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Last modified by Xiaoling on 2025/04/23 15:57
From version 27.1
edited by Xiaoling
on 2022/05/23 10:28
Change comment: Uploaded new attachment "1653272901032-107.png", version {1}
To version 15.4
edited by Xiaoling
on 2022/05/19 17:48
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Summary

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... ... @@ -60,7 +60,7 @@
60 60  * Power Consumption (exclude RS485 device):
61 61  ** Idle: 6uA@3.3v
62 62  
63 -*
63 +*
64 64  ** 20dB Transmit: 130mA@3.3v
65 65  
66 66  **Interface for Model:**
... ... @@ -219,186 +219,143 @@
219 219  
220 220  [[image:1652953568895-172.png||height="232" width="724"]]
221 221  
222 -== 3.3 Configure Commands to read data ==
223 223  
224 -(((
223 +
224 +
225 +1.
226 +11. Configure Commands to read data
227 +
225 225  There are plenty of RS485 and TTL level devices in the market and each device has different command to read the valid data. To support these devices in flexible, RS485-BL supports flexible command set. User can use [[AT Commands or LoRaWAN Downlink>>path:#AT_COMMAND]] Command to configure how RS485-BL should read the sensor and how to handle the return from RS485 or TTL sensors.
226 -)))
227 227  
228 -=== 3.3.1 onfigure UART settings for RS485 or TTL communication ===
229 229  
231 +1.
232 +11.
233 +111. Configure UART settings for RS485 or TTL communication
234 +
230 230  RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
231 231  
232 -**~1. RS485-MODBUS mode:**
237 +1. RS485-MODBUS mode:
233 233  
234 234  AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
235 235  
236 -**2. TTL mode:**
237 237  
242 +1. TTL mode:
243 +
238 238  AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
239 239  
246 +
240 240  RS485-BL default UART settings is **9600, no parity, stop bit 1**. If the sensor has a different settings, user can change the RS485-BL setting to match.
241 241  
242 -(% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
243 -|(((
244 -**AT Commands**
245 -)))|(% style="width:285px" %)(((
246 -**Description**
247 -)))|(% style="width:347px" %)(((
248 -**Example**
249 -)))
250 -|(((
251 -AT+BAUDR
252 -)))|(% style="width:285px" %)(((
253 -Set the baud rate (for RS485 connection). Default Value is: 9600.
254 -)))|(% style="width:347px" %)(((
255 -(((
249 +
250 +|**AT Commands**|**Description**|**Example**
251 +|AT+BAUDR|Set the baud rate (for RS485 connection). Default Value is: 9600.|(((
256 256  AT+BAUDR=9600
257 -)))
258 258  
259 -(((
260 260  Options: (1200,2400,4800,14400,19200,115200)
261 261  )))
262 -)))
263 -|(((
264 -AT+PARITY
265 -)))|(% style="width:285px" %)(((
266 -(((
256 +|AT+PARITY|(((
267 267  Set UART parity (for RS485 connection)
268 -)))
269 269  
270 -(((
271 271  Default Value is: no parity.
272 -)))
273 -)))|(% style="width:347px" %)(((
274 -(((
260 +)))|(((
275 275  AT+PARITY=0
276 -)))
277 277  
278 -(((
279 279  Option: 0: no parity, 1: odd parity, 2: even parity
280 280  )))
281 -)))
282 -|(((
283 -AT+STOPBIT
284 -)))|(% style="width:285px" %)(((
285 -(((
265 +|AT+STOPBIT|(((
286 286  Set serial stopbit (for RS485 connection)
287 -)))
288 288  
289 -(((
290 290  Default Value is: 1bit.
291 -)))
292 -)))|(% style="width:347px" %)(((
293 -(((
269 +)))|(((
294 294  AT+STOPBIT=0 for 1bit
295 -)))
296 296  
297 -(((
298 298  AT+STOPBIT=1 for 1.5 bit
299 -)))
300 300  
301 -(((
302 302  AT+STOPBIT=2 for 2 bits
303 303  )))
304 -)))
305 305  
306 -=== 3.3.2 Configure sensors ===
307 307  
308 -(((
309 -Some sensors might need to configure before normal operation. User can configure such sensor via PC or through RS485-BL AT Commands (% style="color:#4f81bd" %)**AT+CFGDEV**.
310 -)))
311 311  
312 -(((
313 -When user issue an (% style="color:#4f81bd" %)**AT+CFGDEV**(%%) command, Each (% style="color:#4f81bd" %)**AT+CFGDEV**(%%) equals to send a command to the RS485 or TTL sensors. This command will only run when user input it and won’t run during each sampling.
314 -)))
315 315  
316 -(% border="1" style="background-color:#ffffcc; color:green; width:806px" %)
317 -|**AT Commands**|(% style="width:418px" %)**Description**|(% style="width:256px" %)**Example**
318 -|AT+CFGDEV|(% style="width:418px" %)(((
280 +1.
281 +11.
282 +111. Configure sensors
283 +
284 +Some sensors might need to configure before normal operation. User can configure such sensor via PC or through RS485-BL AT Commands AT+CFGDEV.
285 +
286 +
287 +When user issue an AT+CFGDEV command, Each AT+CFGDEV equals to send a command to the RS485 or TTL sensors. This command will only run when user input it and won’t run during each sampling.
288 +
289 +|**AT Commands**|**Description**|**Example**
290 +|AT+CFGDEV|(((
319 319  This command is used to configure the RS485/TTL devices; they won’t be used during sampling.
320 320  
321 -AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,
293 +AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
322 322  
323 -mm: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
324 -)))|(% style="width:256px" %)AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
295 +m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
296 +)))|AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
325 325  
326 326  Detail of AT+CFGDEV command see [[AT+CFGDEV detail>>path:#AT_CFGDEV]].
327 327  
328 -=== 3.3.3 Configure read commands for each sampling ===
329 329  
330 -(((
301 +
302 +
303 +
304 +1.
305 +11.
306 +111. Configure read commands for each sampling
307 +
331 331  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.
332 -)))
333 333  
334 -(((
310 +
335 335  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.
336 -)))
337 337  
338 -(((
313 +
339 339  To save the LoRaWAN network bandwidth, we might need to read data from different sensors and combine their valid value into a short payload.
340 -)))
341 341  
342 -(((
316 +
343 343  This section describes how to achieve above goals.
344 -)))
345 345  
346 -(((
319 +
347 347  During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
348 -)))
349 349  
350 -(((
322 +
351 351  **Command from RS485-BL to Sensor:**
352 -)))
353 353  
354 -(((
355 355  RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
356 -)))
357 357  
358 -(((
327 +
359 359  **Handle return from sensors to RS485-BL**:
360 -)))
361 361  
362 -(((
363 363  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**
364 -)))
365 365  
366 -* (((
367 -**AT+DATACUT**
368 -)))
369 369  
370 -(((
333 +* **AT+DATACUT**
334 +
371 371  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.
372 -)))
373 373  
374 -* (((
375 -**AT+SEARCH**
376 -)))
377 377  
378 -(((
338 +* **AT+SEARCH**
339 +
379 379  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.
380 -)))
381 381  
382 -(((
342 +
383 383  **Define wait timeout:**
384 -)))
385 385  
386 -(((
387 387  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
388 -)))
389 389  
390 -(((
347 +
391 391  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
392 -)))
393 393  
350 +
394 394  **Examples:**
395 395  
396 396  Below are examples for the how above AT Commands works.
397 397  
355 +
398 398  **AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
399 399  
400 -(% border="1" class="table-bordered" style="background-color:#4f81bd; color:white; width:501px" %)
401 -|(% style="width:498px" %)(((
358 +|(((
402 402  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
403 403  
404 404  **xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent**
... ... @@ -410,38 +410,41 @@
410 410  
411 411  In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
412 412  
370 +
413 413  **AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
414 414  
415 -(% border="1" class="table-bordered" style="background-color:#4f81bd; color:white; width:580px" %)
416 -|(% style="width:577px" %)(((
373 +|(((
417 417  **AT+SEARCHx=aa,xx xx xx xx xx**
418 418  
419 419  * **aa: 1: prefix match mode; 2: prefix and suffix match mode**
420 420  * **xx xx xx xx xx: match string. Max 5 bytes for prefix and 5 bytes for suffix**
378 +
379 +
421 421  )))
422 422  
423 -**Examples:**
382 +Examples:
424 424  
425 425  1. For a return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
426 426  
427 427  If we set AT+SEARCH1=1,1E 56 34.      (max 5 bytes for prefix)
428 428  
429 -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**
388 +The valid data will be all bytes after 1E 56 34 , so it is 2e 30 58 5f 36 41 30 31 00 49
430 430  
431 -[[image:1653271044481-711.png]]
390 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image013.png]]
432 432  
392 +
433 433  1. For a return string from AT+COMMAND1:  16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
434 434  
435 435  If we set AT+SEARCH1=2, 1E 56 34+31 00 49
436 436  
437 -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**
397 +Device will search the bytes between 1E 56 34 and 31 00 49. So it is 2e 30 58 5f 36 41 30
438 438  
439 -[[image:1653271276735-972.png]]
399 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image014.png]]
440 440  
401 +
441 441  **AT+DATACUTx : **This command defines how to handle the return from AT+COMMANDx, max return length is 45 bytes.
442 442  
443 -(% style="background-color:#4f81bd; color:white; width:729px" %)
444 -|(% style="width:726px" %)(((
404 +|(((
445 445  **AT+DATACUTx=a,b,c**
446 446  
447 447  * **a: length for the return of AT+COMMAND**
... ... @@ -453,123 +453,85 @@
453 453  
454 454  * Grab bytes:
455 455  
456 -[[image:1653271581490-837.png||height="313" width="722"]]
416 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image015.png]]
457 457  
458 458  * Grab a section.
459 459  
460 -[[image:1653271648378-342.png||height="326" width="720"]]
420 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image016.png]]
461 461  
462 462  * Grab different sections.
463 463  
464 -[[image:1653271657255-576.png||height="305" width="730"]]
424 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image017.png]]
465 465  
466 -(((
467 -(% style="color:red" %)**Note:**
468 -)))
469 469  
470 -(((
427 +Note:
428 +
471 471  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.
472 -)))
473 473  
474 -(((
475 -**Example:**
476 -)))
431 +Example:
477 477  
478 -(((
479 -(% style="color:red" %)AT+COMMAND1=11 01 1E D0,0
480 -)))
433 +AT+COMMAND1=11 01 1E D0,0
481 481  
482 -(((
483 -(% style="color:red" %)AT+SEARCH1=1,1E 56 34
484 -)))
435 +AT+SEARCH1=1,1E 56 34
485 485  
486 -(((
487 -(% style="color:red" %)AT+DATACUT1=0,2,1~~5
488 -)))
437 +AT+DATACUT1=0,2,1~~5
489 489  
490 -(((
491 -(% style="color:red" %)Return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
492 -)))
439 +Return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
493 493  
494 -(((
495 -(% style="color:red" %)String after SEARCH command: 2e 30 58 5f 36 41 30 31 00 49
496 -)))
441 +String after SEARCH command: 2e 30 58 5f 36 41 30 31 00 49
497 497  
498 -(((
499 -(% style="color:red" %)Valid payload after DataCUT command: 2e 30 58 5f 36
500 -)))
443 +Valid payload after DataCUT command: 2e 30 58 5f 36
501 501  
502 -[[image:1653271763403-806.png]]
445 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image018.png]]
503 503  
504 -=== 3.3.4 Compose the uplink payload ===
505 505  
506 -(((
448 +
449 +
450 +1.
451 +11.
452 +111. Compose the uplink payload
453 +
507 507  Through AT+COMMANDx and AT+DATACUTx we got valid value from each RS485 commands, Assume these valid value are RETURN1, RETURN2, .., to RETURNx. The next step is how to compose the LoRa Uplink Payload by these RETURNs. The command is **AT+DATAUP.**
508 -)))
509 509  
510 -(((
511 -(% style="color:#4f81bd" %)**Examples: AT+DATAUP=0**
512 -)))
513 513  
514 -(((
515 -Compose the uplink payload with value returns in sequence and send with (% style="color:red" %)**A SIGNLE UPLINK**.
516 -)))
457 +**Examples: AT+DATAUP=0**
517 517  
518 -(((
459 +Compose the uplink payload with value returns in sequence and send with **A SIGNLE UPLINK**.
460 +
519 519  Final Payload is
520 -)))
521 521  
522 -(((
523 -(% style="color:#4f81bd" %)Battery Info+PAYVER + VALID Value from RETURN1 + Valid Value from RETURN2 + … + RETURNx
524 -)))
463 +Battery Info+PAYVER + VALID Value from RETURN1 + Valid Value from RETURN2 + … + RETURNx
525 525  
526 -(((
527 527  Where PAYVER is defined by AT+PAYVER, below is an example screen shot.
528 -)))
529 529  
530 -[[image:1653272787040-634.png||height="515" width="719"]]
467 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image019.png]]
531 531  
532 -(((
533 -(% style="color:#4f81bd" %)**Examples: AT+DATAUP=1**
534 -)))
535 535  
536 -(((
537 -Compose the uplink payload with value returns in sequence and send with (% style="color:red" %)**Multiply UPLINKs**.
538 -)))
539 539  
540 -(((
471 +**Examples: AT+DATAUP=1**
472 +
473 +Compose the uplink payload with value returns in sequence and send with **Multiply UPLINKs**.
474 +
541 541  Final Payload is
542 -)))
543 543  
544 -(((
545 -(% style="color:#4f81bd" %)Battery Info+PAYVER + PAYLOAD COUNT + PAYLOAD# + DATA
546 -)))
477 +Battery Info+PAYVER + PAYLOAD COUNT + PAYLOAD# + DATA
547 547  
548 -1. (((
549 -Battery Info (2 bytes): Battery voltage
550 -)))
551 -1. (((
552 -PAYVER (1 byte): Defined by AT+PAYVER
553 -)))
554 -1. (((
555 -PAYLOAD COUNT (1 byte): Total how many uplinks of this sampling.
556 -)))
557 -1. (((
558 -PAYLOAD# (1 byte): Number of this uplink. (from 0,1,2,3…,to PAYLOAD COUNT)
559 -)))
560 -1. (((
561 -DATA: Valid value: max 6 bytes(US915 version here, Notice*!) for each uplink so each uplink <= 11 bytes. For the last uplink, DATA will might less than 6 bytes
562 -)))
479 +1. Battery Info (2 bytes): Battery voltage
480 +1. PAYVER (1 byte): Defined by AT+PAYVER
481 +1. PAYLOAD COUNT (1 byte): Total how many uplinks of this sampling.
482 +1. PAYLOAD# (1 byte): Number of this uplink. (from 0,1,2,3…,to PAYLOAD COUNT)
483 +1. DATA: Valid value: max 6 bytes(US915 version here, [[Notice*!>>path:#max_byte]]) for each uplink so each uplink <= 11 bytes. For the last uplink, DATA will might less than 6 bytes
563 563  
564 -[[image:1653272817147-600.png||height="437" width="717"]]
485 +[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image020.png]]
565 565  
487 +
566 566  So totally there will be 3 uplinks for this sampling, each uplink includes 6 bytes DATA
567 567  
568 -DATA1=RETURN1 Valid Value = ~(% style="background-color:#4f81bd;color:white" %)(% style="display:none" %) (%%)20 20 0a 33 90 41
490 +DATA1=RETURN1 Valid Value = 20 20 0a 33 90 41
569 569  
570 -DATA2=1^^st^^ ~~ 6^^th^^ byte of Valid value of RETURN10= ~(% style="background-color:#4f81bd;color:white" %)(% style="display:none" %) (%%)02 aa 05 81 0a 20
492 +DATA2=1^^st^^ ~~ 6^^th^^ byte of Valid value of RETURN10= 02 aa 05 81 0a 20
571 571  
572 -DATA3=7^^th^^ ~~ 11^^th^^ bytes of Valid value of RETURN10 =~(% style="background-color:#4f81bd;color:white" %)(% style="display:none" %) (%%) 20 20 20 2d 30
494 +DATA3=7^^th^^ ~~ 11^^th^^ bytes of Valid value of RETURN10 = 20 20 20 2d 30
573 573  
574 574  
575 575  
... ... @@ -590,8 +590,8 @@
590 590  
591 591  
592 592  
593 -1.
594 -11.
515 +1.
516 +11.
595 595  111. Uplink on demand
596 596  
597 597  Except uplink periodically, RS485-BL is able to uplink on demand. The server sends downlink command to RS485-BL and RS485 will uplink data base on the command.
... ... @@ -604,8 +604,8 @@
604 604  
605 605  
606 606  
607 -1.
608 -11.
529 +1.
530 +11.
609 609  111. Uplink on Interrupt
610 610  
611 611  Put the interrupt sensor between 3.3v_out and GPIO ext.[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image022.png]]
... ... @@ -619,7 +619,7 @@
619 619  AT+INTMOD=3  Interrupt trigger by rising edge.
620 620  
621 621  
622 -1.
544 +1.
623 623  11. Uplink Payload
624 624  
625 625  |**Size(bytes)**|**2**|**1**|**Length depends on the return from the commands**
... ... @@ -681,15 +681,15 @@
681 681  
682 682  * **Sensor Related Commands**: These commands are special designed for RS485-BL.  User can see these commands below:
683 683  
684 -1.
685 -11.
606 +1.
607 +11.
686 686  111. Common Commands:
687 687  
688 688  They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.3, user can find what common commands it supports: [[http:~~/~~/wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands>>url:http://wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands]]
689 689  
690 690  
691 -1.
692 -11.
613 +1.
614 +11.
693 693  111. Sensor related commands:
694 694  
695 695  ==== Choose Device Type (RS485 or TTL) ====
... ... @@ -995,13 +995,13 @@
995 995  
996 996  
997 997  
998 -1.
920 +1.
999 999  11. Buttons
1000 1000  
1001 1001  |**Button**|**Feature**
1002 1002  |**RST**|Reboot RS485-BL
1003 1003  
1004 -1.
926 +1.
1005 1005  11. +3V3 Output
1006 1006  
1007 1007  RS485-BL has a Controllable +3V3 output, user can use this output to power external sensor.
... ... @@ -1019,7 +1019,7 @@
1019 1019  By default, the AT+3V3T=0. This is a special case, means the +3V3 output is always on at any time
1020 1020  
1021 1021  
1022 -1.
944 +1.
1023 1023  11. +5V Output
1024 1024  
1025 1025  RS485-BL has a Controllable +5V output, user can use this output to power external sensor.
... ... @@ -1039,13 +1039,13 @@
1039 1039  
1040 1040  
1041 1041  
1042 -1.
964 +1.
1043 1043  11. LEDs
1044 1044  
1045 1045  |**LEDs**|**Feature**
1046 1046  |**LED1**|Blink when device transmit a packet.
1047 1047  
1048 -1.
970 +1.
1049 1049  11. Switch Jumper
1050 1050  
1051 1051  |**Switch Jumper**|**Feature**
... ... @@ -1091,7 +1091,7 @@
1091 1091  
1092 1092  
1093 1093  
1094 -1.
1016 +1.
1095 1095  11. Common AT Command Sequence
1096 1096  111. Multi-channel ABP mode (Use with SX1301/LG308)
1097 1097  
... ... @@ -1110,8 +1110,8 @@
1110 1110  
1111 1111  ATZ
1112 1112  
1113 -1.
1114 -11.
1035 +1.
1036 +11.
1115 1115  111. Single-channel ABP mode (Use with LG01/LG02)
1116 1116  
1117 1117  AT+FDR   Reset Parameters to Factory Default, Keys Reserve
... ... @@ -1186,7 +1186,7 @@
1186 1186  [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image035.png]] [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image036.png]]
1187 1187  
1188 1188  
1189 -1.
1111 +1.
1190 1190  11. How to change the LoRa Frequency Bands/Region?
1191 1191  
1192 1192  User can follow the introduction for [[how to upgrade image>>path:#upgrade_image]]. When download the images, choose the required image file for download.
... ... @@ -1193,7 +1193,7 @@
1193 1193  
1194 1194  
1195 1195  
1196 -1.
1118 +1.
1197 1197  11. How many RS485-Slave can RS485-BL connects?
1198 1198  
1199 1199  The RS485-BL can support max 32 RS485 devices. Each uplink command of RS485-BL can support max 16 different RS485 command. So RS485-BL can support max 16 RS485 devices pre-program in the device for uplink. For other devices no pre-program, user can use the [[downlink message (type code 0xA8) to poll their info>>path:#downlink_A8]].
... ... @@ -1210,7 +1210,7 @@
1210 1210  
1211 1211  
1212 1212  
1213 -1.
1135 +1.
1214 1214  11. Why I can’t join TTN V3 in US915 /AU915 bands?
1215 1215  
1216 1216  It might about the channels mapping. Please see for detail.
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