44
244 -)))
245 245  
246 -[[image:image-20220527093204-13.png]]
159 +[[image:https://wiki.dragino.com/images/thumb/9/9b/AT_COMMAND10.png/600px-AT_COMMAND10.png||height="278" width="600"]]
247 247  
248 248  AT COMMAND
249 249  
163 +01 is device address,00 02 is the current, 08 DC is the voltage,00 00 00 44 is the total active energy.
250 250  
251 -(% 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.**
165 +[[~[~[image:https://wiki.dragino.com/images/thumb/b/b8/AT_COMMAND11.png/600px-AT_COMMAND11.png~|~|height="271" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:AT_COMMAND11.png]]
252 252  
253 -[[image:image-20220527093251-14.png]]
254 -
255 255  AT COMMAND
256 256  
169 +==== 1.3.3.1 via LoRaWAN DOWNLINK ====
257 257  
258 -==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
171 +[[image:https://wiki.dragino.com/images/thumb/f/fc/DOWNLINK_METER1.png/600px-DOWNLINK_METER1.png||height="423" width="600"]]
259 259  
260 -[[image:image-20220527093358-15.png]]
261 -
262 -(((
263 263  DOWNLINK
264 -)))
265 265  
266 -(((
267 -
268 -)))
175 +Type Code 0xAF
269 269  
270 -(((
271 -(% style="color:#4f81bd" %)**Type Code 0xAF**
272 -)))
273 -
274 -(((
275 -(% class="box infomessage" %)
276 -(((
277 277  0xAF downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
278 -)))
279 -)))
280 280  
281 -(((
282 282  Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
283 -)))
284 284  
285 -(((
286 286  Format: AF MM NN LL XX XX XX XX YY
287 -)))
288 288  
289 -(((
290 290  Where:
291 -)))
292 292  
293 -(((
294 294  MM: the ATCOMMAND or AT+DATACUT to be set. Value from 01 ~~ 0F,
295 -)))
296 296  
297 -(((
298 298  NN: 0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
299 -)))
300 300  
301 -(((
302 302  LL: The length of AT+COMMAND or AT+DATACUT command
303 -)))
304 304  
305 -(((
306 306  XX XX XX XX: AT+COMMAND or AT+DATACUT command
307 -)))
308 308  
309 -(((
310 310  YY: If YY=0, RS485-LN will execute the downlink command without uplink; if YY=1, RS485-LN
311 -)))
312 312  
313 -(((
314 314  will execute an uplink after got this command.
315 -)))
316 316  
317 -(((
318 -(% style="color:#4f81bd" %)**Example:**
319 -)))
197 +Example:
320 320  
321 -(((
322 -**AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
323 -)))
199 +AF 03 01 06 0A 05 00 04 00 01 00: Same as AT+COMMAND3=0A 05 00 04 00 01,1
324 324  
325 -[[image:image-20220527093430-16.png]]
201 +[[image:https://wiki.dragino.com/images/thumb/4/45/DOWNLINK_METER2.png/600px-DOWNLINK_METER2.png||height="208" width="600"]]
326 326  
327 327  DOWNLINK
328 328  
205 +[[~[~[image:https://wiki.dragino.com/images/thumb/2/20/DOWNLINK_METER3.png/600px-DOWNLINK_METER3.png~|~|height="105" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:DOWNLINK_METER3.png]]
329 329  
330 -[[image:image-20220527093508-17.png]]
331 -
332 332  DOWNLINK
333 333  
209 +[[image:https://wiki.dragino.com/images/thumb/2/27/DOWNLINK_METER4.png/600px-DOWNLINK_METER4.png||height="210" width="600"]]
334 334  
335 -[[image:image-20220527093530-18.png]]
336 -
337 337  DOWNLINK
338 338  
213 +[[~[~[image:https://wiki.dragino.com/images/thumb/3/39/DOWNLINK_METER5.png/600px-DOWNLINK_METER5.png~|~|height="176" width="600"~]~]>>url:https://wiki.dragino.com/index.php/File:DOWNLINK_METER5.png]]
339 339  
340 -[[image:image-20220527093607-19.png]]
341 -
342 342  DOWNLINK
343 343  
217 +[[image:https://wiki.dragino.com/images/thumb/a/a2/DOWNLINK_METER6.png/600px-DOWNLINK_METER6.png||height="365" width="600"]]
344 344  
345 -[[image:image-20220527093628-20.png]]
346 -
347 347  DOWNLINK
348 348  
349 349  
350 -=== **1.3.4 How to configure and output commands for RS485 to USB** ===
222 +=== 1.3.4 How to configure and output commands for RS485 to USB ===
351 351  
352 -(((
353 353  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.
354 -)))
355 355  
356 -(((
357 357  First, connect the A+ and A- of the USB to the 485 A and 485 B of the energy meter.
358 -)))
359 359  
360 -(((
361 361  Open the serial port debugging, set the send and receive to HEX.
362 -)))
363 363  
364 -(((
365 365  Baud rate: 9600
366 -)))
367 367  
368 -(((
369 369  check digit: Even
370 -)))
371 371  
372 -[[image:image-20220527093708-21.png]]
234 +[[image:https://wiki.dragino.com/images/thumb/8/8f/Usb_meter2.jpg/600px-Usb_meter2.jpg||height="800" width="600"]]
373 373  
374 374  USB
375 375  
238 +[[image:https://wiki.dragino.com/images/thumb/6/62/Usb_meter1.jpg/600px-Usb_meter1.jpg||height="800" width="600"]]
376 376  
377 -[[image:image-20220527093747-22.png]]
378 -
379 379  USB
380 380  
381 -
382 -(((
383 383  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.
384 -)))
385 385  
386 -(((
387 -(% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
388 -)))
244 +Example:input：01 03 00 31 00 02 95 c4
389 389  
390 -(((
391 - output：01 03 04 00 00 00 42 7A 02
392 -)))
246 +{{{ output:01 03 04 00 00 00 42 7A 02
247 +}}}
393 393  
394 -[[image:image-20220527093821-23.png]]
249 +[[image:https://wiki.dragino.com/images/thumb/b/b3/Usb_meter3.jpg/600px-Usb_meter3.jpg||height="466" width="600"]]
395 395  
396 396  USB
397 397  
253 +=== 1.3.5 How to configure multiple devices and modify device addresses ===
398 398  
399 -=== **1.3.5 How to configure multiple devices and modify device addresses** ===
400 -
401 401  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.
402 402  
403 -(((
404 -(((
405 405  Set the device address according to the parameters in the appendix of the MODBUS communication protocol.
406 -)))
407 -)))
408 408  
409 -[[image:image-20220527093849-24.png]]
259 +[[image:https://wiki.dragino.com/images/thumb/1/1f/Double_meter3.png/600px-Double_meter3.png||alt="Double meter3.png" height="83" width="600"]]
410 410  
261 +Example:These two meters are examples of setting parameters and device addresses.
411 411  
412 -**Example**:These two meters are examples of setting parameters and device addresses.
263 +[[image:https://wiki.dragino.com/images/thumb/e/ee/Double_meter1.jpg/600px-Double_meter1.jpg||alt="Double meter1.jpg" height="800" width="600"]]
413 413  
414 -[[image:image-20220527093950-25.png]]
265 +[[image:https://wiki.dragino.com/images/thumb/7/72/Double_meter2.jpg/600px-Double_meter2.jpg||alt="Double meter2.jpg" height="800" width="600"]]
415 415  
416 -[[image:image-20220527094028-26.png]]
417 -
418 -(((
419 -(((
420 420  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.
421 -)))
422 -)))
423 423  
424 -(((
425 -(((
426 426  We can use AT+CFGDEV to set the device address.
427 -)))
428 -)))
429 429  
430 -(((
431 -(((
432 432  We modify the device address 01 of the first energy meter to 02.
433 -)))
434 -)))
435 435  
436 -[[image:image-20220527094100-27.png]]
273 +[[image:https://wiki.dragino.com/images/6/6b/Double_meter4.png||alt="Double meter4.png" height="141" width="456"]]
437 437  
438 -(% class="box infomessage" %)
439 -(((
440 -**AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
441 -)))
275 +AT+CFGDEV:01 10 00 61 00 01 02 00 02,1
442 442  
443 443  * 01:device adaress
444 444  
... ... @@ -460,23 +460,21 @@
460 460  
461 461  Its default device address is 01, and the following are the parameters for configuring two energy meters.
462 462  
463 -[[image:image-20220527094150-28.png]]
297 +[[image:https://wiki.dragino.com/images/1/13/Meter11.png||alt="Meter11.png" height="576" width="379"]]
464 464  
299 +[[image:https://wiki.dragino.com/images/thumb/7/7e/Meter12.png/600px-Meter12.png||alt="Meter12.png" height="262" width="600"]]
465 465  
466 -[[image:image-20220527094224-29.png]]
301 +PAYLOAD:01 08 DF 43 62
467 467  
468 -**PAYLOAD:01 08 DF 43 62**
469 -
470 470  * 08 DF is the valid value of the meter with device address 02.
471 471  * 43 62 is the valid value of the meter with device address 01.
472 472  
473 473  
474 -
475 475  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
476 476  
477 477  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:
478 478  
479 -[[image:image-20220527094330-30.png]]
311 +[[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
480 480  
481 481  Connection
482 482  
... ... @@ -483,7 +483,6 @@
483 483  * [[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
484 484  
485 485  
486 -
487 487  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
488 488  
489 489  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:
... ... @@ -492,6 +492,7 @@
492 492  
493 493  * [[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
494 494  
326 +
495 495  == 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
496 496  
497 497  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:
... ... @@ -498,9 +498,10 @@
498 498  
499 499  * [[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
500 500  
333 +
501 501  == 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
502 502  
503 -[[image:image-20220527094556-31.png]]
336 +[[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
504 504  
505 505  Network Structure
506 506  
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