Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 75.1 >
edited by Karry Zhuang
on 2024/07/11 11:54
To version < 50.1 >
edited by Xiaoling
on 2022/06/01 14:32
>
Change comment: Uploaded new attachment "image-20220601143201-9.png", version {1}

Summary

Details

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Author
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1 -XWiki.karry
1 +XWiki.Xiaoling
Content
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1 -**Table of Contents:**
1 +(% class="wikigeneratedid" %)
2 + **Contents:**
2 2  
3 3  {{toc/}}
4 4  
... ... @@ -7,67 +7,60 @@
7 7  
8 8  
9 9  
10 -= 1. Introduction =
11 += **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 15  
16 -== 1.1 Example 1: Connect to Leak relay and VFD ==
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  
20 +[[image:image-20220527091852-1.png]]
21 21  
22 -[[image:image-20220527091852-1.png||height="547" width="994"]]
22 +Connection
23 23  
24 -**Connection**
25 25  
26 26  
27 27  [[image:image-20220527091942-2.png]](% style="display:none" %)
28 28  
29 -**Connection**
28 +Connection
30 30  
31 31  
32 -(% style="color:blue" %)**Related documents:**
31 +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 -
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.
38 38  * [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
39 39  
40 40  
41 -== 1.2 Example 2: Connect to Pulse Counter ==
42 42  
39 +== **1.2 Example 2: Connect to Pulse Counter** ==
43 43  
44 44  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:
45 45  
43 +[[image:image-20220527092058-3.png]]
46 46  
47 -[[image:image-20220527092058-3.png||height="552" width="905"]]
45 +Connection
48 48  
49 -**Connection**
50 50  
51 51  
52 -[[image:image-20220527092146-4.png||height="507" width="906"]]
49 +[[image:image-20220527092146-4.png]]
53 53  
54 -**Connection**
51 +Connection
55 55  
56 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 -
54 +* [[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
61 61  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
62 62  
57 +== ==
63 63  
64 -== 1.3 Example 3: Use RS485-LN with energy meters ==
59 +== **1.3 Example3: Use RS485-LN with energy meters** ==
65 65  
66 -=== 1.3.1 OverView ===
61 +=== **1.3.1 OverView** ===
67 67  
68 -
69 69  (((
70 -(% style="color:red" %)**Note**：**The specifications of each energy meter are different, please refer to your own energy meter specifications.**
64 +**Note**：The specifications of each energy meter are different, please refer to your own energy meter specifications.
71 71  )))
72 72  
73 73  (((
... ... @@ -76,13 +76,12 @@
76 76  
77 77  [[image:image-20220527092419-5.png]]
78 78  
79 -**Connection1**
73 +Connection1
80 80  
81 81  
82 -(((
83 -(% style="color:blue" %)**How to connect with Energy Meter：**
84 84  
85 -
77 +(((
78 +How to connect with Energy Meter：
86 86  )))
87 87  
88 88  (((
... ... @@ -94,11 +94,11 @@
94 94  )))
95 95  
96 96  (((
97 -Power Source **VIN** to RS485-LN **VIN+**
90 +Power Source VIN to RS485-LN VIN+
98 98  )))
99 99  
100 100  (((
101 -Power Source **GND** to RS485-LN **VIN-**
94 +Power Source GND to RS485-LN VIN-
102 102  )))
103 103  
104 104  (((
... ... @@ -107,81 +107,75 @@
107 107  
108 108  [[image:image-20220527092514-6.png]]
109 109  
110 -**Connection2**
103 +Connection2
111 111  
112 112  
106 +
113 113  [[image:image-20220527092555-7.png]]
114 114  
115 -**Connection3**
109 +Connection3
116 116  
117 117  
118 -=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
112 +=== **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
119 119  
120 -
121 121  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.
122 122  
123 -[[image:image-20220601143257-10.png]]
116 +[[image:image-20220527092629-8.png]]
124 124  
125 125  
126 -(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
119 +(% class="box infomessage" %)
120 +(((
121 +**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
122 +)))
127 127  
128 128  * The first byte : slave address code (=001～247)
129 -
130 130  * The second byte : read register value function code
131 -
132 132  * 3rd and 4th bytes: start address of register to be read
133 -
134 134  * 5th and 6th bytes: Number of registers to read
135 -
136 136  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
137 137  
138 138  (((
139 -
140 -
141 -
142 142  How to parse the reading of the return command of the parameter：
132 +)))
143 143  
144 -(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
134 +(% class="box infomessage" %)
135 +(((
136 +**Example:** RETURN1：01 03 02 08 FD 7E 05
145 145  )))
146 146  
147 147  * The first byte ARD: slave address code (=001～254)
148 -
149 149  * The second byte: Return to read function code
150 -
151 151  * 3rd byte: total number of bytes
152 -
153 153  * 4th～5th bytes: register data
154 -
155 155  * The 6th and 7th bytes: CRC16 checksum
156 -
157 157  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
158 158  
146 +(% class="wikigeneratedid" %)
147 +(((
148 +
149 +)))
159 159  
160 -=== 1.3.3 How to configure RS485-LN and parse output commands ===
151 +=== **1.3.3 How to configure RS485-LN and parse output commands** ===
161 161  
162 -
163 163  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
164 164  
165 165  
166 -==== **1.3.3.1 via AT COMMAND** ====
156 +==== **1.3.3.1 via AT COMMAND:** ====
167 167  
158 +First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
168 168  
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 -
171 171  (((
172 172  If the configured parameters and commands are incorrect, the return value is not obtained.
173 -
174 -
175 175  )))
176 176  
177 -[[image:image-20220601143201-9.png]]
164 +[[image:image-20220527092748-9.png]]
178 178  
179 -**AT COMMAND**
166 +AT COMMAND
180 180  
181 181  
182 182  (% class="box infomessage" %)
183 183  (((
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
171 + AT+DATACUTx : This command defines how to handle the return from AT+COMMANDx, max reture length is 40 bytes. AT+DATACUTx=a,b,c
185 185  )))
186 186  
187 187  a:  length for the return of AT+COMMAND
... ... @@ -190,24 +190,27 @@
190 190  
191 191  c:  define the position for valid value.
192 192  
193 -[[image:image-20220601143115-8.png]]
180 +[[image:image-20220527092936-10.png]]
194 194  
195 -**AT COMMAND**
182 +AT COMMAND
196 196  
197 197  
185 +
198 198  PAYLOAD is available after the valid value is intercepted.
199 199  
188 +
200 200  [[image:image-20220601143046-7.png]]
201 201  
202 -**AT COMMAND**
191 +AT COMMAND
203 203  
204 204  
194 +
205 205  You can get configured PAYLOAD on TTN.
206 206  
207 -[[image:image-20220601143519-1.png]]
197 +[[image:image-20220527093133-12.png]]
208 208  
209 209  (((
210 -**AT COMMAND**
200 +AT COMMAND
211 211  )))
212 212  
213 213  (((
... ... @@ -215,49 +215,49 @@
215 215  )))
216 216  
217 217  (((
218 -(% style="color:blue" %)**Example**:
208 +(% style="color:#4f81bd" %)**Example**:
219 219  
220 -(% style="color:red" %)**CMD1:**(%%) Read current data with MODBUS command. address: 0x03 AT+COMMAND1= 01 03 00 03 00 01,1
210 +CMD1:Read current data with MODBUS command. address:0x03 AT+COMMAND1= 01 03 00 03 00 01,1
221 221  )))
222 222  
223 223  (((
224 -RETURN1: 01 03 02 00 02 39 85 00 00(return data)
214 +RETURN1:01 03 02 00 02 39 85 00 00(return data)
225 225  )))
226 226  
227 227  (((
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.
218 +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.
229 229  
230 230  
231 231  )))
232 232  
233 233  (((
234 -(% style="color:red" %)**CMD2: **(%%)Read voltage data with MODBUS command. address: 0x00 AT+COMMAND2= 01 03 00 00 00 01,1
224 +CMD2:Read voltage data with MODBUS command. address:0x00 AT+COMMAND2= 01 03 00 00 00 01,1
235 235  )))
236 236  
237 237  (((
238 -RETURN2: 01 03 02 08 DC BE 1D(return data)
228 +RETURN2:01 03 02 08 DC BE 1D(return data)
239 239  )))
240 240  
241 241  (((
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.
232 +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.
243 243  
244 244  
245 245  )))
246 246  
247 247  (((
248 -(% style="color:red" %)**CMD3:**(%%) Read total active energy data with MODBUS command. address: 0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
238 +CMD3:Read total active energy data with MODBUS command. address:0x0031 AT+COMMAND3= 01 03 00 31 00 02,1
249 249  )))
250 250  
251 251  (((
252 -RETURN3: 01 03 04 00 00 00 44 FA 00(return data)
242 +RETURN3:01 03 04 00 00 00 44 FA 00(return data)
253 253  )))
254 254  
255 255  (((
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.
246 +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.
257 257  )))
258 258  
259 259  (((
260 -Payload: 01 00 02 39 85 08 DC 00 00 00 44
250 +Payload:01 00 02 39 85 08 DC 00 00 00 44
261 261  )))
262 262  
263 263  [[image:image-20220601142936-6.png]]
... ... @@ -265,26 +265,29 @@
265 265  AT COMMAND
266 266  
267 267  
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.**
258 +(% 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.**
269 269  
270 270  
271 -[[image:image-20220601143642-2.png]]
272 272  
262 +[[image:image-20220527093251-14.png]]
263 +
273 273  AT COMMAND
274 274  
275 275  
276 276  ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
277 277  
278 -
279 279  [[image:image-20220527093358-15.png]]
280 280  
281 281  (((
282 -**DOWNLINK**
272 +DOWNLINK
283 283  )))
284 284  
275 +(((
276 +
277 +)))
285 285  
286 286  (((
287 -(% style="color:blue" %)**Type Code 0xAF**
280 +(% style="color:#4f81bd" %)**Type Code 0xAF**
288 288  )))
289 289  
290 290  (((
... ... @@ -295,7 +295,7 @@
295 295  )))
296 296  
297 297  (((
298 -(% style="color:red" %)**Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.**
291 +Note: if user use AT+COMMANDx to add a new command, he also need to send AT+DATACUTx downlink.
299 299  )))
300 300  
301 301  (((
... ... @@ -330,9 +330,10 @@
330 330  will execute an uplink after got this command.
331 331  )))
332 332  
333 -
334 334  (((
335 -(% style="color:blue" %)**Example:**
327 +
328 +
329 +(% style="color:#4f81bd" %)**Example:**
336 336  )))
337 337  
338 338  (((
... ... @@ -339,34 +339,37 @@
339 339  **AF 03 01 06 0A 05 00 04 00 01 00**: Same as AT+COMMAND3=0A 05 00 04 00 01,1
340 340  )))
341 341  
342 -[[image:image-20220601144149-6.png]]
336 +[[image:image-20220527093430-16.png]]
343 343  
344 -**DOWNLINK**
338 +DOWNLINK
345 345  
346 346  
347 -[[image:image-20220601143803-3.png]]
348 348  
349 -**DOWNLINK**
342 +[[image:image-20220527093508-17.png]]
350 350  
344 +DOWNLINK
351 351  
352 -[[image:image-20220601144053-5.png]]
353 353  
354 -**DOWNLINK**
355 355  
348 +[[image:image-20220527093530-18.png]]
356 356  
357 -[[image:image-20220601143921-4.png]]
350 +DOWNLINK
358 358  
359 -**DOWNLINK**
360 360  
361 361  
362 -[[image:image-20220601142805-5.png]]
354 +[[image:image-20220527093607-19.png]]
363 363  
364 -**DOWNLINK**
356 +DOWNLINK
365 365  
366 366  
367 -=== 1.3.4 How to configure and output commands for RS485 to USB ===
368 368  
360 +[[image:image-20220601142805-5.png]]
369 369  
362 +DOWNLINK
363 +
364 +
365 +=== **1.3.4 How to configure and output commands for RS485 to USB** ===
366 +
370 370  (((
371 371  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.
372 372  )))
... ... @@ -389,12 +389,13 @@
389 389  
390 390  [[image:image-20220527093708-21.png]]
391 391  
392 -**USB**
389 +USB
393 393  
394 394  
392 +
395 395  [[image:image-20220527093747-22.png]]
396 396  
397 -**USB**
395 +USB
398 398  
399 399  
400 400  
... ... @@ -403,23 +403,20 @@
403 403  )))
404 404  
405 405  (((
406 -(% style="color:blue" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
404 +(% style="color:#4f81bd" %)**Example:**  (%%)input：01 03 00 31 00 02 95 c4
407 407  )))
408 408  
409 409  (((
410 410   output：01 03 04 00 00 00 42 7A 02
411 -
412 -
413 413  )))
414 414  
415 415  [[image:image-20220527093821-23.png]]
416 416  
417 -**USB**
413 +USB
418 418  
419 419  
420 -=== 1.3.5 How to configure multiple devices and modify device addresses ===
416 +=== **1.3.5 How to configure multiple devices and modify device addresses** ===
421 421  
422 -
423 423  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.
424 424  
425 425  (((
... ... @@ -431,15 +431,12 @@
431 431  [[image:image-20220601142044-1.png]]
432 432  
433 433  
434 -(% style="color:blue" %)**Example**(%%): These two meters are examples of setting parameters and device addresses.
429 +**Example**:These two meters are examples of setting parameters and device addresses.
435 435  
436 -
437 437  [[image:image-20220527093950-25.png]]
438 438  
439 -
440 440  [[image:image-20220527094028-26.png]]
441 441  
442 -
443 443  (((
444 444  (((
445 445  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.
... ... @@ -448,7 +448,7 @@
448 448  
449 449  (((
450 450  (((
451 -We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
443 +We can use AT+CFGDEV to set the device address.
452 452  )))
453 453  )))
454 454  
... ... @@ -460,15 +460,14 @@
460 460  
461 461  [[image:image-20220601142354-2.png]]
462 462  
463 -
464 464  (% class="box infomessage" %)
465 465  (((
466 466  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
467 467  )))
468 468  
469 -* 01: device adaress
460 +* 01:device adaress
470 470  
471 -* 10: function code
462 +* 10:function code
472 472  
473 473  * 00 61：Register address
474 474  
... ... @@ -491,77 +491,45 @@
491 491  
492 492  [[image:image-20220601142607-4.png]]
493 493  
485 +**PAYLOAD:01 08 DF 43 62**
494 494  
495 -(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
496 -
497 497  * 08 DF is the valid value of the meter with device address 02.
498 498  * 43 62 is the valid value of the meter with device address 01.
499 499  
500 -(% style="display:none" %) (%%)
501 501  
502 -
503 503  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
504 504  
493 +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:
505 505  
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 -
510 510  [[image:image-20220527094330-30.png]]
511 511  
512 -**Connection**
497 +Connection
513 513  
499 +* [[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 -* 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"]]
516 516  
517 -
518 518  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
519 519  
520 -
521 521  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:
522 522  
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);"]]
506 +* [[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
524 524  
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"]]
508 +* [[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
526 526  
527 527  
528 -== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
529 529  
512 +== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
530 530  
531 531  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:
532 532  
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);"]]
516 +* [[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
534 534  
535 535  
536 -== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
537 537  
520 +== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
538 538  
539 539  [[image:image-20220527094556-31.png]]
540 540  
541 -
542 542  Network Structure
543 543  
544 544  * [[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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