Last modified by Karry Zhuang on 2024/07/11 11:58
<
From version < 57.7 >
edited by Xiaoling
on 2022/07/14 09:20
To version < 74.1 >
edited by Karry Zhuang
on 2024/07/11 11:54
>
Change comment: Uploaded new attachment "1720670079781-764.png", version {1}

Summary

Details

Page properties
Author
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1 -XWiki.Xiaoling
1 +XWiki.karry
Content
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1 -(% class="wikigeneratedid" %)
2 - ** Table of** **Contents:**
1 +**Table of Contents:**
3 3  
4 4  {{toc/}}
5 5  
... ... @@ -8,66 +8,67 @@
8 8  
9 9  
10 10  
11 -= **1. Introduction** =
10 += 1. Introduction =
12 12  
13 13  
14 14  This article provide the examples for RS485-LN to connect to different type of RS485 sensors.
15 15  
16 16  
17 -== **1.1 Example 1: Connect to Leak relay and VFD** ==
16 +== 1.1 Example 1: Connect to Leak relay and VFD ==
18 18  
19 19  
20 20  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:
21 21  
22 -[[image:image-20220527091852-1.png]]
23 23  
24 -Connection
22 +[[image:image-20220527091852-1.png||height="547" width="994"]]
25 25  
24 +**Connection**
26 26  
27 27  
28 28  [[image:image-20220527091942-2.png]](% style="display:none" %)
29 29  
30 -Connection
29 +**Connection**
31 31  
32 32  
33 -Related documents:
32 +(% style="color:blue" %)**Related documents:**
34 34  
35 -* [[Solar Pump with Dragino>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/Relay_VFD/]] : System Structure
36 -* [[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.
37 -* [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
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);"]]
38 38  
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);"]]
39 39  
38 +* [[Video Demo>>url:https://www.youtube.com/watch?v=TAFZ5eaf-MY&t=6s&ab_channel=XavierFlorensaBerenguer]]
40 40  
41 41  
42 -== **1.2 Example 2: Connect to Pulse Counter** ==
41 +== 1.2 Example 2: Connect to Pulse Counter ==
43 43  
44 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  
47 47  
48 -[[image:image-20220527092058-3.png]]
47 +[[image:image-20220527092058-3.png||height="552" width="905"]]
49 49  
50 -Connection
49 +**Connection**
51 51  
52 52  
52 +[[image:image-20220527092146-4.png||height="507" width="906"]]
53 53  
54 -[[image:image-20220527092146-4.png]]
54 +**Connection**
55 55  
56 -Connection
57 57  
57 +(% style="color:blue" %)**Related documents:**
58 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/]]
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 +
60 60  * [[Dragino Solution in Farm>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/Application_Note/&file=Dragino%20on%20Farms.pptx]]
61 61  
62 62  
64 +== 1.3 Example 3: Use RS485-LN with energy meters ==
63 63  
66 +=== 1.3.1 OverView ===
64 64  
65 -== **1.3 Example3: Use RS485-LN with energy meters** ==
66 66  
67 -=== **1.3.1 OverView** ===
68 -
69 69  (((
70 -**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.**
71 71  )))
72 72  
73 73  (((
... ... @@ -76,12 +76,13 @@
76 76  
77 77  [[image:image-20220527092419-5.png]]
78 78  
79 -Connection1
79 +**Connection1**
80 80  
81 81  
82 -
83 83  (((
84 -How to connect with Energy Meter：
83 +(% style="color:blue" %)**How to connect with Energy Meter：**
84 +
85 +
85 85  )))
86 86  
87 87  (((
... ... @@ -93,11 +93,11 @@
93 93  )))
94 94  
95 95  (((
96 -Power Source VIN to RS485-LN VIN+
97 +Power Source **VIN** to RS485-LN **VIN+**
97 97  )))
98 98  
99 99  (((
100 -Power Source GND to RS485-LN VIN-
101 +Power Source **GND** to RS485-LN **VIN-**
101 101  )))
102 102  
103 103  (((
... ... @@ -106,75 +106,81 @@
106 106  
107 107  [[image:image-20220527092514-6.png]]
108 108  
109 -Connection2
110 +**Connection2**
110 110  
111 111  
112 -
113 113  [[image:image-20220527092555-7.png]]
114 114  
115 -Connection3
115 +**Connection3**
116 116  
117 117  
118 -=== **1.3.2 How to use the parameters of the energy meter and MODBUS commands** ===
118 +=== 1.3.2 How to use the parameters of the energy meter and MODBUS commands ===
119 119  
120 +
120 120  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.
121 121  
122 122  [[image:image-20220601143257-10.png]]
123 123  
124 124  
125 -(% class="box infomessage" %)
126 -(((
127 -**Example:** AT+COMMAND1=01 03 00 00 00 01 84 0A
128 -)))
126 +(% style="color:blue" %)**Example:**(%%)  AT+COMMAND1=01 03 00 00 00 01 84 0A
129 129  
130 130  * The first byte : slave address code (=001～247)
129 +
131 131  * The second byte : read register value function code
131 +
132 132  * 3rd and 4th bytes: start address of register to be read
133 +
133 133  * 5th and 6th bytes: Number of registers to read
135 +
134 134  * 7th and 8th bytes: CRC16 checksum from bytes 1 to 6.
135 135  
136 136  (((
139 +
140 +
141 +
137 137  How to parse the reading of the return command of the parameter：
138 -)))
139 139  
140 -(% class="box infomessage" %)
141 -(((
142 -**Example:** RETURN1：01 03 02 08 FD 7E 05
144 +(% style="color:blue" %)**Example:**(%%) RETURN1：01 03 02 08 FD 7E 05
143 143  )))
144 144  
145 145  * The first byte ARD: slave address code (=001～254)
148 +
146 146  * The second byte: Return to read function code
150 +
147 147  * 3rd byte: total number of bytes
152 +
148 148  * 4th～5th bytes: register data
154 +
149 149  * The 6th and 7th bytes: CRC16 checksum
156 +
150 150  * 08 FD is register data. Use short integer 16 bits to convert to decimal, get 2301, then 230.1V is the voltage.
151 151  
152 -(% class="wikigeneratedid" %)
153 -(((
154 -
155 -)))
156 156  
157 -=== **1.3.3 How to configure RS485-LN and parse output commands** ===
160 +=== 1.3.3 How to configure RS485-LN and parse output commands ===
158 158  
162 +
159 159  RS485-LN provides two configuration methods: AT COMMAND and DOWNLINK.
160 160  
161 161  
162 -==== **1.3.3.1 via AT COMMAND:** ====
166 +==== **1.3.3.1 via AT COMMAND** ====
163 163  
164 -First, we can use **AT+CFGDEV** to get the return value, and we can also judge whether the input parameters are correct.
165 165  
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 +
166 166  (((
167 167  If the configured parameters and commands are incorrect, the return value is not obtained.
173 +
174 +
168 168  )))
169 169  
170 170  [[image:image-20220601143201-9.png]]
171 171  
172 -AT COMMAND
179 +**AT COMMAND**
173 173  
174 174  
175 175  (% class="box infomessage" %)
176 176  (((
177 - 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
178 178  )))
179 179  
180 180  a:  length for the return of AT+COMMAND
... ... @@ -185,25 +185,22 @@
185 185  
186 186  [[image:image-20220601143115-8.png]]
187 187  
188 -AT COMMAND
195 +**AT COMMAND**
189 189  
190 190  
191 -
192 192  PAYLOAD is available after the valid value is intercepted.
193 193  
194 -
195 195  [[image:image-20220601143046-7.png]]
196 196  
197 -AT COMMAND
202 +**AT COMMAND**
198 198  
199 199  
200 -
201 201  You can get configured PAYLOAD on TTN.
202 202  
203 203  [[image:image-20220601143519-1.png]]
204 204  
205 205  (((
206 -AT COMMAND
210 +**AT COMMAND**
207 207  )))
208 208  
209 209  (((
... ... @@ -211,49 +211,49 @@
211 211  )))
212 212  
213 213  (((
214 -(% style="color:#4f81bd" %)**Example**:
218 +(% style="color:blue" %)**Example**:
215 215  
216 -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
217 217  )))
218 218  
219 219  (((
220 -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)
221 221  )))
222 222  
223 223  (((
224 -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.
225 225  
226 226  
227 227  )))
228 228  
229 229  (((
230 -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
231 231  )))
232 232  
233 233  (((
234 -RETURN2:01 03 02 08 DC BE 1D(return data)
238 +RETURN2: 01 03 02 08 DC BE 1D(return data)
235 235  )))
236 236  
237 237  (((
238 -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.
239 239  
240 240  
241 241  )))
242 242  
243 243  (((
244 -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
245 245  )))
246 246  
247 247  (((
248 -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)
249 249  )))
250 250  
251 251  (((
252 -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.
253 253  )))
254 254  
255 255  (((
256 -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
257 257  )))
258 258  
259 259  [[image:image-20220601142936-6.png]]
... ... @@ -261,10 +261,9 @@
261 261  AT COMMAND
262 262  
263 263  
264 -(% 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.**
265 265  
266 266  
267 -
268 268  [[image:image-20220601143642-2.png]]
269 269  
270 270  AT COMMAND
... ... @@ -272,18 +272,16 @@
272 272  
273 273  ==== **1.3.3.2 via LoRaWAN DOWNLINK** ====
274 274  
278 +
275 275  [[image:image-20220527093358-15.png]]
276 276  
277 277  (((
278 -DOWNLINK
282 +**DOWNLINK**
279 279  )))
280 280  
281 -(((
282 -
283 -)))
284 284  
285 285  (((
286 -(% style="color:#4f81bd" %)**Type Code 0xAF**
287 +(% style="color:blue" %)**Type Code 0xAF**
287 287  )))
288 288  
289 289  (((
... ... @@ -294,7 +294,7 @@
294 294  )))
295 295  
296 296  (((
297 -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.**
298 298  )))
299 299  
300 300  (((
... ... @@ -329,10 +329,9 @@
329 329  will execute an uplink after got this command.
330 330  )))
331 331  
332 -(((
333 -
334 334  
335 -(% style="color:#4f81bd" %)**Example:**
334 +(((
335 +(% style="color:blue" %)**Example:**
336 336  )))
337 337  
338 338  (((
... ... @@ -341,35 +341,32 @@
341 341  
342 342  [[image:image-20220601144149-6.png]]
343 343  
344 -DOWNLINK
344 +**DOWNLINK**
345 345  
346 346  
347 -
348 348  [[image:image-20220601143803-3.png]]
349 349  
350 -DOWNLINK
349 +**DOWNLINK**
351 351  
352 352  
353 -
354 354  [[image:image-20220601144053-5.png]]
355 355  
356 -DOWNLINK
354 +**DOWNLINK**
357 357  
358 358  
359 -
360 360  [[image:image-20220601143921-4.png]]
361 361  
362 -DOWNLINK
359 +**DOWNLINK**
363 363  
364 364  
365 -
366 366  [[image:image-20220601142805-5.png]]
367 367  
368 -DOWNLINK
369 -
364 +**DOWNLINK**
370 370  
371 -=== **1.3.4 How to configure and output commands for RS485 to USB** ===
372 372  
367 +=== 1.3.4 How to configure and output commands for RS485 to USB ===
368 +
369 +
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  )))
... ... @@ -392,13 +392,12 @@
392 392  
393 393  [[image:image-20220527093708-21.png]]
394 394  
395 -USB
392 +**USB**
396 396  
397 397  
398 -
399 399  [[image:image-20220527093747-22.png]]
400 400  
401 -USB
397 +**USB**
402 402  
403 403  
404 404  
... ... @@ -407,20 +407,23 @@
407 407  )))
408 408  
409 409  (((
410 -(% 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
411 411  )))
412 412  
413 413  (((
414 414   output：01 03 04 00 00 00 42 7A 02
411 +
412 +
415 415  )))
416 416  
417 417  [[image:image-20220527093821-23.png]]
418 418  
419 -USB
417 +**USB**
420 420  
421 421  
422 -=== **1.3.5 How to configure multiple devices and modify device addresses** ===
420 +=== 1.3.5 How to configure multiple devices and modify device addresses ===
423 423  
422 +
424 424  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.
425 425  
426 426  (((
... ... @@ -432,13 +432,15 @@
432 432  [[image:image-20220601142044-1.png]]
433 433  
434 434  
435 -**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.
436 436  
436 +
437 437  [[image:image-20220527093950-25.png]]
438 438  
439 439  
440 440  [[image:image-20220527094028-26.png]]
441 441  
442 +
442 442  (((
443 443  (((
444 444  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.
... ... @@ -447,7 +447,7 @@
447 447  
448 448  (((
449 449  (((
450 -We can use AT+CFGDEV to set the device address.
451 +We can use (% style="color:blue" %)**AT+CFGDEV**(%%) to set the device address.
451 451  )))
452 452  )))
453 453  
... ... @@ -459,14 +459,15 @@
459 459  
460 460  [[image:image-20220601142354-2.png]]
461 461  
463 +
462 462  (% class="box infomessage" %)
463 463  (((
464 464  **AT+CFGDEV:01 10 00 61 00 01 02 00 02,1**
465 465  )))
466 466  
467 -* 01:device adaress
469 +* 01: device adaress
468 468  
469 -* 10:function code
471 +* 10: function code
470 470  
471 471  * 00 61：Register address
472 472  
... ... @@ -489,40 +489,77 @@
489 489  
490 490  [[image:image-20220601142607-4.png]]
491 491  
492 -**PAYLOAD:01 08 DF 43 62**
493 493  
495 +(% style="color:blue" %)**PAYLOAD: 01 08 DF 43 62**
496 +
494 494  * 08 DF is the valid value of the meter with device address 02.
495 495  * 43 62 is the valid value of the meter with device address 01.
496 496  
500 +(% style="display:none" %) (%%)
497 497  
502 +
498 498  == 1.4 Example 4: Circuit Breaker Remote Open Close ==
499 499  
500 -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:
501 501  
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 +
502 502  [[image:image-20220527094330-30.png]]
503 503  
504 -Connection
512 +**Connection**
505 505  
506 -* [[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
507 507  
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 +
517 +
508 508  == 1.5 Example 5: SEM Three Energy Meter with RS485-BL or RS485-LN ==
509 509  
520 +
510 510  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:
511 511  
512 -* [[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);"]]
513 513  
514 -* [[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"]]
515 515  
516 -== 1.6 Example 6:CEM C31 485-T1-MID Energy Meter with RS485-LN ==
517 517  
528 +== 1.6 Example 6: CEM C31 485-T1-MID Energy Meter with RS485-LN ==
529 +
530 +
518 518  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:
519 519  
520 -* [[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);"]]
521 521  
522 -== 1.7 Example 7:Schneider Electric PLC M221 with RS485-BL ==
523 523  
536 +== 1.7 Example 7: Schneider Electric PLC M221 with RS485-BL ==
537 +
538 +
524 524  [[image:image-20220527094556-31.png]]
525 525  
541 +
526 526  Network Structure
527 527  
528 528  * [[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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