Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 40.1 >
edited by Xiaoling
on 2022/05/27 09:54
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edited by Karry Zhuang
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Author
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1 -XWiki.Xiaoling
1 +XWiki.karry
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  
10 10  
11 11  == 1.1 Example 1: Connect to Leak relay and VFD ==
12 12  
18 +
13 13  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:
14 14  
15 -[[image:image-20220527091852-1.png]]
16 16  
17 -Connection
22 +[[image:image-20220527091852-1.png||height="547" width="994"]]
18 18  
24 +**Connection**
19 19  
20 20  
21 21  [[image:image-20220527091942-2.png]](% style="display:none" %)
22 22  
23 -Connection
29 +**Connection**
24 24  
25 25  
26 -Related documents:
32 +(% style="color:blue" %)**Related documents:**
27 27  
28 -* [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
29 -* [[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.
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 +
30 30  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
31 31  
40 +
32 32  == 1.2 Example 2: Connect to Pulse Counter ==
33 33  
43 +
34 34  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:
35 35  
36 -[[image:image-20220527092058-3.png]]
37 37  
38 -Connection
47 +[[image:image-20220527092058-3.png||height="552" width="905"]]
39 39  
49 +**Connection**
40 40  
41 -[[image:image-20220527092146-4.png]]
42 42  
43 -Connection
52 +[[image:image-20220527092146-4.png||height="507" width="906"]]
44 44  
45 -* [[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
54 +**Connection**
55 +
56 +
57 +(% style="color:blue" %)**Related documents:**
58 +
59 +* 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"]]
60 +
46 46  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
47 47  
48 -== ==
49 49  
50 -== 1.3 Example3: Use RS485-LN with energy meters ==
64 +== 1.3 Example 3: Use RS485-LN with energy meters ==
51 51  
52 52  === 1.3.1 OverView ===
53 53  
68 +
54 54  (((
55 -**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
70 +(% style="color:red" %)**Note**：**The specifications of each energy meter are different, please refer to your own energy meter specifications.**
56 56  )))
57 57  
58 58  (((
... ... @@ -61,11 +61,13 @@
61 61  
62 62  [[image:image-20220527092419-5.png]]
63 63  
64 -Connection1
79 +**Connection1**
65 65  
66 66  
67 67  (((
68 -How to connect with Energy Meter：
83 +(% style="color:blue" %)**How to connect with Energy Meter：**
84 +
85 +
69 69  )))
70 70  
71 71  (((
... ... @@ -77,11 +77,11 @@
77 77  )))
78 78  
79 79  (((
80 -Power Source VIN to RS485-LN VIN+
97 +Power Source **VIN** to RS485-LN **VIN+**
81 81  )))
82 82  
83 83  (((
84 -Power Source GND to RS485-LN VIN-
101 +Power Source **GND** to RS485-LN **VIN-**
85 85  )))
86 86  
87 87  (((
... ... @@ -90,101 +90,107 @@
90 90  
91 91  [[image:image-20220527092514-6.png]]
92 92  
93 -Connection2
110 +**Connection2**
94 94  
95 95  
96 96  [[image:image-20220527092555-7.png]]
97 97  
98 -Connection3
115 +**Connection3**
99 99  
100 100  
101 101  === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
102 102  
120 +
103 103  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.
104 104  
105 -[[image:image-20220527092629-8.png]]
123 +[[image:image-20220601143257-10.png]]
106 106  
107 107  
108 -(% class="box infomessage" %)
109 -(((
110 -**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
111 -)))
126 +(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
112 112  
113 113  * The first byte : slave address code (=001～247)
129 +
114 114  * The second byte : read register value function code
131 +
115 115  * 3rd and 4th bytes: start address of register to be read
133 +
116 116  * 5th and 6th bytes: Number of registers to read
135 +
117 117  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
118 118  
119 119  (((
139 +
140 +
141 +
120 120  How to parse the reading of the return command of the parameter：
121 -)))
122 122  
123 -(% class="box infomessage" %)
124 -(((
125 -**Example:** RETURN1：01 03 02 08 FD 7E 05
144 +(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
126 126  )))
127 127  
128 128  * The first byte ARD: slave address code (=001～254)
148 +
129 129  * The second byte: Return to read function code
150 +
130 130  * 3rd byte: total number of bytes
152 +
131 131  * 4th～5th bytes: register data
154 +
132 132  * The 6th and 7th bytes: CRC16 checksum
156 +
133 133  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
134 134  
135 -(% class="wikigeneratedid" %)
136 -(((
137 -
138 -)))
139 139  
140 140  === 1.3.3 How to configure RS485-LN and parse output commands ===
141 141  
162 +
142 142  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
143 143  
144 144  
145 -==== 1.3.3.1 via AT COMMAND: ====
166 +==== **1.3.3.1 via AT COMMAND** ====
146 146  
147 -First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
148 148  
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 +
149 149  (((
150 150  If the configured parameters and commands are incorrect, the return value is not obtained.
173 +
174 +
151 151  )))
152 152  
153 -[[image:image-20220527092748-9.png]]
177 +[[image:image-20220601143201-9.png]]
154 154  
155 -AT COMMAND
179 +**AT COMMAND**
156 156  
157 157  
158 158  (% class="box infomessage" %)
159 159  (((
160 - AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
184 + (% _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
161 161  )))
162 162  
163 -a: length for the return of AT+COMMAND
187 +a:  length for the return of AT+COMMAND
164 164  
165 -b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
189 +b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
166 166  
167 -c: define the position for valid value.
191 +c:  define the position for valid value.
168 168  
169 -[[image:image-20220527092936-10.png]]
193 +[[image:image-20220601143115-8.png]]
170 170  
171 -AT COMMAND
195 +**AT COMMAND**
172 172  
173 173  
174 174  PAYLOAD is available after the valid value is intercepted.
175 175  
200 +[[image:image-20220601143046-7.png]]
176 176  
177 -[[image:image-20220527093059-11.png]]
202 +**AT COMMAND**
178 178  
179 -AT COMMAND
180 180  
181 -
182 182  You can get configured PAYLOAD on TTN.
183 183  
184 -[[image:image-20220527093133-12.png]]
207 +[[image:image-20220601143519-1.png]]
185 185  
186 186  (((
187 -AT COMMAND
210 +**AT COMMAND**
188 188  )))
189 189  
190 190  (((
... ... @@ -192,77 +192,76 @@
192 192  )))
193 193  
194 194  (((
195 -(% style="color:#4f81bd" %)**Example**:
218 +(% style="color:blue" %)**Example**:
196 196  
197 -CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
220 +(% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
198 198  )))
199 199  
200 200  (((
201 -RETURN1:01 03 02 00 02 39 85 00 00(return data)
224 +RETURN1: 01 03 02 00 02 39 85 00 00(return data)
202 202  )))
203 203  
204 204  (((
205 -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.
228 +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.
206 206  
207 207  
208 208  )))
209 209  
210 210  (((
211 -CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
234 +(% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
212 212  )))
213 213  
214 214  (((
215 -RETURN2:01 03 02 08 DC BE 1D(return data)
238 +RETURN2: 01 03 02 08 DC BE 1D(return data)
216 216  )))
217 217  
218 218  (((
219 -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.
242 +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.
220 220  
221 221  
222 222  )))
223 223  
224 224  (((
225 -CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
248 +(% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
226 226  )))
227 227  
228 228  (((
229 -RETURN3:01 03 04 00 00 00 44 FA 00(return data)
252 +RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
230 230  )))
231 231  
232 232  (((
233 -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.
256 +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.
234 234  )))
235 235  
236 236  (((
237 -Payload:01 00 02 39 85 08 DC 00 00 00 44
260 +Payload: 01 00 02 39 85 08 DC 00 00 00 44
238 238  )))
239 239  
240 -[[image:image-20220527093204-13.png]]
263 +[[image:image-20220601142936-6.png]]
241 241  
242 242  AT COMMAND
243 243  
244 244  
245 -(% 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.**
268 +(% 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.**
246 246  
247 -[[image:image-20220527093251-14.png]]
248 248  
271 +[[image:image-20220601143642-2.png]]
272 +
249 249  AT COMMAND
250 250  
251 251  
252 -==== 1.3.3.2 via LoRaWAN DOWNLINK ====
276 +==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
253 253  
278 +
254 254  [[image:image-20220527093358-15.png]]
255 255  
256 256  (((
257 -DOWNLINK
282 +**DOWNLINK**
258 258  )))
259 259  
260 -(((
261 -
262 -)))
263 263  
264 264  (((
265 -(% style="color:#4f81bd" %)**Type Code 0xAF**
287 +(% style="color:blue" %)**Type Code 0xAF**
266 266  )))
267 267  
268 268  (((
... ... @@ -273,7 +273,7 @@
273 273  )))
274 274  
275 275  (((
276 -Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
298 +(% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
277 277  )))
278 278  
279 279  (((
... ... @@ -308,8 +308,9 @@
308 308  will execute an uplink after got this command.
309 309  )))
310 310  
333 +
311 311  (((
312 -(% style="color:#4f81bd" %)**Example:**
335 +(% style="color:blue" %)**Example:**
313 313  )))
314 314  
315 315  (((
... ... @@ -316,33 +316,34 @@
316 316  **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
317 317  )))
318 318  
319 -[[image:image-20220527093430-16.png]]
342 +[[image:image-20220601144149-6.png]]
320 320  
321 -DOWNLINK
344 +**DOWNLINK**
322 322  
323 323  
324 -[[image:image-20220527093508-17.png]]
347 +[[image:image-20220601143803-3.png]]
325 325  
326 -DOWNLINK
349 +**DOWNLINK**
327 327  
328 328  
329 -[[image:image-20220527093530-18.png]]
352 +[[image:image-20220601144053-5.png]]
330 330  
331 -DOWNLINK
354 +**DOWNLINK**
332 332  
333 333  
334 -[[image:image-20220527093607-19.png]]
357 +[[image:image-20220601143921-4.png]]
335 335  
336 -DOWNLINK
359 +**DOWNLINK**
337 337  
338 338  
339 -[[image:image-20220527093628-20.png]]
362 +[[image:image-20220601142805-5.png]]
340 340  
341 -DOWNLINK
342 -
364 +**DOWNLINK**
343 343  
366 +
344 344  === 1.3.4 How to configure and output commands for RS485 to USB ===
345 345  
369 +
346 346  (((
347 347  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.
348 348  )))
... ... @@ -365,33 +365,37 @@
365 365  
366 366  [[image:image-20220527093708-21.png]]
367 367  
368 -USB
392 +**USB**
369 369  
370 370  
371 371  [[image:image-20220527093747-22.png]]
372 372  
373 -USB
397 +**USB**
374 374  
375 375  
400 +
376 376  (((
377 377  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.
378 378  )))
379 379  
380 380  (((
381 -(% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
406 +(% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
382 382  )))
383 383  
384 384  (((
385 385   output：01 03 04 00 00 00 42 7A 02
411 +
412 +
386 386  )))
387 387  
388 388  [[image:image-20220527093821-23.png]]
389 389  
390 -USB
417 +**USB**
391 391  
392 392  
393 393  === 1.3.5 How to configure multiple devices and modify device addresses ===
394 394  
422 +
395 395  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.
396 396  
397 397  (((
... ... @@ -400,15 +400,18 @@
400 400  )))
401 401  )))
402 402  
403 -[[image:image-20220527093849-24.png]]
431 +[[image:image-20220601142044-1.png]]
404 404  
405 405  
406 -**Example**:These two meters are examples of setting parameters and device addresses.
434 +(% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
407 407  
436 +
408 408  [[image:image-20220527093950-25.png]]
409 409  
439 +
410 410  [[image:image-20220527094028-26.png]]
411 411  
442 +
412 412  (((
413 413  (((
414 414  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.
... ... @@ -417,7 +417,7 @@
417 417  
418 418  (((
419 419  (((
420 -We can use AT+CFGDEV to set the device address.
451 +We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
421 421  )))
422 422  )))
423 423  
... ... @@ -427,16 +427,17 @@
427 427  )))
428 428  )))
429 429  
430 -[[image:image-20220527094100-27.png]]
461 +[[image:image-20220601142354-2.png]]
431 431  
463 +
432 432  (% class="box infomessage" %)
433 433  (((
434 434  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
435 435  )))
436 436  
437 -* 01:device adaress
469 +* 01: device adaress
438 438  
439 -* 10:function code
471 +* 10: function code
440 440  
441 441  * 00 61：Register address
442 442  
... ... @@ -454,48 +454,82 @@
454 454  
455 455  Its default device address is 01, and the following are the parameters for configuring two energy meters.
456 456  
457 -[[image:image-20220527094150-28.png]]
489 +[[image:image-20220601142452-3.png]]
458 458  
459 459  
460 -[[image:image-20220527094224-29.png]]
492 +[[image:image-20220601142607-4.png]]
461 461  
462 -**PAYLOAD:01 08 DF 43 62**
463 463  
495 +(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
496 +
464 464  * 08 DF is the valid value of the meter with device address 02.
465 465  * 43 62 is the valid value of the meter with device address 01.
466 466  
500 +(% style="display:none" %) (%%)
467 467  
502 +
468 468  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
469 469  
470 -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:
471 471  
506 +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.
507 +
508 +The structure is like below:
509 +
472 472  [[image:image-20220527094330-30.png]]
473 473  
474 -Connection
512 +**Connection**
475 475  
476 -* [[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
477 477  
515 +* 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"]]
478 478  
517 +
479 479  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
480 480  
520 +
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-BL to connect to SEM Three Energy Meter and send the data to mobile phone for remote minitor. The structure is like below:
482 482  
483 -* [[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
523 +* 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);"]]
484 484  
485 -* [[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
525 +* 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"]]
486 486  
487 487  
488 -== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
528 +== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
489 489  
530 +
490 490  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:
491 491  
492 -* [[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
533 +* 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);"]]
493 493  
494 494  
495 -== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
536 +== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
496 496  
538 +
497 497  [[image:image-20220527094556-31.png]]
498 498  
541 +
499 499  Network Structure
500 500  
501 501  * [[Reference Instruction>>url:https://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Schneider%20Electric%20PLC/]]
545 +
546 +
547 +== 1.8 Example 8: This sketch is supposed to test Dragino RS485-BL (Modbus master), using an Arduino UNO as a Modbus slave. ==
548 +
549 +
550 +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.
551 +
552 +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.
553 +
554 +This is released the code under GNU LGPL licence on Github:
555 +
556 +[[https:~~/~~/github.com/zorbaproject/ArduinoModbusForDraginoRS485>>url:https://github.com/zorbaproject/ArduinoModbusForDraginoRS485]]
557 +
558 +
559 +== 1.9 Example 9: RS485-LN and ultrasonic flow meter transmission data ==
560 +
561 +
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 +
564 +
565 +
566 +* **Specific steps**:  RS485-LN with ultrasonic flow meter
567 +*
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