Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 41.4 >
edited by Xiaoling
on 2022/05/30 11:24
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  
... ... @@ -10,54 +10,67 @@
10 10  
11 11  = 1. Introduction =
12 12  
12 +
13 13  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
14 14  
15 15  
16 16  == 1.1 Example 1: Connect to Leak relay and VFD ==
17 17  
18 +
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]]
21 21  
22 -Connection
22 +[[image:image-20220527091852-1.png||height="547" width="994"]]
23 23  
24 +**Connection**
24 24  
25 25  
26 26  [[image:image-20220527091942-2.png]](% style="display:none" %)
27 27  
28 -Connection
29 +**Connection**
29 29  
30 30  
31 -Related documents:
32 +(% style="color:blue" %)**Related documents:**
32 32  
33 -* [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
34 -* [[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 +
35 35  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
36 36  
40 +
41 +
37 37  == 1.2 Example 2: Connect to Pulse Counter ==
38 38  
44 +
39 39  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:
40 40  
41 -[[image:image-20220527092058-3.png]]
42 42  
43 -Connection
48 +[[image:image-20220527092058-3.png||height="552" width="905"]]
44 44  
50 +**Connection**
45 45  
46 -[[image:image-20220527092146-4.png]]
47 47  
48 -Connection
53 +[[image:image-20220527092146-4.png||height="507" width="906"]]
49 49  
50 -* [[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 +
51 51  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
52 52  
53 -== ==
54 54  
55 -== 1.3 Example3: Use RS485-LN with energy meters ==
56 56  
66 +== 1.3 Example 3: Use RS485-LN with energy meters ==
67 +
57 57  === 1.3.1 OverView ===
58 58  
70 +
59 59  (((
60 -**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.**
61 61  )))
62 62  
63 63  (((
... ... @@ -66,11 +66,13 @@
66 66  
67 67  [[image:image-20220527092419-5.png]]
68 68  
69 -Connection1
81 +**Connection1**
70 70  
71 71  
72 72  (((
73 -How to connect with Energy Meter：
85 +(% style="color:blue" %)**How to connect with Energy Meter：**
86 +
87 +
74 74  )))
75 75  
76 76  (((
... ... @@ -82,11 +82,11 @@
82 82  )))
83 83  
84 84  (((
85 -Power Source VIN to RS485-LN VIN+
99 +Power Source **VIN** to RS485-LN **VIN+**
86 86  )))
87 87  
88 88  (((
89 -Power Source GND to RS485-LN VIN-
103 +Power Source **GND** to RS485-LN **VIN-**
90 90  )))
91 91  
92 92  (((
... ... @@ -95,101 +95,108 @@
95 95  
96 96  [[image:image-20220527092514-6.png]]
97 97  
98 -Connection2
112 +**Connection2**
99 99  
100 100  
101 101  [[image:image-20220527092555-7.png]]
102 102  
103 -Connection3
117 +**Connection3**
104 104  
105 105  
106 106  === 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
107 107  
122 +
108 108  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.
109 109  
110 -[[image:image-20220527092629-8.png]]
125 +[[image:image-20220601143257-10.png]]
111 111  
112 112  
113 -(% class="box infomessage" %)
114 -(((
115 -**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
116 -)))
128 +(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
117 117  
118 118  * The first byte : slave address code (=001～247)
131 +
119 119  * The second byte : read register value function code
133 +
120 120  * 3rd and 4th bytes: start address of register to be read
135 +
121 121  * 5th and 6th bytes: Number of registers to read
137 +
122 122  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
123 123  
124 124  (((
141 +
142 +
143 +
125 125  How to parse the reading of the return command of the parameter：
126 -)))
127 127  
128 -(% class="box infomessage" %)
129 -(((
130 -**Example:** RETURN1：01 03 02 08 FD 7E 05
146 +(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
131 131  )))
132 132  
133 133  * The first byte ARD: slave address code (=001～254)
150 +
134 134  * The second byte: Return to read function code
152 +
135 135  * 3rd byte: total number of bytes
154 +
136 136  * 4th～5th bytes: register data
156 +
137 137  * The 6th and 7th bytes: CRC16 checksum
158 +
138 138  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
139 139  
140 -(% class="wikigeneratedid" %)
141 -(((
142 -
143 -)))
144 144  
145 -=== **1.3.3 How to configure RS485-LN and parse output commands** ===
146 146  
163 +=== 1.3.3 How to configure RS485-LN and parse output commands ===
164 +
165 +
147 147  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
148 148  
149 149  
150 -==== **1.3.3.1 via AT COMMAND:** ====
169 +==== **1.3.3.1 via AT COMMAND** ====
151 151  
152 -First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
153 153  
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 +
154 154  (((
155 155  If the configured parameters and commands are incorrect, the return value is not obtained.
176 +
177 +
156 156  )))
157 157  
158 -[[image:image-20220527092748-9.png]]
180 +[[image:image-20220601143201-9.png]]
159 159  
160 -AT COMMAND
182 +**AT COMMAND**
161 161  
162 162  
163 163  (% class="box infomessage" %)
164 164  (((
165 - 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
166 166  )))
167 167  
168 -a: length for the return of AT+COMMAND
190 +a:  length for the return of AT+COMMAND
169 169  
170 -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.
171 171  
172 -c: define the position for valid value.
194 +c:  define the position for valid value.
173 173  
174 -[[image:image-20220527092936-10.png]]
196 +[[image:image-20220601143115-8.png]]
175 175  
176 -AT COMMAND
198 +**AT COMMAND**
177 177  
178 178  
179 179  PAYLOAD is available after the valid value is intercepted.
180 180  
203 +[[image:image-20220601143046-7.png]]
181 181  
182 -[[image:image-20220527093059-11.png]]
205 +**AT COMMAND**
183 183  
184 -AT COMMAND
185 185  
186 -
187 187  You can get configured PAYLOAD on TTN.
188 188  
189 -[[image:image-20220527093133-12.png]]
210 +[[image:image-20220601143519-1.png]]
190 190  
191 191  (((
192 -AT COMMAND
213 +**AT COMMAND**
193 193  )))
194 194  
195 195  (((
... ... @@ -197,77 +197,76 @@
197 197  )))
198 198  
199 199  (((
200 -(% style="color:#4f81bd" %)**Example**:
221 +(% style="color:blue" %)**Example**:
201 201  
202 -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
203 203  )))
204 204  
205 205  (((
206 -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)
207 207  )))
208 208  
209 209  (((
210 -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.
211 211  
212 212  
213 213  )))
214 214  
215 215  (((
216 -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
217 217  )))
218 218  
219 219  (((
220 -RETURN2:01 03 02 08 DC BE 1D(return data)
241 +RETURN2: 01 03 02 08 DC BE 1D(return data)
221 221  )))
222 222  
223 223  (((
224 -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.
225 225  
226 226  
227 227  )))
228 228  
229 229  (((
230 -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
231 231  )))
232 232  
233 233  (((
234 -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)
235 235  )))
236 236  
237 237  (((
238 -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.
239 239  )))
240 240  
241 241  (((
242 -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
243 243  )))
244 244  
245 -[[image:image-20220527093204-13.png]]
266 +[[image:image-20220601142936-6.png]]
246 246  
247 247  AT COMMAND
248 248  
249 249  
250 -(% 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.**
251 251  
252 -[[image:image-20220527093251-14.png]]
253 253  
274 +[[image:image-20220601143642-2.png]]
275 +
254 254  AT COMMAND
255 255  
256 256  
257 257  ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
258 258  
281 +
259 259  [[image:image-20220527093358-15.png]]
260 260  
261 261  (((
262 -DOWNLINK
285 +**DOWNLINK**
263 263  )))
264 264  
265 -(((
266 -
267 -)))
268 268  
269 269  (((
270 -(% style="color:#4f81bd" %)**Type Code 0xAF**
290 +(% style="color:blue" %)**Type Code 0xAF**
271 271  )))
272 272  
273 273  (((
... ... @@ -278,7 +278,7 @@
278 278  )))
279 279  
280 280  (((
281 -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.**
282 282  )))
283 283  
284 284  (((
... ... @@ -313,8 +313,9 @@
313 313  will execute an uplink after got this command.
314 314  )))
315 315  
336 +
316 316  (((
317 -(% style="color:#4f81bd" %)**Example:**
338 +(% style="color:blue" %)**Example:**
318 318  )))
319 319  
320 320  (((
... ... @@ -321,33 +321,34 @@
321 321  **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
322 322  )))
323 323  
324 -[[image:image-20220527093430-16.png]]
345 +[[image:image-20220601144149-6.png]]
325 325  
326 -DOWNLINK
347 +**DOWNLINK**
327 327  
328 328  
329 -[[image:image-20220527093508-17.png]]
350 +[[image:image-20220601143803-3.png]]
330 330  
331 -DOWNLINK
352 +**DOWNLINK**
332 332  
333 333  
334 -[[image:image-20220527093530-18.png]]
355 +[[image:image-20220601144053-5.png]]
335 335  
336 -DOWNLINK
357 +**DOWNLINK**
337 337  
338 338  
339 -[[image:image-20220527093607-19.png]]
360 +[[image:image-20220601143921-4.png]]
340 340  
341 -DOWNLINK
362 +**DOWNLINK**
342 342  
343 343  
344 -[[image:image-20220527093628-20.png]]
365 +[[image:image-20220601142805-5.png]]
345 345  
346 -DOWNLINK
347 -
367 +**DOWNLINK**
348 348  
349 -=== **1.3.4 How to configure and output commands for RS485 to USB** ===
350 350  
370 +=== 1.3.4 How to configure and output commands for RS485 to USB ===
371 +
372 +
351 351  (((
352 352  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.
353 353  )))
... ... @@ -370,33 +370,37 @@
370 370  
371 371  [[image:image-20220527093708-21.png]]
372 372  
373 -USB
395 +**USB**
374 374  
375 375  
376 376  [[image:image-20220527093747-22.png]]
377 377  
378 -USB
400 +**USB**
379 379  
380 380  
403 +
381 381  (((
382 382  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.
383 383  )))
384 384  
385 385  (((
386 -(% 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
387 387  )))
388 388  
389 389  (((
390 390   output：01 03 04 00 00 00 42 7A 02
414 +
415 +
391 391  )))
392 392  
393 393  [[image:image-20220527093821-23.png]]
394 394  
395 -USB
420 +**USB**
396 396  
397 397  
398 -=== **1.3.5 How to configure multiple devices and modify device addresses** ===
423 +=== 1.3.5 How to configure multiple devices and modify device addresses ===
399 399  
425 +
400 400  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.
401 401  
402 402  (((
... ... @@ -405,15 +405,18 @@
405 405  )))
406 406  )))
407 407  
408 -[[image:image-20220527093849-24.png]]
434 +[[image:image-20220601142044-1.png]]
409 409  
410 410  
411 -**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.
412 412  
439 +
413 413  [[image:image-20220527093950-25.png]]
414 414  
442 +
415 415  [[image:image-20220527094028-26.png]]
416 416  
445 +
417 417  (((
418 418  (((
419 419  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.
... ... @@ -422,7 +422,7 @@
422 422  
423 423  (((
424 424  (((
425 -We can use AT+CFGDEV to set the device address.
454 +We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
426 426  )))
427 427  )))
428 428  
... ... @@ -432,16 +432,17 @@
432 432  )))
433 433  )))
434 434  
435 -[[image:image-20220527094100-27.png]]
464 +[[image:image-20220601142354-2.png]]
436 436  
466 +
437 437  (% class="box infomessage" %)
438 438  (((
439 439  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
440 440  )))
441 441  
442 -* 01:device adaress
472 +* 01: device adaress
443 443  
444 -* 10:function code
474 +* 10: function code
445 445  
446 446  * 00 61：Register address
447 447  
... ... @@ -459,52 +459,77 @@
459 459  
460 460  Its default device address is 01, and the following are the parameters for configuring two energy meters.
461 461  
462 -[[image:image-20220527094150-28.png]]
492 +[[image:image-20220601142452-3.png]]
463 463  
464 464  
465 -[[image:image-20220527094224-29.png]]
495 +[[image:image-20220601142607-4.png]]
466 466  
467 -**PAYLOAD:01 08 DF 43 62**
468 468  
498 +(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
499 +
469 469  * 08 DF is the valid value of the meter with device address 02.
470 470  * 43 62 is the valid value of the meter with device address 01.
471 471  
503 +(% style="display:none" %) (%%)
472 472  
473 473  
474 474  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
475 475  
476 -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:
477 477  
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 +
478 478  [[image:image-20220527094330-30.png]]
479 479  
480 -Connection
515 +**Connection**
481 481  
482 -* [[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
483 483  
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"]]
484 484  
485 485  
521 +
486 486  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
487 487  
524 +
488 488  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:
489 489  
490 -* [[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);"]]
491 491  
492 -* [[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"]]
493 493  
494 494  
495 495  
496 -== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
533 +== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
497 497  
535 +
498 498  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:
499 499  
500 -* [[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);"]]
501 501  
502 502  
503 503  
504 -== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
542 +== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
505 505  
544 +
506 506  [[image:image-20220527094556-31.png]]
507 507  
547 +
508 508  Network Structure
509 509  
510 510  * [[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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