Last modified by Karry Zhuang on 2025/03/06 16:34
<
From version < 32.7 >
edited by Xiaoling
on 2022/06/02 15:25
To version < 35.2 >
edited by Xiaoling
on 2022/06/02 15:44
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... ... @@ -100,10 +100,13 @@
100 100  * Smart Cities
101 101  * Smart Factory
102 102  
103 +
104 +
103 103  == 1.5 Firmware Change log ==
104 104  
105 105  [[RS485-LN Image files – Download link and Change log>>url:http://www.dragino.com/downloads/index.php?dir=RS485-LN/]]
106 106  
109 +
107 107  == 1.6 Hardware Change log ==
108 108  
109 109  (((
... ... @@ -111,6 +111,8 @@
111 111  v1.2: Add External Interrupt Pin.
112 112  
113 113  v1.0: Release
117 +
118 +
114 114  )))
115 115  )))
116 116  
... ... @@ -127,6 +127,8 @@
127 127  )))
128 128  
129 129  [[image:1653268091319-405.png]]
135 +
136 +
130 130  )))
131 131  
132 132  = 3. Operation Mode =
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135 135  
136 136  (((
137 137  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 +
138 138  )))
139 139  
140 140  == 3.2 Example to join LoRaWAN network ==
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143 143  
144 144  [[image:1653268155545-638.png||height="334" width="724"]]
145 145  
155 +
146 146  (((
157 +(((
147 147  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 +)))
148 148  
161 +(((
149 149  485A+ and 485B- of the sensor are connected to RS485A and RA485B of RS485-LN respectively.
163 +)))
150 150  
151 151  [[image:1653268227651-549.png||height="592" width="720"]]
152 152  
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198 198  
199 199  [[image:1652953568895-172.png||height="232" width="724"]]
200 200  
215 +
201 201  == 3.3 Configure Commands to read data ==
202 202  
203 203  (((
... ... @@ -207,6 +207,8 @@
207 207  
208 208  (((
209 209  (% 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 +
210 210  )))
211 211  )))
212 212  
... ... @@ -214,19 +214,19 @@
214 214  
215 215  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:
216 216  
217 -(% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
218 -|(((
234 +(% border="1" style="background-color:#ffffcc; color:green; width:782px" %)
235 +|(% style="width:128px" %)(((
219 219  **AT Commands**
220 -)))|(% style="width:285px" %)(((
237 +)))|(% style="width:305px" %)(((
221 221  **Description**
222 -)))|(% style="width:347px" %)(((
239 +)))|(% style="width:346px" %)(((
223 223  **Example**
224 224  )))
225 -|(((
242 +|(% style="width:128px" %)(((
226 226  AT+BAUDR
227 -)))|(% style="width:285px" %)(((
244 +)))|(% style="width:305px" %)(((
228 228  Set the baud rate (for RS485 connection). Default Value is: 9600.
229 -)))|(% style="width:347px" %)(((
246 +)))|(% style="width:346px" %)(((
230 230  (((
231 231  AT+BAUDR=9600
232 232  )))
... ... @@ -235,11 +235,11 @@
235 235  Options: (1200,2400,4800,14400,19200,115200)
236 236  )))
237 237  )))
238 -|(((
255 +|(% style="width:128px" %)(((
239 239  AT+PARITY
240 -)))|(% style="width:285px" %)(((
257 +)))|(% style="width:305px" %)(((
241 241  Set UART parity (for RS485 connection)
242 -)))|(% style="width:347px" %)(((
259 +)))|(% style="width:346px" %)(((
243 243  (((
244 244  AT+PARITY=0
245 245  )))
... ... @@ -248,9 +248,9 @@
248 248  Option: 0: no parity, 1: odd parity, 2: even parity
249 249  )))
250 250  )))
251 -|(((
268 +|(% style="width:128px" %)(((
252 252  AT+STOPBIT
253 -)))|(% style="width:285px" %)(((
270 +)))|(% style="width:305px" %)(((
254 254  (((
255 255  Set serial stopbit (for RS485 connection)
256 256  )))
... ... @@ -258,7 +258,7 @@
258 258  (((
259 259  
260 260  )))
261 -)))|(% style="width:347px" %)(((
278 +)))|(% style="width:346px" %)(((
262 262  (((
263 263  AT+STOPBIT=0 for 1bit
264 264  )))
... ... @@ -272,6 +272,8 @@
272 272  )))
273 273  )))
274 274  
292 +
293 +
275 275  === 3.3.2 Configure sensors ===
276 276  
277 277  (((
... ... @@ -290,80 +290,41 @@
290 290  mm: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
291 291  )))|(% style="width:256px" %)AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
292 292  
293 -=== 3.3.3 Configure read commands for each sampling ===
294 294  
295 -(((
296 -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.
297 -)))
298 298  
299 -(((
300 -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.
301 -)))
314 +=== 3.3.3 Configure read commands for each sampling ===
302 302  
303 303  (((
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 +
304 304  To save the LoRaWAN network bandwidth, we might need to read data from different sensors and combine their valid value into a short payload.
305 -)))
306 306  
307 -(((
308 308  This section describes how to achieve above goals.
309 -)))
310 310  
311 -(((
312 -During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
313 -)))
323 +During each sampling, the RS485-LN can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
314 314  
315 -(((
316 -**Command from RS485-BL to Sensor:**
317 -)))
318 318  
319 -(((
320 -RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
321 -)))
326 +**Each RS485 commands include two parts:**
322 322  
323 -(((
324 -**Handle return from sensors to RS485-BL**:
325 -)))
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.
326 326  
327 -(((
328 -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**
329 -)))
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.
330 330  
331 -* (((
332 -**AT+DATACUT**
333 -)))
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
334 334  
335 -(((
336 -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.
337 -)))
334 +**AT+CMDDL1=1000** to send the open time to 1000ms
338 338  
339 -* (((
340 -**AT+SEARCH**
341 -)))
342 342  
343 -(((
344 -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.
345 -)))
346 -
347 -(((
348 -**Define wait timeout:**
349 -)))
350 -
351 -(((
352 -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
353 -)))
354 -
355 -(((
356 356  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
357 -)))
358 358  
359 -**Examples:**
360 360  
361 361  Below are examples for the how above AT Commands works.
362 362  
363 -**AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
364 364  
365 -(% border="1" class="table-bordered" %)
366 -|(((
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" %)(((
367 367  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
368 368  
369 369  **xx xx xx xx xx xx xx xx xx xx xx xx: The RS485 command to be sent**
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371 371  **m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command**
372 372  )))
373 373  
374 -(((
375 375  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.
376 -)))
377 377  
378 -(((
379 -In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
380 -)))
356 +In the RS485-LN, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
381 381  
382 -(((
383 -**AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
384 -)))
385 385  
386 -(% border="1" class="table-bordered" %)
387 -|(((
388 -**AT+SEARCHx=aa,xx xx xx xx xx**
389 -
390 -* **aa: 1: prefix match mode; 2: prefix and suffix match mode**
391 -* **xx xx xx xx xx: match string. Max 5 bytes for prefix and 5 bytes for suffix**
392 -
393 -
394 -)))
395 -
396 -**Examples:**
397 -
398 -~1. For a return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
399 -
400 -If we set AT+SEARCH1=1,1E 56 34.      (max 5 bytes for prefix)
401 -
402 -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**
403 -
404 -[[image:1653269403619-508.png]]
405 -
406 -2. For a return string from AT+COMMAND1:  16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
407 -
408 -If we set AT+SEARCH1=2, 1E 56 34+31 00 49
409 -
410 -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**
411 -
412 -[[image:1653269438444-278.png]]
413 -
414 414  **AT+DATACUTx : **This command defines how to handle the return from AT+COMMANDx, max return length is 45 bytes.
415 415  
416 -|(((
361 +(% border="1" style="background-color:#4bacc6; color:white; width:725px" %)
362 +|(% style="width:722px" %)(((
417 417  **AT+DATACUTx=a,b,c**
418 418  
419 419  * **a: length for the return of AT+COMMAND**
420 420  * **b:1: grab valid value by byte, max 6 bytes. 2: grab valid value by bytes section, max 3 sections.**
421 -* **c: define the position for valid value.  **
367 +* **c: define the position for valid value. **
422 422  )))
423 423  
424 -Examples:
425 425  
371 +**Examples:**
372 +
426 426  * Grab bytes:
427 427  
428 -[[image:1653269551753-223.png||height="311" width="717"]]
375 +[[image:image-20220602153621-1.png]]
429 429  
377 +
430 430  * Grab a section.
431 431  
432 -[[image:1653269568276-930.png||height="325" width="718"]]
380 +[[image:image-20220602153621-2.png]]
433 433  
382 +
434 434  * Grab different sections.
435 435  
436 -[[image:1653269593172-426.png||height="303" width="725"]]
385 +[[image:image-20220602153621-3.png]]
386 +)))
437 437  
438 -(% style="color:red" %)**Note:**
439 -
440 -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.
441 -
442 -Example:
443 -
444 -(% style="color:red" %)AT+COMMAND1=11 01 1E D0,0
445 -
446 -(% style="color:red" %)AT+SEARCH1=1,1E 56 34
447 -
448 -(% style="color:red" %)AT+DATACUT1=0,2,1~~5
449 -
450 -(% style="color:red" %)Return string from AT+COMMAND1: 16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
451 -
452 -(% style="color:red" %)String after SEARCH command: 2e 30 58 5f 36 41 30 31 00 49
453 -
454 -(% style="color:red" %)Valid payload after DataCUT command: 2e 30 58 5f 36
455 -
456 -[[image:1653269618463-608.png]]
457 -
458 458  === 3.3.4 Compose the uplink payload ===
459 459  
460 460  (((
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