Last modified by Karry Zhuang on 2025/03/06 16:34
<
From version < 29.1 >
edited by Xiaoling
on 2022/05/23 09:35
To version < 38.3 >
edited by Xiaoling
on 2022/06/02 16:10
>
Change comment: There is no comment for this version

Summary

Details

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Content
... ... @@ -18,26 +18,30 @@
18 18  
19 19  (((
20 20  (((
21 -The Dragino RS485-LN is a RS485 to LoRaWAN Converter. It converts the RS485 signal into LoRaWAN wireless signal which simplify the IoT installation and reduce the installation/maintaining cost.
21 +The Dragino RS485-LN is a (% style="color:blue" %)**RS485 to LoRaWAN Converter**(%%). It converts the RS485 signal into LoRaWAN wireless signal which simplify the IoT installation and reduce the installation/maintaining cost.
22 22  )))
23 23  
24 24  (((
25 -RS485-LN allows user to monitor / control RS485 devices and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
25 +RS485-LN allows user to (% style="color:blue" %)**monitor / control RS485 devices**(%%) and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
26 26  )))
27 27  
28 28  (((
29 -For data uplink, RS485-LN sends user-defined commands to RS485 devices and gets the return from the RS485 devices. RS485-LN will process these returns according to user-define rules to get the final payload and upload to LoRaWAN server.
29 +(% style="color:blue" %)**For data uplink**(%%), RS485-LN sends user-defined commands to RS485 devices and gets the return from the RS485 devices. RS485-LN will process these returns according to user-define rules to get the final payload and upload to LoRaWAN server.
30 30  )))
31 31  
32 32  (((
33 -For data downlink, RS485-LN runs in LoRaWAN Class C. When there downlink commands from LoRaWAN server, RS485-LN will forward the commands from LoRaWAN server to RS485 devices.
33 +(% style="color:blue" %)**For data downlink**(%%), RS485-LN runs in LoRaWAN Class C. When there downlink commands from LoRaWAN server, RS485-LN will forward the commands from LoRaWAN server to RS485 devices.
34 +
35 +(% style="color:blue" %)**Demo Dashboard for RS485-LN**(%%) connect to two energy meters: [[https:~~/~~/app.datacake.de/dashboard/d/58844a26-378d-4c5a-aaf5-b5b5b153447a>>url:https://app.datacake.de/dashboard/d/58844a26-378d-4c5a-aaf5-b5b5b153447a]]
34 34  )))
35 35  )))
36 36  
37 37  [[image:1653267211009-519.png||height="419" width="724"]]
38 38  
41 +
39 39  == 1.2 Specifications ==
40 40  
44 +
41 41  **Hardware System:**
42 42  
43 43  * STM32L072CZT6 MCU
... ... @@ -44,8 +44,6 @@
44 44  * SX1276/78 Wireless Chip 
45 45  * Power Consumption (exclude RS485 device):
46 46  ** Idle: 32mA@12v
47 -
48 -*
49 49  ** 20dB Transmit: 65mA@12v
50 50  
51 51  **Interface for Model:**
... ... @@ -98,6 +98,7 @@
98 98  
99 99  [[RS485-LN Image files – Download link and Change log>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/]]
100 100  
103 +
101 101  == 1.6 Hardware Change log ==
102 102  
103 103  (((
... ... @@ -105,6 +105,8 @@
105 105  v1.2: Add External Interrupt Pin.
106 106  
107 107  v1.0: Release
111 +
112 +
108 108  )))
109 109  )))
110 110  
... ... @@ -121,6 +121,8 @@
121 121  )))
122 122  
123 123  [[image:1653268091319-405.png]]
129 +
130 +
124 124  )))
125 125  
126 126  = 3. Operation Mode =
... ... @@ -129,6 +129,8 @@
129 129  
130 130  (((
131 131  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.
139 +
140 +
132 132  )))
133 133  
134 134  == 3.2 Example to join LoRaWAN network ==
... ... @@ -137,10 +137,15 @@
137 137  
138 138  [[image:1653268155545-638.png||height="334" width="724"]]
139 139  
149 +
140 140  (((
151 +(((
141 141  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:
153 +)))
142 142  
155 +(((
143 143  485A+ and 485B- of the sensor are connected to RS485A and RA485B of RS485-LN respectively.
157 +)))
144 144  
145 145  [[image:1653268227651-549.png||height="592" width="720"]]
146 146  
... ... @@ -192,6 +192,7 @@
192 192  
193 193  [[image:1652953568895-172.png||height="232" width="724"]]
194 194  
209 +
195 195  == 3.3 Configure Commands to read data ==
196 196  
197 197  (((
... ... @@ -201,6 +201,8 @@
201 201  
202 202  (((
203 203  (% 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
219 +
220 +
204 204  )))
205 205  )))
206 206  
... ... @@ -208,19 +208,19 @@
208 208  
209 209  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:
210 210  
211 -(% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
212 -|(((
228 +(% border="1" style="background-color:#ffffcc; color:green; width:782px" %)
229 +|(% style="width:128px" %)(((
213 213  **AT Commands**
214 -)))|(% style="width:285px" %)(((
231 +)))|(% style="width:305px" %)(((
215 215  **Description**
216 -)))|(% style="width:347px" %)(((
233 +)))|(% style="width:346px" %)(((
217 217  **Example**
218 218  )))
219 -|(((
236 +|(% style="width:128px" %)(((
220 220  AT+BAUDR
221 -)))|(% style="width:285px" %)(((
238 +)))|(% style="width:305px" %)(((
222 222  Set the baud rate (for RS485 connection). Default Value is: 9600.
223 -)))|(% style="width:347px" %)(((
240 +)))|(% style="width:346px" %)(((
224 224  (((
225 225  AT+BAUDR=9600
226 226  )))
... ... @@ -229,11 +229,11 @@
229 229  Options: (1200,2400,4800,14400,19200,115200)
230 230  )))
231 231  )))
232 -|(((
249 +|(% style="width:128px" %)(((
233 233  AT+PARITY
234 -)))|(% style="width:285px" %)(((
251 +)))|(% style="width:305px" %)(((
235 235  Set UART parity (for RS485 connection)
236 -)))|(% style="width:347px" %)(((
253 +)))|(% style="width:346px" %)(((
237 237  (((
238 238  AT+PARITY=0
239 239  )))
... ... @@ -242,9 +242,9 @@
242 242  Option: 0: no parity, 1: odd parity, 2: even parity
243 243  )))
244 244  )))
245 -|(((
262 +|(% style="width:128px" %)(((
246 246  AT+STOPBIT
247 -)))|(% style="width:285px" %)(((
264 +)))|(% style="width:305px" %)(((
248 248  (((
249 249  Set serial stopbit (for RS485 connection)
250 250  )))
... ... @@ -252,7 +252,7 @@
252 252  (((
253 253  
254 254  )))
255 -)))|(% style="width:347px" %)(((
272 +)))|(% style="width:346px" %)(((
256 256  (((
257 257  AT+STOPBIT=0 for 1bit
258 258  )))
... ... @@ -287,77 +287,34 @@
287 287  === 3.3.3 Configure read commands for each sampling ===
288 288  
289 289  (((
290 -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.
291 -)))
307 +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.
292 292  
293 -(((
294 -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.
295 -)))
296 -
297 -(((
298 298  To save the LoRaWAN network bandwidth, we might need to read data from different sensors and combine their valid value into a short payload.
299 -)))
300 300  
301 -(((
302 302  This section describes how to achieve above goals.
303 -)))
304 304  
305 -(((
306 -During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
307 -)))
313 +During each sampling, the RS485-LN can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
308 308  
309 -(((
310 -**Command from RS485-BL to Sensor:**
311 -)))
312 312  
313 -(((
314 -RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
315 -)))
316 +**Each RS485 commands include two parts:**
316 316  
317 -(((
318 -**Handle return from sensors to RS485-BL**:
319 -)))
318 +~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.
320 320  
321 -(((
322 -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**
323 -)))
320 +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.
324 324  
325 -* (((
326 -**AT+DATACUT**
327 -)))
322 +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 **AT+CMDDL1=1000** to send the open time to 1000ms
328 328  
329 -(((
330 -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.
331 -)))
332 332  
333 -* (((
334 -**AT+SEARCH**
335 -)))
336 -
337 -(((
338 -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.
339 -)))
340 -
341 -(((
342 -**Define wait timeout:**
343 -)))
344 -
345 -(((
346 -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
347 -)))
348 -
349 -(((
350 350  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
351 -)))
352 352  
353 -**Examples:**
354 354  
355 355  Below are examples for the how above AT Commands works.
356 356  
357 -**AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
358 358  
359 -(% border="1" class="table-bordered" %)
360 -|(((
331 +**AT+COMMANDx : **This command will be sent to RS485 devices during each sampling, Max command length is 14 bytes. The grammar is:
332 +
333 +(% border="1" style="background-color:#4bacc6; color:white; width:499px" %)
334 +|(% style="width:496px" %)(((
361 361  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
362 362  
363 363  **xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent**
... ... @@ -367,43 +367,13 @@
367 367  
368 368  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.
369 369  
370 -In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
344 +In the RS485-LN, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
371 371  
372 -**AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
373 373  
374 -(% border="1" class="table-bordered" %)
375 -|(((
376 -**AT+SEARCHx=aa,xx xx xx xx xx**
377 -
378 -* **aa: 1: prefix match mode; 2: prefix and suffix match mode**
379 -* **xx xx xx xx xx: match string. Max 5 bytes for prefix and 5 bytes for suffix**
380 -
381 -
382 -)))
383 -
384 -Examples:
385 -
386 -1. For a return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
387 -
388 -If we set AT+SEARCH1=1,1E 56 34.      (max 5 bytes for prefix)
389 -
390 -The valid data will be all bytes after 1E 56 34 , so it is 2e 30 58 5f 36 41 30 31 00 49
391 -
392 -[[image:1652954654347-831.png]]
393 -
394 -
395 -1. For a return string from AT+COMMAND1:  16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
396 -
397 -If we set AT+SEARCH1=2, 1E 56 34+31 00 49
398 -
399 -Device will search the bytes between 1E 56 34 and 31 00 49. So it is 2e 30 58 5f 36 41 30
400 -
401 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image014.png]]
402 -
403 -
404 404  **AT+DATACUTx : **This command defines how to handle the return from AT+COMMANDx, max return length is 45 bytes.
405 405  
406 -|(((
349 +(% border="1" style="background-color:#4bacc6; color:white; width:725px" %)
350 +|(% style="width:722px" %)(((
407 407  **AT+DATACUTx=a,b,c**
408 408  
409 409  * **a: length for the return of AT+COMMAND**
... ... @@ -411,138 +411,121 @@
411 411  * **c: define the position for valid value.  **
412 412  )))
413 413  
414 -Examples:
358 +**Examples:**
415 415  
416 416  * Grab bytes:
417 417  
418 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image015.png]]
362 +[[image:image-20220602153621-1.png]]
419 419  
364 +
420 420  * Grab a section.
421 421  
422 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image016.png]]
367 +[[image:image-20220602153621-2.png]]
423 423  
369 +
424 424  * Grab different sections.
425 425  
426 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image017.png]]
372 +[[image:image-20220602153621-3.png]]
427 427  
374 +
375 +)))
428 428  
429 -Note:
377 +=== 3.3.4 Compose the uplink payload ===
430 430  
431 -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.
432 -
433 -Example:
434 -
435 -AT+COMMAND1=11 01 1E D0,0
436 -
437 -AT+SEARCH1=1,1E 56 34
438 -
439 -AT+DATACUT1=0,2,1~~5
440 -
441 -Return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
442 -
443 -String after SEARCH command: 2e 30 58 5f 36 41 30 31 00 49
444 -
445 -Valid payload after DataCUT command: 2e 30 58 5f 36
446 -
447 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image018.png]]
448 -
449 -
450 -
451 -
452 -1.
453 -11.
454 -111. Compose the uplink payload
455 -
379 +(((
456 456  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.**
457 457  
382 +
383 +)))
458 458  
459 -**Examples: AT+DATAUP=0**
385 +(((
386 +(% style="color:#037691" %)**Examples: AT+DATAUP=0**
460 460  
461 -Compose the uplink payload with value returns in sequence and send with **A SIGNLE UPLINK**.
388 +
389 +)))
462 462  
391 +(((
392 +Compose the uplink payload with value returns in sequence and send with (% style="color:red" %)**A SIGNLE UPLINK**.
393 +)))
394 +
395 +(((
463 463  Final Payload is
397 +)))
464 464  
465 -Battery Info+PAYVER + VALID Value from RETURN1 + Valid Value from RETURN2 + … + RETURNx
399 +(((
400 +(% style="color:#4f81bd" %)**Battery Info+PAYVER + VALID Value from RETURN1 + Valid Value from RETURN2 + … + RETURNx**
401 +)))
466 466  
403 +(((
467 467  Where PAYVER is defined by AT+PAYVER, below is an example screen shot.
405 +)))
468 468  
469 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image019.png]]
407 +[[image:1653269759169-150.png||height="513" width="716"]]
470 470  
471 471  
410 +(% style="color:#037691" %)**Examples: AT+DATAUP=1**
472 472  
473 -**Examples: AT+DATAUP=1**
474 474  
475 -Compose the uplink payload with value returns in sequence and send with **Multiply UPLINKs**.
413 +Compose the uplink payload with value returns in sequence and send with (% style="color:red" %)**Multiply UPLINKs**.
476 476  
477 477  Final Payload is
478 478  
479 -Battery Info+PAYVER + PAYLOAD COUNT + PAYLOAD# + DATA
417 +(% style="color:#4f81bd" %)**Battery Info+PAYVER + PAYLOAD COUNT + PAYLOAD# + DATA**
480 480  
481 -1. Battery Info (2 bytes): Battery voltage
482 -1. PAYVER (1 byte): Defined by AT+PAYVER
483 -1. PAYLOAD COUNT (1 byte): Total how many uplinks of this sampling.
484 -1. PAYLOAD# (1 byte): Number of this uplink. (from 0,1,2,3…,to PAYLOAD COUNT)
485 -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
419 +1. PAYVER: Defined by AT+PAYVER
420 +1. PAYLOAD COUNT: Total how many uplinks of this sampling.
421 +1. PAYLOAD#: Number of this uplink. (from 0,1,2,3…,to PAYLOAD COUNT)
422 +1. DATA: Valid value: max 8 bytes for each uplink so each uplink <= 11 bytes. For the last uplink, DATA will might less than 8 bytes
486 486  
487 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image020.png]]
424 +[[image:image-20220602155039-4.png]]
488 488  
489 489  
490 -So totally there will be 3 uplinks for this sampling, each uplink includes 6 bytes DATA
427 +So totally there will be 3 uplinks for this sampling, each uplink include 8 bytes DATA
491 491  
492 -DATA1=RETURN1 Valid Value = 20 20 0a 33 90 41
429 +DATA1=RETURN1 Valid Value + the first two of Valid value of RETURN10= **20 20 0a 33 90 41 02 aa**
493 493  
494 -DATA2=1^^st^^ ~~ 6^^th^^ byte of Valid value of RETURN10= 02 aa 05 81 0a 20
431 +DATA2=3^^rd^^ ~~ 10^^th^^ byte of Valid value of RETURN10= **05 81 0a 20 20 20 20 2d**
495 495  
496 -DATA3=7^^th^^ ~~ 11^^th^^ bytes of Valid value of RETURN10 = 20 20 20 2d 30
433 +DATA3=the rest of Valid value of RETURN10= **30**
497 497  
498 498  
436 +(% style="color:red" %)Notice: In firmware v1.3, the Max bytes has been changed according to the max bytes in different Frequency Bands for lowest SF. As below:
499 499  
500 -Below are the uplink payloads:
438 + ~* For AU915/AS923 bands, if UplinkDwell time=0, max 51 bytes for each uplink.
501 501  
502 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image021.png]]
440 + * For AU915/AS923 bands, if UplinkDwell time=0, max 11 bytes for each uplink.
503 503  
442 + * For US915 band, max 11 bytes for each uplink.
504 504  
505 -Notice: the Max bytes is according to the max support bytes in different Frequency Bands for lowest SF. As below:
444 + ~* For all other bands: max 51 bytes for each uplink.
506 506  
507 - ~* For AU915/AS923 bands, if UplinkDwell time=0, max 51 bytes for each uplink ( so 51 -5 = 46 max valid date)
508 508  
509 - * For AU915/AS923 bands, if UplinkDwell time=1, max 11 bytes for each uplink ( so 11 -5 = 6 max valid date).
447 +Below are the uplink payloads:
510 510  
511 - * For US915 band, max 11 bytes for each uplink ( so 11 -5 = 6 max valid date).
449 +[[image:1654157178836-407.png]]
512 512  
513 - ~* For all other bands: max 51 bytes for each uplink  ( so 51 -5 = 46 max valid date).
514 514  
452 +=== 3.3.5 Uplink on demand ===
515 515  
454 +Except uplink periodically, RS485-LN is able to uplink on demand. The server send downlink command to RS485-LN and RS485 will uplink data base on the command.
516 516  
517 -1.
518 -11.
519 -111. Uplink on demand
520 -
521 -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.
522 -
523 523  Downlink control command:
524 524  
525 -[[0x08 command>>path:#downlink_08]]: Poll an uplink with current command set in RS485-BL.
458 +**0x08 command**: Poll an uplink with current command set in RS485-LN.
526 526  
527 -[[0xA8 command>>path:#downlink_A8]]: Send a command to RS485-BL and uplink the output from sensors.
460 +**0xA8 command**: Send a command to RS485-LN and uplink the output from sensors.
528 528  
529 529  
530 530  
531 -1.
532 -11.
533 -111. Uplink on Interrupt
464 +=== 3.3.6 Uplink on Interrupt ===
534 534  
535 -Put the interrupt sensor between 3.3v_out and GPIO ext.[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image022.png]]
466 +RS485-LN support external Interrupt uplink since hardware v1.2 release.
536 536  
537 -AT+INTMOD=0  Disable Interrupt
468 +[[image:1654157342174-798.png]]
538 538  
539 -AT+INTMOD=1  Interrupt trigger by rising or falling edge.
470 +Connect the Interrupt pin to RS485-LN INT port and connect the GND pin to V- port. When there is a high voltage (Max 24v) on INT pin. Device will send an uplink packet.
540 540  
541 -AT+INTMOD=2  Interrupt trigger by falling edge. ( Default Value)
542 542  
543 -AT+INTMOD=3  Interrupt trigger by rising edge.
544 -
545 -
546 546  1.
547 547  11. Uplink Payload
548 548  
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