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From version < 62.2 >
edited by Xiaoling
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Summary

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Content
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1 -**Table of Contents:**
1 +(% class="wikigeneratedid" %)
2 + **Contents:**
2 2  
3 3  {{toc/}}
4 4  
5 -
6 -
7 -
8 -
9 -
10 10  = 1. Introduction =
11 11  
12 -
13 13  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
14 14  
15 -
16 16  == 1.1 Example 1: Connect to Leak relay and VFD ==
17 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  
14 +[[image:image-20220527091852-1.png]]
21 21  
22 -[[image:image-20220527091852-1.png||height="547" width="994"]]
16 +Connection
23 23  
24 -**Connection**
25 25  
26 26  
27 27  [[image:image-20220527091942-2.png]](% style="display:none" %)
28 28  
29 -**Connection**
22 +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 -
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);"]]
37 -
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.
38 38  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
39 39  
40 -
41 -
42 42  == 1.2 Example 2: Connect to Pulse Counter ==
43 43  
44 -
45 45  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:
46 46  
35 +[[image:image-20220527092058-3.png]]
47 47  
48 -[[image:image-20220527092058-3.png||height="552" width="905"]]
37 +Connection
49 49  
50 -**Connection**
51 51  
40 +[[image:image-20220527092146-4.png]]
52 52  
53 -[[image:image-20220527092146-4.png||height="507" width="906"]]
42 +Connection
54 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"]]
61 -
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
62 62  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
63 63  
47 +== ==
64 64  
49 +== 1.3 Example3: Use RS485-LN with energy meters ==
65 65  
66 -== 1.3 Example 3: Use RS485-LN with energy meters ==
67 -
68 68  === 1.3.1 OverView ===
69 69  
70 -
71 71  (((
72 -(% 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.
73 73  )))
74 74  
75 75  (((
... ... @@ -78,13 +78,11 @@
78 78  
79 79  [[image:image-20220527092419-5.png]]
80 80  
81 -**Connection1**
63 +Connection1
82 82  
83 83  
84 84  (((
85 -(% style="color:blue" %)**How to connect with Energy Meter：**
86 -
87 -
67 +How to connect with Energy Meter：
88 88  )))
89 89  
90 90  (((
... ... @@ -96,11 +96,11 @@
96 96  )))
97 97  
98 98  (((
99 -Power Source **VIN** to RS485-LN **VIN+**
79 +Power Source VIN to RS485-LN VIN+
100 100  )))
101 101  
102 102  (((
103 -Power Source **GND** to RS485-LN **VIN-**
83 +Power Source GND to RS485-LN VIN-
104 104  )))
105 105  
106 106  (((
... ... @@ -109,108 +109,101 @@
109 109  
110 110  [[image:image-20220527092514-6.png]]
111 111  
112 -**Connection2**
92 +Connection2
113 113  
114 114  
115 115  [[image:image-20220527092555-7.png]]
116 116  
117 -**Connection3**
97 +Connection3
118 118  
119 119  
120 120  === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
121 121  
122 -
123 123  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.
124 124  
125 -[[image:image-20220601143257-10.png]]
104 +[[image:image-20220527092629-8.png]]
126 126  
127 127  
128 -(% 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 +)))
129 129  
130 130  * The first byte : slave address code (=001～247)
131 -
132 132  * The second byte : read register value function code
133 -
134 134  * 3rd and 4th bytes: start address of register to be read
135 -
136 136  * 5th and 6th bytes: Number of registers to read
137 -
138 138  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
139 139  
140 140  (((
141 -
142 -
143 -
144 144  How to parse the reading of the return command of the parameter：
120 +)))
145 145  
146 -(% 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
147 147  )))
148 148  
149 149  * The first byte ARD: slave address code (=001～254)
150 -
151 151  * The second byte: Return to read function code
152 -
153 153  * 3rd byte: total number of bytes
154 -
155 155  * 4th～5th bytes: register data
156 -
157 157  * The 6th and 7th bytes: CRC16 checksum
158 -
159 159  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
160 160  
134 +(% class="wikigeneratedid" %)
135 +(((
136 +
137 +)))
161 161  
162 -
163 163  === 1.3.3 How to configure RS485-LN and parse output commands ===
164 164  
165 -
166 166  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
167 167  
168 168  
169 -==== **1.3.3.1 via AT COMMAND** ====
144 +==== 1.3.3.1 via AT COMMAND: ====
170 170  
146 +First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
171 171  
172 -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.
173 -
174 174  (((
175 175  If the configured parameters and commands are incorrect, the return value is not obtained.
176 -
177 -
178 178  )))
179 179  
180 -[[image:image-20220601143201-9.png]]
152 +[[image:image-20220527092748-9.png]]
181 181  
182 -**AT COMMAND**
154 +AT COMMAND
183 183  
184 184  
185 185  (% class="box infomessage" %)
186 186  (((
187 - (% _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
188 188  )))
189 189  
190 -a:  length for the return of AT+COMMAND
162 +a: length for the return of AT+COMMAND
191 191  
192 -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.
193 193  
194 -c:  define the position for valid value.
166 +c: define the position for valid value.
195 195  
196 -[[image:image-20220601143115-8.png]]
168 +[[image:image-20220527092936-10.png]]
197 197  
198 -**AT COMMAND**
170 +AT COMMAND
199 199  
200 200  
201 201  PAYLOAD is available after the valid value is intercepted.
202 202  
203 -[[image:image-20220601143046-7.png]]
204 204  
205 -**AT COMMAND**
176 +[[image:image-20220527093059-11.png]]
206 206  
178 +AT COMMAND
207 207  
180 +
208 208  You can get configured PAYLOAD on TTN.
209 209  
210 -[[image:image-20220601143519-1.png]]
183 +[[image:image-20220527093133-12.png]]
211 211  
212 212  (((
213 -**AT COMMAND**
186 +AT COMMAND
214 214  )))
215 215  
216 216  (((
... ... @@ -218,76 +218,71 @@
218 218  )))
219 219  
220 220  (((
221 -(% style="color:blue" %)**Example**:
222 -
223 -(% 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
224 224  )))
225 225  
226 226  (((
227 -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)
228 228  )))
229 229  
230 230  (((
231 -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 -
233 -
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.
234 234  )))
235 235  
236 236  (((
237 -(% 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
238 238  )))
239 239  
240 240  (((
241 -RETURN2: 01 03 02 08 DC BE 1D(return data)
210 +RETURN2:01 03 02 08 DC BE 1D(return data)
242 242  )))
243 243  
244 244  (((
245 -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 -
247 -
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.
248 248  )))
249 249  
250 250  (((
251 -(% 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
252 252  )))
253 253  
254 254  (((
255 -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)
256 256  )))
257 257  
258 258  (((
259 -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.
260 260  )))
261 261  
262 262  (((
263 -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
264 264  )))
265 265  
266 -[[image:image-20220601142936-6.png]]
233 +[[image:image-20220527093204-13.png]]
267 267  
268 268  AT COMMAND
269 269  
270 270  
271 -(% 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.**
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.**
272 272  
240 +[[image:image-20220527093251-14.png]]
273 273  
274 -[[image:image-20220601143642-2.png]]
275 -
276 276  AT COMMAND
277 277  
278 278  
279 -==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
245 +==== 1.3.3.2 via LoRaWAN DOWNLINK ====
280 280  
281 -
282 282  [[image:image-20220527093358-15.png]]
283 283  
284 284  (((
285 -**DOWNLINK**
250 +DOWNLINK
286 286  )))
287 287  
253 +(((
254 +
255 +)))
288 288  
289 289  (((
290 -(% style="color:blue" %)**Type Code 0xAF**
258 +**Type Code 0xAF**
291 291  )))
292 292  
293 293  (((
... ... @@ -298,7 +298,7 @@
298 298  )))
299 299  
300 300  (((
301 -(% 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.
302 302  )))
303 303  
304 304  (((
... ... @@ -333,43 +333,41 @@
333 333  will execute an uplink after got this command.
334 334  )))
335 335  
336 -
337 337  (((
338 -(% style="color:blue" %)**Example:**
305 +Example:
339 339  )))
340 340  
341 341  (((
342 -**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
343 343  )))
344 344  
345 -[[image:image-20220601144149-6.png]]
312 +[[image:image-20220527093430-16.png]]
346 346  
347 -**DOWNLINK**
314 +DOWNLINK
348 348  
349 349  
350 -[[image:image-20220601143803-3.png]]
317 +[[image:image-20220527093508-17.png]]
351 351  
352 -**DOWNLINK**
319 +DOWNLINK
353 353  
354 354  
355 -[[image:image-20220601144053-5.png]]
322 +[[image:image-20220527093530-18.png]]
356 356  
357 -**DOWNLINK**
324 +DOWNLINK
358 358  
359 359  
360 -[[image:image-20220601143921-4.png]]
327 +[[image:image-20220527093607-19.png]]
361 361  
362 -**DOWNLINK**
329 +DOWNLINK
363 363  
364 364  
365 -[[image:image-20220601142805-5.png]]
332 +[[image:image-20220527093628-20.png]]
366 366  
367 -**DOWNLINK**
334 +DOWNLINK
335 +
368 368  
369 -
370 370  === 1.3.4 How to configure and output commands for RS485 to USB ===
371 371  
372 -
373 373  (((
374 374  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.
375 375  )))
... ... @@ -392,37 +392,33 @@
392 392  
393 393  [[image:image-20220527093708-21.png]]
394 394  
395 -**USB**
361 +USB
396 396  
397 397  
398 398  [[image:image-20220527093747-22.png]]
399 399  
400 -**USB**
366 +USB
401 401  
402 402  
403 -
404 404  (((
405 405  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.
406 406  )))
407 407  
408 408  (((
409 -(% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
374 +**Example:**  input：01 03 00 31 00 02 95 c4
410 410  )))
411 411  
412 412  (((
413 413   output：01 03 04 00 00 00 42 7A 02
414 -
415 -
416 416  )))
417 417  
418 418  [[image:image-20220527093821-23.png]]
419 419  
420 -**USB**
383 +USB
421 421  
422 422  
423 423  === 1.3.5 How to configure multiple devices and modify device addresses ===
424 424  
425 -
426 426  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.
427 427  
428 428  (((
... ... @@ -431,18 +431,15 @@
431 431  )))
432 432  )))
433 433  
434 -[[image:image-20220601142044-1.png]]
396 +[[image:image-20220527093849-24.png]]
435 435  
436 436  
437 -(% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
399 +**Example**:These two meters are examples of setting parameters and device addresses.
438 438  
439 -
440 440  [[image:image-20220527093950-25.png]]
441 441  
442 -
443 443  [[image:image-20220527094028-26.png]]
444 444  
445 -
446 446  (((
447 447  (((
448 448  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.
... ... @@ -451,7 +451,7 @@
451 451  
452 452  (((
453 453  (((
454 -We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
413 +We can use AT+CFGDEV to set the device address.
455 455  )))
456 456  )))
457 457  
... ... @@ -461,17 +461,16 @@
461 461  )))
462 462  )))
463 463  
464 -[[image:image-20220601142354-2.png]]
423 +[[image:image-20220527094100-27.png]]
465 465  
466 -
467 467  (% class="box infomessage" %)
468 468  (((
469 469  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
470 470  )))
471 471  
472 -* 01: device adaress
430 +* 01:device adaress
473 473  
474 -* 10: function code
432 +* 10:function code
475 475  
476 476  * 00 61：Register address
477 477  
... ... @@ -489,77 +489,45 @@
489 489  
490 490  Its default device address is 01, and the following are the parameters for configuring two energy meters.
491 491  
492 -[[image:image-20220601142452-3.png]]
450 +[[image:image-20220527094150-28.png]]
493 493  
494 494  
495 -[[image:image-20220601142607-4.png]]
453 +[[image:image-20220527094224-29.png]]
496 496  
455 +PAYLOAD:01 08 DF 43 62
497 497  
498 -(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
499 -
500 500  * 08 DF is the valid value of the meter with device address 02.
501 501  * 43 62 is the valid value of the meter with device address 01.
502 502  
503 -(% style="display:none" %) (%%)
504 504  
505 -
506 506  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
507 507  
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:
508 508  
509 -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.
465 +[[image:https://wiki.dragino.com/images/thumb/f/fa/RS485_04_2.png/600px-RS485_04_2.png||height="336" width="600"]]
510 510  
511 -The structure is like below:
467 +Connection
512 512  
513 -[[image:image-20220527094330-30.png]]
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
514 514  
515 -**Connection**
516 -
517 -
518 -* 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"]]
519 -
520 -
521 -
522 522  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
523 523  
524 -
525 525  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:
526 526  
527 -* 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);"]]
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
528 528  
529 -* 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"]]
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
530 530  
479 +== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
531 531  
532 -
533 -== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
534 -
535 -
536 536  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:
537 537  
538 -* 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);"]]
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
539 539  
485 +== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
540 540  
487 +[[image:https://wiki.dragino.com/images/thumb/9/97/PLC_M221.png/600px-PLC_M221.png||height="353" width="600"]]
541 541  
542 -== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
543 -
544 -
545 -[[image:image-20220527094556-31.png]]
546 -
547 -
548 548  Network Structure
549 549  
550 550  * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
551 -
552 -
553 -
554 -== 1.8 Example 8: This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. ==
555 -
556 -
557 -This sketch uses 4 registers: some of them can be set by Dragino with a command, another is used to store value from a DS18B20 temperature sensor, or a random generated number. All data is 16bit uint, but the sketch shows also how to represent booleans and negative numbers.
558 -
559 -In the next days I will be adding more documentation, but I think it already explains users how to build their own modbus sensor to pair with Dragino RS485-BL.
560 -
561 -This is released the code under GNU LGPL licence on Github:
562 -
563 -[[https:~~/~~/github.com/zorbaproject/ArduinoModbusForDraginoRS485>>url:https://github.com/zorbaproject/ArduinoModbusForDraginoRS485]]
564 -
565 -
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