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<
From version < 40.2 >
edited by Xiaoling
on 2022/05/27 09:55
To version < 62.2 >
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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  
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  
32 32  
41 +
33 33  == 1.2 Example 2: Connect to Pulse Counter ==
34 34  
44 +
35 35  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:
36 36  
37 -[[image:image-20220527092058-3.png]]
38 38  
39 -Connection
48 +[[image:image-20220527092058-3.png||height="552" width="905"]]
40 40  
50 +**Connection**
41 41  
42 -[[image:image-20220527092146-4.png]]
43 43  
44 -Connection
53 +[[image:image-20220527092146-4.png||height="507" width="906"]]
45 45  
46 -* [[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
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 +
47 47  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
48 48  
49 -== ==
50 50  
51 -== 1.3 Example3: Use RS485-LN with energy meters ==
52 52  
66 +== 1.3 Example 3: Use RS485-LN with energy meters ==
67 +
53 53  === 1.3.1 OverView ===
54 54  
70 +
55 55  (((
56 -**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
72 +(% style="color:red" %)**Note**：**The specifications of each energy meter are different, please refer to your own energy meter specifications.**
57 57  )))
58 58  
59 59  (((
... ... @@ -62,11 +62,13 @@
62 62  
63 63  [[image:image-20220527092419-5.png]]
64 64  
65 -Connection1
81 +**Connection1**
66 66  
67 67  
68 68  (((
69 -How to connect with Energy Meter：
85 +(% style="color:blue" %)**How to connect with Energy Meter：**
86 +
87 +
70 70  )))
71 71  
72 72  (((
... ... @@ -78,11 +78,11 @@
78 78  )))
79 79  
80 80  (((
81 -Power Source VIN to RS485-LN VIN+
99 +Power Source **VIN** to RS485-LN **VIN+**
82 82  )))
83 83  
84 84  (((
85 -Power Source GND to RS485-LN VIN-
103 +Power Source **GND** to RS485-LN **VIN-**
86 86  )))
87 87  
88 88  (((
... ... @@ -91,101 +91,108 @@
91 91  
92 92  [[image:image-20220527092514-6.png]]
93 93  
94 -Connection2
112 +**Connection2**
95 95  
96 96  
97 97  [[image:image-20220527092555-7.png]]
98 98  
99 -Connection3
117 +**Connection3**
100 100  
101 101  
102 102  === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
103 103  
122 +
104 104  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.
105 105  
106 -[[image:image-20220527092629-8.png]]
125 +[[image:image-20220601143257-10.png]]
107 107  
108 108  
109 -(% class="box infomessage" %)
110 -(((
111 -**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
112 -)))
128 +(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
113 113  
114 114  * The first byte : slave address code (=001～247)
131 +
115 115  * The second byte : read register value function code
133 +
116 116  * 3rd and 4th bytes: start address of register to be read
135 +
117 117  * 5th and 6th bytes: Number of registers to read
137 +
118 118  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
119 119  
120 120  (((
141 +
142 +
143 +
121 121  How to parse the reading of the return command of the parameter：
122 -)))
123 123  
124 -(% class="box infomessage" %)
125 -(((
126 -**Example:** RETURN1：01 03 02 08 FD 7E 05
146 +(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
127 127  )))
128 128  
129 129  * The first byte ARD: slave address code (=001～254)
150 +
130 130  * The second byte: Return to read function code
152 +
131 131  * 3rd byte: total number of bytes
154 +
132 132  * 4th～5th bytes: register data
156 +
133 133  * The 6th and 7th bytes: CRC16 checksum
158 +
134 134  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
135 135  
136 -(% class="wikigeneratedid" %)
137 -(((
138 -
139 -)))
140 140  
162 +
141 141  === 1.3.3 How to configure RS485-LN and parse output commands ===
142 142  
165 +
143 143  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
144 144  
145 145  
146 -==== 1.3.3.1 via AT COMMAND: ====
169 +==== **1.3.3.1 via AT COMMAND** ====
147 147  
148 -First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
149 149  
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 +
150 150  (((
151 151  If the configured parameters and commands are incorrect, the return value is not obtained.
176 +
177 +
152 152  )))
153 153  
154 -[[image:image-20220527092748-9.png]]
180 +[[image:image-20220601143201-9.png]]
155 155  
156 -AT COMMAND
182 +**AT COMMAND**
157 157  
158 158  
159 159  (% class="box infomessage" %)
160 160  (((
161 - AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
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
162 162  )))
163 163  
164 -a: length for the return of AT+COMMAND
190 +a:  length for the return of AT+COMMAND
165 165  
166 -b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.
192 +b: 1: grab valid value by byte, max 6 bytes;  2: grab valid value by bytes section, max 3 sections.
167 167  
168 -c: define the position for valid value.
194 +c:  define the position for valid value.
169 169  
170 -[[image:image-20220527092936-10.png]]
196 +[[image:image-20220601143115-8.png]]
171 171  
172 -AT COMMAND
198 +**AT COMMAND**
173 173  
174 174  
175 175  PAYLOAD is available after the valid value is intercepted.
176 176  
203 +[[image:image-20220601143046-7.png]]
177 177  
178 -[[image:image-20220527093059-11.png]]
205 +**AT COMMAND**
179 179  
180 -AT COMMAND
181 181  
182 -
183 183  You can get configured PAYLOAD on TTN.
184 184  
185 -[[image:image-20220527093133-12.png]]
210 +[[image:image-20220601143519-1.png]]
186 186  
187 187  (((
188 -AT COMMAND
213 +**AT COMMAND**
189 189  )))
190 190  
191 191  (((
... ... @@ -193,77 +193,76 @@
193 193  )))
194 194  
195 195  (((
196 -(% style="color:#4f81bd" %)**Example**:
221 +(% style="color:blue" %)**Example**:
197 197  
198 -CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
223 +(% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
199 199  )))
200 200  
201 201  (((
202 -RETURN1:01 03 02 00 02 39 85 00 00(return data)
227 +RETURN1: 01 03 02 00 02 39 85 00 00(return data)
203 203  )))
204 204  
205 205  (((
206 -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.
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.
207 207  
208 208  
209 209  )))
210 210  
211 211  (((
212 -CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
237 +(% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
213 213  )))
214 214  
215 215  (((
216 -RETURN2:01 03 02 08 DC BE 1D(return data)
241 +RETURN2: 01 03 02 08 DC BE 1D(return data)
217 217  )))
218 218  
219 219  (((
220 -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.
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.
221 221  
222 222  
223 223  )))
224 224  
225 225  (((
226 -CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
251 +(% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
227 227  )))
228 228  
229 229  (((
230 -RETURN3:01 03 04 00 00 00 44 FA 00(return data)
255 +RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
231 231  )))
232 232  
233 233  (((
234 -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.
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.
235 235  )))
236 236  
237 237  (((
238 -Payload:01 00 02 39 85 08 DC 00 00 00 44
263 +Payload: 01 00 02 39 85 08 DC 00 00 00 44
239 239  )))
240 240  
241 -[[image:image-20220527093204-13.png]]
266 +[[image:image-20220601142936-6.png]]
242 242  
243 243  AT COMMAND
244 244  
245 245  
246 -(% 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.**
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.**
247 247  
248 -[[image:image-20220527093251-14.png]]
249 249  
274 +[[image:image-20220601143642-2.png]]
275 +
250 250  AT COMMAND
251 251  
252 252  
253 -==== 1.3.3.2 via LoRaWAN DOWNLINK ====
279 +==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
254 254  
281 +
255 255  [[image:image-20220527093358-15.png]]
256 256  
257 257  (((
258 -DOWNLINK
285 +**DOWNLINK**
259 259  )))
260 260  
261 -(((
262 -
263 -)))
264 264  
265 265  (((
266 -(% style="color:#4f81bd" %)**Type Code 0xAF**
290 +(% style="color:blue" %)**Type Code 0xAF**
267 267  )))
268 268  
269 269  (((
... ... @@ -274,7 +274,7 @@
274 274  )))
275 275  
276 276  (((
277 -Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
301 +(% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
278 278  )))
279 279  
280 280  (((
... ... @@ -309,8 +309,9 @@
309 309  will execute an uplink after got this command.
310 310  )))
311 311  
336 +
312 312  (((
313 -(% style="color:#4f81bd" %)**Example:**
338 +(% style="color:blue" %)**Example:**
314 314  )))
315 315  
316 316  (((
... ... @@ -317,33 +317,34 @@
317 317  **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
318 318  )))
319 319  
320 -[[image:image-20220527093430-16.png]]
345 +[[image:image-20220601144149-6.png]]
321 321  
322 -DOWNLINK
347 +**DOWNLINK**
323 323  
324 324  
325 -[[image:image-20220527093508-17.png]]
350 +[[image:image-20220601143803-3.png]]
326 326  
327 -DOWNLINK
352 +**DOWNLINK**
328 328  
329 329  
330 -[[image:image-20220527093530-18.png]]
355 +[[image:image-20220601144053-5.png]]
331 331  
332 -DOWNLINK
357 +**DOWNLINK**
333 333  
334 334  
335 -[[image:image-20220527093607-19.png]]
360 +[[image:image-20220601143921-4.png]]
336 336  
337 -DOWNLINK
362 +**DOWNLINK**
338 338  
339 339  
340 -[[image:image-20220527093628-20.png]]
365 +[[image:image-20220601142805-5.png]]
341 341  
342 -DOWNLINK
343 -
367 +**DOWNLINK**
344 344  
369 +
345 345  === 1.3.4 How to configure and output commands for RS485 to USB ===
346 346  
372 +
347 347  (((
348 348  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.
349 349  )))
... ... @@ -366,33 +366,37 @@
366 366  
367 367  [[image:image-20220527093708-21.png]]
368 368  
369 -USB
395 +**USB**
370 370  
371 371  
372 372  [[image:image-20220527093747-22.png]]
373 373  
374 -USB
400 +**USB**
375 375  
376 376  
403 +
377 377  (((
378 378  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.
379 379  )))
380 380  
381 381  (((
382 -(% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
409 +(% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
383 383  )))
384 384  
385 385  (((
386 386   output：01 03 04 00 00 00 42 7A 02
414 +
415 +
387 387  )))
388 388  
389 389  [[image:image-20220527093821-23.png]]
390 390  
391 -USB
420 +**USB**
392 392  
393 393  
394 394  === 1.3.5 How to configure multiple devices and modify device addresses ===
395 395  
425 +
396 396  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.
397 397  
398 398  (((
... ... @@ -401,15 +401,18 @@
401 401  )))
402 402  )))
403 403  
404 -[[image:image-20220527093849-24.png]]
434 +[[image:image-20220601142044-1.png]]
405 405  
406 406  
407 -**Example**:These two meters are examples of setting parameters and device addresses.
437 +(% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
408 408  
439 +
409 409  [[image:image-20220527093950-25.png]]
410 410  
442 +
411 411  [[image:image-20220527094028-26.png]]
412 412  
445 +
413 413  (((
414 414  (((
415 415  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.
... ... @@ -418,7 +418,7 @@
418 418  
419 419  (((
420 420  (((
421 -We can use AT+CFGDEV to set the device address.
454 +We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
422 422  )))
423 423  )))
424 424  
... ... @@ -428,16 +428,17 @@
428 428  )))
429 429  )))
430 430  
431 -[[image:image-20220527094100-27.png]]
464 +[[image:image-20220601142354-2.png]]
432 432  
466 +
433 433  (% class="box infomessage" %)
434 434  (((
435 435  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
436 436  )))
437 437  
438 -* 01:device adaress
472 +* 01: device adaress
439 439  
440 -* 10:function code
474 +* 10: function code
441 441  
442 442  * 00 61：Register address
443 443  
... ... @@ -455,48 +455,77 @@
455 455  
456 456  Its default device address is 01, and the following are the parameters for configuring two energy meters.
457 457  
458 -[[image:image-20220527094150-28.png]]
492 +[[image:image-20220601142452-3.png]]
459 459  
460 460  
461 -[[image:image-20220527094224-29.png]]
495 +[[image:image-20220601142607-4.png]]
462 462  
463 -**PAYLOAD:01 08 DF 43 62**
464 464  
498 +(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
499 +
465 465  * 08 DF is the valid value of the meter with device address 02.
466 466  * 43 62 is the valid value of the meter with device address 01.
467 467  
503 +(% style="display:none" %) (%%)
468 468  
505 +
469 469  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
470 470  
471 -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:
472 472  
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.
510 +
511 +The structure is like below:
512 +
473 473  [[image:image-20220527094330-30.png]]
474 474  
475 -Connection
515 +**Connection**
476 476  
477 -* [[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
478 478  
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"]]
479 479  
520 +
521 +
480 480  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
481 481  
524 +
482 482  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:
483 483  
484 -* [[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
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);"]]
485 485  
486 -* [[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
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"]]
487 487  
488 488  
489 -== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
490 490  
533 +== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
534 +
535 +
491 491  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:
492 492  
493 -* [[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
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);"]]
494 494  
495 495  
496 -== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
497 497  
542 +== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
543 +
544 +
498 498  [[image:image-20220527094556-31.png]]
499 499  
547 +
500 500  Network Structure
501 501  
502 502  * [[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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