Last modified by Karry Zhuang on 2025/03/06 16:34
<
From version < 32.11 >
edited by Xiaoling
on 2022/06/02 15:26
To version < 35.3 >
edited by Xiaoling
on 2022/06/02 15:44
>
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -142,6 +142,8 @@
142 142  
143 143  (((
144 144  The RS485-LN is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the RS485-LN. It will auto join the network via OTAA.
145 +
146 +
145 145  )))
146 146  
147 147  == 3.2 Example to join LoRaWAN network ==
... ... @@ -150,10 +150,15 @@
150 150  
151 151  [[image:1653268155545-638.png||height="334" width="724"]]
152 152  
155 +
153 153  (((
157 +(((
154 154  The RS485-LN in this example connected to two RS485 devices for demonstration, user can connect to other RS485 devices via the same method. The connection is as below:
159 +)))
155 155  
161 +(((
156 156  485A+ and 485B- of the sensor are connected to RS485A and RA485B of RS485-LN respectively.
163 +)))
157 157  
158 158  [[image:1653268227651-549.png||height="592" width="720"]]
159 159  
... ... @@ -205,6 +205,7 @@
205 205  
206 206  [[image:1652953568895-172.png||height="232" width="724"]]
207 207  
215 +
208 208  == 3.3 Configure Commands to read data ==
209 209  
210 210  (((
... ... @@ -214,6 +214,8 @@
214 214  
215 215  (((
216 216  (% style="color:red" %)Note: below description and commands are for firmware version >v1.1, if you have firmware version v1.0. Please check the [[user manual v1.0>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/&file=RS485-LN_UserManual_v1.0.1.pdf]] or upgrade the firmware to v1.1
225 +
226 +
217 217  )))
218 218  )))
219 219  
... ... @@ -221,19 +221,19 @@
221 221  
222 222  To use RS485-LN to read data from RS485 sensors, connect the RS485-LN A/B traces to the sensors. And user need to make sure RS485-LN use the match UART setting to access the sensors. The related commands for UART settings are:
223 223  
224 -(% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
225 -|(((
234 +(% border="1" style="background-color:#ffffcc; color:green; width:782px" %)
235 +|(% style="width:128px" %)(((
226 226  **AT Commands**
227 -)))|(% style="width:285px" %)(((
237 +)))|(% style="width:305px" %)(((
228 228  **Description**
229 -)))|(% style="width:347px" %)(((
239 +)))|(% style="width:346px" %)(((
230 230  **Example**
231 231  )))
232 -|(((
242 +|(% style="width:128px" %)(((
233 233  AT+BAUDR
234 -)))|(% style="width:285px" %)(((
244 +)))|(% style="width:305px" %)(((
235 235  Set the baud rate (for RS485 connection). Default Value is: 9600.
236 -)))|(% style="width:347px" %)(((
246 +)))|(% style="width:346px" %)(((
237 237  (((
238 238  AT+BAUDR=9600
239 239  )))
... ... @@ -242,11 +242,11 @@
242 242  Options: (1200,2400,4800,14400,19200,115200)
243 243  )))
244 244  )))
245 -|(((
255 +|(% style="width:128px" %)(((
246 246  AT+PARITY
247 -)))|(% style="width:285px" %)(((
257 +)))|(% style="width:305px" %)(((
248 248  Set UART parity (for RS485 connection)
249 -)))|(% style="width:347px" %)(((
259 +)))|(% style="width:346px" %)(((
250 250  (((
251 251  AT+PARITY=0
252 252  )))
... ... @@ -255,9 +255,9 @@
255 255  Option: 0: no parity, 1: odd parity, 2: even parity
256 256  )))
257 257  )))
258 -|(((
268 +|(% style="width:128px" %)(((
259 259  AT+STOPBIT
260 -)))|(% style="width:285px" %)(((
270 +)))|(% style="width:305px" %)(((
261 261  (((
262 262  Set serial stopbit (for RS485 connection)
263 263  )))
... ... @@ -265,7 +265,7 @@
265 265  (((
266 266  
267 267  )))
268 -)))|(% style="width:347px" %)(((
278 +)))|(% style="width:346px" %)(((
269 269  (((
270 270  AT+STOPBIT=0 for 1bit
271 271  )))
... ... @@ -279,6 +279,8 @@
279 279  )))
280 280  )))
281 281  
292 +
293 +
282 282  === 3.3.2 Configure sensors ===
283 283  
284 284  (((
... ... @@ -297,80 +297,41 @@
297 297  mm: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
298 298  )))|(% style="width:256px" %)AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
299 299  
300 -=== 3.3.3 Configure read commands for each sampling ===
301 301  
302 -(((
303 -RS485-BL is a battery powered device; it will sleep most of time. And wake up on each period and read RS485 / TTL sensor data and uplink.
304 -)))
305 305  
306 -(((
307 -During each sampling, we need to confirm what commands we need to send to the sensors to read data. After the RS485/TTL sensors send back the value, it normally includes some bytes and we only need a few from them for a shorten payload.
308 -)))
314 +=== 3.3.3 Configure read commands for each sampling ===
309 309  
310 310  (((
317 +During each sampling, we need confirm what commands we need to send to the RS485 sensors to read data. After the RS485 sensors send back the value, it normally include some bytes and we only need a few from them for a shorten payload.
318 +
311 311  To save the LoRaWAN network bandwidth, we might need to read data from different sensors and combine their valid value into a short payload.
312 -)))
313 313  
314 -(((
315 315  This section describes how to achieve above goals.
316 -)))
317 317  
318 -(((
319 -During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
320 -)))
323 +During each sampling, the RS485-LN can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
321 321  
322 -(((
323 -**Command from RS485-BL to Sensor:**
324 -)))
325 325  
326 -(((
327 -RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
328 -)))
326 +**Each RS485 commands include two parts:**
329 329  
330 -(((
331 -**Handle return from sensors to RS485-BL**:
332 -)))
328 +~1. What commands RS485-LN will send to the RS485 sensors. There are total 15 commands from **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF**. All commands are of same grammar.
333 333  
334 -(((
335 -After RS485-BL send out a string to sensor, RS485-BL will wait for the return from RS485 or TTL sensor. And user can specify how to handle the return, by **AT+DATACUT or AT+SEARCH commands**
336 -)))
330 +2. How to get wanted value the from RS485 sensors returns from by 1). There are total 15 AT Commands to handle the return, commands are **AT+DATACUT1**,**AT+DATACUT2**,…, **AT+DATACUTF** corresponding to the commands from 1). All commands are of same grammar.
337 337  
338 -* (((
339 -**AT+DATACUT**
340 -)))
332 +3. Some RS485 device might has longer delay on reply, so user can use AT+CMDDL to set the timeout for getting reply after the RS485 command is sent. For example
341 341  
342 -(((
343 -When the return value from sensor have fix length and we know which position the valid value we should get, we can use AT+DATACUT command.
344 -)))
334 +**AT+CMDDL1=1000** to send the open time to 1000ms
345 345  
346 -* (((
347 -**AT+SEARCH**
348 -)))
349 349  
350 -(((
351 -When the return value from sensor is dynamic length and we are not sure which bytes the valid data is, instead, we know what value the valid value following. We can use AT+SEARCH to search the valid value in the return string.
352 -)))
353 -
354 -(((
355 -**Define wait timeout:**
356 -)))
357 -
358 -(((
359 -Some RS485 device might has longer delay on reply, so user can use AT+CMDDL to set the timeout for getting reply after the RS485 command is sent. For example, AT+CMDDL1=1000 to send the open time to 1000ms
360 -)))
361 -
362 -(((
363 363  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
364 -)))
365 365  
366 -**Examples:**
367 367  
368 368  Below are examples for the how above AT Commands works.
369 369  
370 -**AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
371 371  
372 -(% border="1" class="table-bordered" %)
373 -|(((
343 +**AT+COMMANDx : **This command will be sent to RS485 devices during each sampling, Max command length is 14 bytes. The grammar is:
344 +
345 +(% border="1" style="background-color:#4bacc6; color:white; width:499px" %)
346 +|(% style="width:496px" %)(((
374 374  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
375 375  
376 376  **xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent**
... ... @@ -378,90 +378,42 @@
378 378  **m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command**
379 379  )))
380 380  
381 -(((
382 382  For example, if we have a RS485 sensor. The command to get sensor value is: 01 03 0B B8 00 02 46 0A. Where 01 03 0B B8 00 02 is the Modbus command to read the register 0B B8 where stored the sensor value. The 46 0A is the CRC-16/MODBUS which calculate manually.
383 -)))
384 384  
385 -(((
386 -In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
387 -)))
356 +In the RS485-LN, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
388 388  
389 -(((
390 -**AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
391 -)))
392 392  
393 -(% border="1" class="table-bordered" %)
394 -|(((
395 -**AT+SEARCHx=aa,xx xx xx xx xx**
396 -
397 -* **aa: 1: prefix match mode; 2: prefix and suffix match mode**
398 -* **xx xx xx xx xx: match string. Max 5 bytes for prefix and 5 bytes for suffix**
399 -
400 -
401 -)))
402 -
403 -**Examples:**
404 -
405 -~1. For a return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
406 -
407 -If we set AT+SEARCH1=1,1E 56 34.      (max 5 bytes for prefix)
408 -
409 -The valid data will be all bytes after 1E 56 34 , so it is (% style="background-color:yellow" %)** 2e 30 58 5f 36 41 30 31 00 49**
410 -
411 -[[image:1653269403619-508.png]]
412 -
413 -2. For a return string from AT+COMMAND1:  16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
414 -
415 -If we set AT+SEARCH1=2, 1E 56 34+31 00 49
416 -
417 -Device will search the bytes between 1E 56 34 and 31 00 49. So it is (% style="background-color:yellow" %)** 2e 30 58 5f 36 41 30**
418 -
419 -[[image:1653269438444-278.png]]
420 -
421 421  **AT+DATACUTx : **This command defines how to handle the return from AT+COMMANDx, max return length is 45 bytes.
422 422  
423 -|(((
361 +(% border="1" style="background-color:#4bacc6; color:white; width:725px" %)
362 +|(% style="width:722px" %)(((
424 424  **AT+DATACUTx=a,b,c**
425 425  
426 426  * **a: length for the return of AT+COMMAND**
427 427  * **b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.**
428 -* **c: define the position for valid value.  **
367 +* **c: define the position for valid value. **
429 429  )))
430 430  
431 -Examples:
432 432  
371 +**Examples:**
372 +
433 433  * Grab bytes:
434 434  
435 -[[image:1653269551753-223.png||height="311" width="717"]]
375 +[[image:image-20220602153621-1.png]]
436 436  
377 +
437 437  * Grab a section.
438 438  
439 -[[image:1653269568276-930.png||height="325" width="718"]]
380 +[[image:image-20220602153621-2.png]]
440 440  
382 +
441 441  * Grab different sections.
442 442  
443 -[[image:1653269593172-426.png||height="303" width="725"]]
385 +[[image:image-20220602153621-3.png]]
444 444  
445 -(% style="color:red" %)**Note:**
387 +
388 +)))
446 446  
447 -AT+SEARCHx and AT+DATACUTx can be used together, if both commands are set, RS485-BL will first process AT+SEARCHx on the return string and get a temporary string, and then process AT+DATACUTx on this temporary string to get the final payload. In this case, AT+DATACUTx need to set to format AT+DATACUTx=0,xx,xx where the return bytes set to 0.
448 -
449 -Example:
450 -
451 -(% style="color:red" %)AT+COMMAND1=11 01 1E D0,0
452 -
453 -(% style="color:red" %)AT+SEARCH1=1,1E 56 34
454 -
455 -(% style="color:red" %)AT+DATACUT1=0,2,1~~5
456 -
457 -(% style="color:red" %)Return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
458 -
459 -(% style="color:red" %)String after SEARCH command: 2e 30 58 5f 36 41 30 31 00 49
460 -
461 -(% style="color:red" %)Valid payload after DataCUT command: 2e 30 58 5f 36
462 -
463 -[[image:1653269618463-608.png]]
464 -
465 465  === 3.3.4 Compose the uplink payload ===
466 466  
467 467  (((
image-20220602153621-1.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.Xiaoling
Size
... ... @@ -1,0 +1,1 @@
1 +23.4 KB
Content
image-20220602153621-2.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.Xiaoling
Size
... ... @@ -1,0 +1,1 @@
1 +22.2 KB
Content
image-20220602153621-3.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.Xiaoling
Size
... ... @@ -1,0 +1,1 @@
1 +22.3 KB
Content

Applications

Navigation

Copyright ©2010-2024 Dragino Technology Co., LTD. All rights reserved
Dragino Wiki v2.0