Last modified by Xiaoye on 2024/09/21 08:44
<
From version < 83.4 >
edited by Xiaoling
on 2022/08/23 10:01
To version < 117.2 >
edited by Xiaoling
on 2022/12/28 16:32
>
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... ... @@ -16,12 +16,11 @@
16 16  
17 17  
18 18  
19 -= **1. Introduction** =
19 += 1. Introduction =
20 20  
21 +== 1.1 What is LPS8v2 ==
21 21  
22 -== **1.1 What is LPS8v2** ==
23 23  
24 -
25 25  (((
26 26  (((
27 27  The LPS8v2 is an (% style="color:green" %)**open-source LoRaWAN Gateway**(%%). It lets you bridge LoRa wireless network to an IP network via (% style="color:green" %)**WiFi , Ethernet or Cellular Network**(%%) (via Optional 4G module). The LoRa wireless allows users to send data and reach extremely long ranges at low data rates.
... ... @@ -44,10 +44,9 @@
44 44  )))
45 45  
46 46  
46 +== 1.2 Specifications ==
47 47  
48 -== **1.2 Specifications** ==
49 49  
50 -
51 51  (% style="color:#037691" %)**Hardware System:**
52 52  
53 53  * CPU: Quad-core Cortex-A7 1.2Ghz
... ... @@ -68,7 +68,7 @@
68 68  
69 69  
70 70  
71 -== **1.3 Features** ==
69 +== 1.3 Features ==
72 72  
73 73  
74 74  * Open Source Debian system
... ... @@ -88,11 +88,11 @@
88 88  
89 89  
90 90  
91 -== **1.4 Block Diagram** ==
89 +== 1.4 Block Diagram ==
92 92  
93 93  
94 94  
95 -== **1.5 LED Indicators** ==
93 +== 1.5 LED Indicators ==
96 96  
97 97  
98 98  LPS8-V2 has totally four LEDs, They are:
... ... @@ -100,35 +100,48 @@
100 100  
101 101  (% style="color:blue" %)//**➢ Power LED**//(%%)//: This RED LED will be solid if the device is properly powered//
102 102  
103 -(% style="color:blue" %)//**➢ LoRa LED**//(%%)//: This RGB LED will blink GREEN when the LoRaWAN module starts or transmit a packet//
101 +(% style="color:blue" %)//**➢ ETH LED**//(%%)//:  This RGB LED will blink GREEN when the ETH port is connecting//
104 104  
105 -(% style="color:blue" %)//**➢ SYS LED**//(%%)//: This RGB LED will show different colors in different states~://
103 +(% style="color:blue" %)//**➢ SYS LED**//(%%)//:  This RGB LED will show different colors in different states~://
106 106  
107 -// ✓ **SOLID BLUE:** The device is alive with a LoRaWAN server connection.//
105 +// ✓ **SOLID GREEN:** The device is alive with a LoRaWAN server connection.//
108 108  
109 -// ✓ **BLINKING BLUE:** a) Device has internet connection but no LoRaWAN Connection. or b) Device is in booting stage, in this stage, it will BLINKING BLUE for several seconds and then with SOLID RED and BLINKING BLUE together//
107 +// ✓ **BLINKING GREEN:** a) Device has internet connection but no LoRaWAN Connection. or b) Device is in booting stage, in this stage, it will BLINKING GREEN for several seconds and then with BLINKING GREEN together//
110 110  
111 111  // ✓** SOLID RED:** Device doesn't have an Internet connection.//
112 112  
113 -(% style="color:blue" %)//**➢ ETH LED**//(%%)//: This LED shows the ETH interface connection status.//
111 +(% style="color:blue" %)//**➢ WIFI LED**//(%%)//: This LED shows the WIFI interface connection status.//
114 114  
115 115  
114 +== 1.6 Button Intruction ==
116 116  
117 -= **2. Quick Start** =
118 118  
117 +LPS8-V2 has a black toggle button, which is:
119 119  
120 -The LPS8-V2 supports network access via Ethernet or Wi-Fi connection and runs without a network.
121 121  
122 -In most cases, the first thing you need to do is make the lps8-v2 accessible to the network.
120 +(% style="color:blue" %)**//➢ //Long press 4-5s  : **(%%)the gateway will reload the Network and Initialize wifi configuration
123 123  
122 + // **LED status: ** ETH LED will BLINKIND BULE Until the reload is finished.//
124 124  
125 125  
126 -== **2.1 Connects to the network and accesses the gateway Web UI** ==
125 +(% style="color:blue" %)//**➢ **//**Long press more than 10s:**(%%)**    **//the gateway will restore the factory settings.//
127 127  
127 + //**LED status: ** ETH LED will SOLID BULE Until the restore is finished.//
128 128  
129 -== **2.1.1 connect the network.** ==
130 130  
130 += 2. Quick Start =
131 131  
132 +
133 +The LPS8-V2 supports network access via Ethernet or Wi-Fi connection and runs without a network.
134 +
135 +In most cases, the first thing you need to do is make the lps8-v2 accessible to the network.
136 +
137 +
138 +== 2.1 Connects to the network and accesses the gateway Web UI ==
139 +
140 +== 2.1.1 connect the network ==
141 +
142 +
132 132  === (% style="color:blue" %)**Method 1**(%%):  Connect via Ethernet with DHCP IP from the router ===
133 133  
134 134  
... ... @@ -150,28 +150,6 @@
150 150  [[image:image-20220622100542-2.png||height="369" width="1256"]]
151 151  
152 152  
153 -(((
154 -The LPS8-V2 has a fall-back IP address on its WAN port. you have to access the gateway Web-UI to configure the WiFi connection via the fallback IP address.
155 -)))
156 -
157 -
158 -
159 -(% style="color:#037691" %)**Steps to connect via fallback IP:**
160 -
161 -~1. Connect PC's Ethernet port to LPS8-V2's WAN port
162 -
163 -2. Configure PC's Ethernet port has  IP: 172.31.255.253 and Netmask: 255.255.255.252
164 -
165 -
166 -[[image:image-20220622101433-4.png]]
167 -
168 -
169 -and then On the PC, use the IP address **http:~/~/172.31.255.254** to access the LPS8-V2 via Web or Console.
170 -
171 -
172 -[[image:image-20220622102210-5.png||height="569" width="1039"]]
173 -
174 -
175 175  Fill in the WiFi information by checking the box and clicking (% style="color:red" %)**Save&Apply**
176 176  
177 177  
... ... @@ -185,16 +185,14 @@
185 185  [[image:image-20220622102847-7.png]]
186 186  
187 187  
188 -[[image:image-20220622102901-8.png||height="513" width="1011"]]
177 +[[image:image-20220622102901-8.png||height="476" width="938"]]
189 189  
190 190  
180 +== 2.2 The LPS8-V2 is registered and connected to The Things Network ==
191 191  
192 -== **2.2 The LPS8-V2 is registered and connected to The Things Network** ==
182 +=== 2.2.1 Select your area frequency ===
193 193  
194 194  
195 -=== **2.2.1 Select your area frequency** ===
196 -
197 -
198 198  (((
199 199  First, you need to set the frequency plan in LPS8-V2 to match the end node we use, so to receive the LoRaWAN packets from the LoRaWAN sensor.
200 200  
... ... @@ -201,17 +201,16 @@
201 201  
202 202  )))
203 203  
204 -[[image:image-20220622103332-9.png]]
191 +[[image:image-20220622103332-9.png||height="485" width="938"]]
205 205  
206 206  
194 +=== 2.2.2 Get the only gateway EUI ===
207 207  
208 -=== **2.2.2 Get the only gateway EUI** ===
209 209  
210 -
211 211  Every LPS8-V2 has a unique gateway id. The ID can be found on LoRaWAN Semtech page:
212 212  
213 213  
214 -[[image:image-20220622103355-10.png]]
200 +[[image:image-20220622103355-10.png||height="698" width="949"]]
215 215  
216 216  
217 217  (% style="color:red" %)**Note: Choose the cluster that corresponds to a specific Gateway server address**
... ... @@ -229,10 +229,9 @@
229 229  [[image:image-20220622103956-12.png]]
230 230  
231 231  
218 +== 2.2.3 Register the gateway to The Things Network ==
232 232  
233 -== **2.2.3 Register the gateway to The Things Network** ==
234 234  
235 -
236 236  **Login to The Things Network**
237 237  
238 238  [[https:~~/~~/console.cloud.thethings.network/>>https://console.cloud.thethings.network/]]
... ... @@ -246,23 +246,21 @@
246 246  **Get it online**
247 247  
248 248  
234 += 3. Web Configure Pages =
249 249  
250 -= **3. Web Configure Pages** =
236 +== 3.1 Home ==
251 251  
252 252  
253 -== **3.1 Home** ==
254 -
255 -
256 256  //Shows the system running status~://
257 257  
241 +[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20All%20Gateway%20models/HP0C/WebHome/image-20220622102901-8.png?rev=1.1||alt="image-20220622102901-8.png" height="476" width="939"]]
258 258  
259 259  
260 -== **3.2 LoRa Settings** ==
244 +== 3.2 LoRa Settings ==
261 261  
246 +=== 3.2.1 LoRa ~-~-> LoRa ===
262 262  
263 -=== **3.2.1 LoRa ~-~-> LoRa** ===
264 264  
265 -
266 266  //This page shows the LoRa Radio Settings. There is a set of default frequency bands according to LoRaWAN protocol, and users can customize the band* as well.//
267 267  
268 268  //Different LPS8v2 hardware versions can support different frequency ranges~://
... ... @@ -279,17 +279,15 @@
279 279  
280 280  
281 281  (((
282 -(% style="color:red" %)//**Note *: See this instruction for how to customize the frequency band: **//(%%)**//__[[How to customized LoRaWAN frequency band - DRAGINO>>url:http://8.211.40.43/xwiki/bin/view/Main/How%20to%20customized%20LoRaWAN%20frequency%20band/]]__//**
265 +(% style="color:red" %)//**Note *: See this instruction for how to customize the frequency band: **//(%%)**//__[[How to customized LoRaWAN frequency band - DRAGINO>>doc:Main.How to customized LoRaWAN frequency band.WebHome]]__//**
283 283  )))
284 284  
285 285  
269 +== 3.3 LoRaWAN Settings ==
286 286  
287 -== **3.3 LoRaWAN Settings** ==
271 +=== 3.3.1 LoRaWAN ~-~-> LoRaWAN Semtech UDP ===
288 288  
289 289  
290 -=== **3.3.1 LoRaWAN ~-~-> LoRaWAN Semtech UDP** ===
291 -
292 -
293 293  //This page is for the connection set up to a general LoRaWAN Network server such as [[TTN>>url:http://www.thethingsnetwork.org/]], [[ChirpStack>>url:https://www.chirpstack.io/]], etc.//
294 294  
295 295  
... ... @@ -296,10 +296,9 @@
296 296  [[image:image-20220616111932-2.png||height="516" width="672"]]
297 297  
298 298  
280 +=== 3.3.2 LoRaWAN ~-~-> LoRaWAN Basic Station ===
299 299  
300 -=== **3.3.2 LoRaWAN ~-~-> LoRaWAN Basic Station** ===
301 301  
302 -
303 303  //This page is for the connection set up to the TTN Basic Station, AWS-IoT, etc.//
304 304  
305 305  
... ... @@ -307,59 +307,53 @@
307 307  
308 308  
309 309  (((
310 -Please see this instruction to know more detail and a demo for how to use of LoRaWAN Basic Station: __[[Use of LoRaWAN Basic Station - DRAGINO>>url:http://8.211.40.43/xwiki/bin/view/Main/Use%20of%20LoRaWAN%20Basic%20Station/]]__
290 +Please see this instruction to know more detail and a demo for how to use of LoRaWAN Basic Station: __[[Use of LoRaWAN Basic Station - DRAGINO>>doc:Main.Use of LoRaWAN Basic Station.WebHome]]__
311 311  )))
312 312  
313 313  
294 +== 3.4 Network Settings ==
314 314  
315 -== **3.4 Network Settings** ==
296 +=== 3.4.1 Network ~-~-> WiFi ===
316 316  
317 317  
318 -=== **3.4.1 Network ~-~-> WiFi** ===
319 -
320 -
321 321  [[image:image-20220616114756-4.png||height="251" width="669"]]
322 322  
323 323  
302 +=== 3.4.2 Network ~-~-> System Status ===
324 324  
325 -=== **3.4.2 Network ~-~-> System Status** ===
326 326  
327 -
328 328  [[image:image-20220820134112-2.png||height="539" width="668"]]
329 329  
330 330  
308 +=== 3.4.3 Network ~-~-> Firewall ===
331 331  
332 -=== **3.4.3 Network ~-~-> Firewall** ===
333 333  
334 -
335 335  [[image:image-20220616115351-6.png||height="244" width="661"]]
336 336  
337 337  
314 +== 3.5 System ==
338 338  
339 -== **3.5 System** ==
316 +=== 3.5.1  System ~-~-> System Overview ===
340 340  
341 341  
342 -=== **3.5.1  System ~-~-> System Overview** ===
343 -
344 -
345 345  Shows the system info:
346 346  
321 +[[image:image-20220917144512-5.png||height="618" width="853"]]
347 347  
348 348  
349 -=== **3.5.2 System ~-~-> Backup/Restore** ===
324 +=== 3.5.2 System ~-~-> Backup/Restore ===
350 350  
351 351  
352 -[[image:image-20220616115808-7.png||height="194" width="649"]]
327 +[[image:image-20220917144725-6.png||height="208" width="869"]]
353 353  
354 354  
330 += 4. Build-in Server =
355 355  
356 -= **4. Build-in Server** =
357 357  
358 -
359 359  The default factory version of LPS8-V2 is installed with the built-in Applicant server: (% style="color:blue" %)**Node-Red, and**(%%) LoRaWAN Server: (% style="color:blue" %)**The Things Network - Stack (Open Source 3.19 Version).**
360 360  
361 361  
362 -[[image:image-20220820115644-1.png]]
336 +[[image:image-20220820115644-1.png||height="217" width="778"]]
363 363  
364 364  
365 365  (% style="color:red" %)**Note:**
... ... @@ -372,17 +372,16 @@
372 372  
373 373  **~ 1. URL does not jump properly**
374 374  
375 - For the ttn-stack, you can click the update the URL which will update the configuration where change the hotsname to the current local IP address as the URL.
349 + For the ttn-stack, you can click the update the URL which will update the configuration where change the hostname to the current local IP address as the URL.
376 376  
377 - For the Node-Red, you can use the local IP address and the port is 18880 to access it.
351 + For the Node-Red, you can use the local IP address and the port is 1880 to access it.
378 378  
379 379  
354 +== 4.1 LoRaWAN Network  Server ~-~- The Things Network - Stack (TTN-V3) ==
380 380  
381 -== **4.1 LoRaWAN Network  Server ~-~- The Things Network - Stack (TTN-V3)** ==
382 382  
357 +You can access the gateway's built-in LNS server of (% style="color:blue" %)**The Things Network - Stack **(%%)via the URL( (% style="background-color:yellow" %)__**//http:~/~/<hostname>:8080 or http:~/~/<local-IPV4-address> //**__(%%)) in your browser.
383 383  
384 -You can access the gateway's built-in LNS server of **The Things Network - Stack **via the URL( (% style="background-color:yellow" %)__**//http:~/~/<hostname>:8080 or http:~/~/<local-IPV4-address> //**__(%%)) in your browser.
385 -
386 386  Such as  (% style="background-color:yellow" %)__**//http:~/~/dragino-54ff12:8080  or http:~/~/<Local-IPV4-Address>//**__
387 387  
388 388  
... ... @@ -396,34 +396,44 @@
396 396  [[image:image-20220725171719-1.png||height="570" width="769"]]
397 397  
398 398  
372 +== 4.2 Application Server ~-~- Node-Red ==
399 399  
400 -== **4.2. Application Server ~-~- Node-Red** ==
401 401  
375 +You can access the gateway's built-in AS server of (% style="color:blue" %)**Node-Red **(%%)via the URL((% style="background-color:yellow" %)__**//http:~/~/<hostname>:1880 or http:~/~/<local-IPV4-address>//**__(%%)) in your browser.
402 402  
403 -You can access the gateway's built-in AS server of **Node-Red **via the URL((% style="background-color:yellow" %)__**//http:~/~/<hostname>:8080 or http:~/~/<local-IPV4-address>//**__(%%)) in your browser.
404 404  
378 +Such as (% style="background-color:yellow" %)__**//http:~/~/dragino-54ff12:1880  or http:~/~/<Local-IPV4-Address>//**__
405 405  
406 -Such as (% style="background-color:yellow" %)__**//http:~/~/dragino-54ff12:8080  or http:~/~/<Local-IPV4-Address>//**__
407 407  
408 -
409 409  [[image:image-20220725172124-3.png||height="610" width="843"]]
410 410  
411 411  
412 412  
413 -= **6. How users can access LPS8v2 using serial USB** =
385 +=== **Using Node-Red, InfluxDB and Grafana** ===
414 414  
387 +The LPS8-V2 supports this combination, the default, Node-red is pre-installed but the InfluxDB and Grafana is not pre-installed.
415 415  
416 -**USB TTL to LPS8v2  Connection:**
417 417  
390 +the users can refer to this link to install them.
391 +
392 +[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Armbian%20OS%20instruction/#H2.6HowtoinstallGrafanaandinfluxdb>>http://wiki.dragino.com/xwiki/bin/view/Main/Armbian%20OS%20instruction/#H2.6HowtoinstallGrafanaandinfluxdb]]
393 +
394 +
395 += 5. How users can access LPS8v2 using serial USB =
396 +
397 +
398 +(% style="color:blue" %)**USB TTL to LPS8v2  Connection:**
399 +
400 +
418 418  Port 1 of the UART on the LPS8v2 is GND
419 419  
420 420  (% class="box infomessage" %)
421 421  (((
422 -TXD  <~-~--> UART RXD (Gray line)
405 +**TXD  <~-~--> UART RXD (Gray line)**
423 423  
424 -RXD  <~-~--> UART TXD (White line)
407 +**RXD  <~-~--> UART TXD (White line)**
425 425  
426 -GND <~-~--> GND (Black line)
409 +**GND <~-~--> GND (Black line)**
427 427  )))
428 428  
429 429  
... ... @@ -442,11 +442,133 @@
442 442  [[image:image-20220804164747-2.png||height="622" width="594"]]
443 443  
444 444  
428 += 6. Use the helium gateway-rs as the Data-only Hotspot =
445 445  
446 -(% style="color:inherit; font-family:inherit; font-size:29px" %)**10. Supports**
447 447  
431 +== **Step 1: Configure Frequency Band** ==
448 448  
433 +
434 +//Each country has a requirement for frequency region. Choose the right one for your area.//
435 +
436 +[[image:image-20220905164308-1.png]]
437 +
438 +
439 +
440 +== **Step 2: Configure the forward address** ==
441 +
442 +
443 +**Select one of the servers to configure.**
444 +
445 +**For example:**
446 +
447 +[[image:image-20220905164847-2.png]]
448 +
449 +
450 +
451 +== **Step 3: Download and Install the Helium-gateway-rs** ==
452 +
453 +
454 +**Access the gateway CLI via SSH.**
455 +
456 +[[image:image-20220905165222-3.png]]
457 +
458 +
459 +**Download gateway-rs.**
460 +
461 +[[image:image-20220905165715-5.png]]
462 +
463 +(% class="box infomessage" %)
449 449  (((
465 +**Command: wget [[http:~~/~~/repo.dragino.com/release/tool/gateway-rs/helium-gateway-v1.0.0-alpha.31-raspi234.deb>>http://repo.dragino.com/release/tool/gateway-rs/helium-gateway-v1.0.0-alpha.31-raspi234.deb]]**
466 +)))
467 +
468 +
469 +**Install gateway-rs.**
470 +
471 +[[image:image-20220905165917-7.png]]
472 +
473 +(% class="box infomessage" %)
474 +(((
475 +**Command: dpkg -i helium-gateway-v1.0.0-alpha.31-raspi234.deb **
476 +)))
477 +
478 +
479 +**Modify configuration.**
480 +
481 +
482 +[[image:image-20220905173847-12.png]]
483 +
484 +
485 +(% class="box infomessage" %)
486 +(((
487 +**region=<Enter regional parameters> \
488 +&& sed -i '/region/d' /etc/helium_gateway/settings.toml && sed -i "1 i\region = \"$region\"" /etc/helium_gateway/settings.toml \
489 +&& sed -i '/region/d' /etc/helium_gateway/default.toml && sed -i "22 i\region = \"$region\"" /etc/helium_gateway/default.toml**
490 +)))
491 +
492 +
493 +**Restart the helium_gateway**
494 +
495 +[[image:image-20220905170920-9.png]]
496 +
497 +
498 +(% class="box infomessage" %)
499 +(((
500 +**systemctl restart helium_gateway**
501 +)))
502 +
503 +
504 +**Check the helium_gateway Log：**
505 +
506 +[[image:image-20220905173952-13.png]]
507 +
508 +
509 +(% class="box infomessage" %)
510 +(((
511 +**journalctl -u helium_gateway -f**
512 +)))
513 +
514 +
515 +(% style="color:red" %)**Note: if your device is not finished the onboarding, which is unable to connect to the Helium console.**
516 +
517 +where the helium gateway log is shown:
518 +
519 +[[image:image-20220905174534-14.png]]
520 +
521 +
522 +So you have to finish the onboarding, ~-~--Please refer to [[Step 2.7>>doc:Main.Notes for Helium.WebHome||anchor="H2.7A0Step6:OnboardingData-OnlyHotspot"]] to onboarding your LPS8-V2.
523 +
524 +
525 += 7. OTA System Update =
526 +
527 +
528 +LPS8v2 supports system auto update via OTA, please see **[[this URL>>url:http://wiki.dragino.com/xwiki/bin/view/OTA%20Update/]]** for the detail of this feature.
529 +
530 +
531 += 8. Trouble Shooting =
532 +
533 +== 8.1  I can't log in to the built-in Server TTN Stack which shows '**Login failed**'. ==
534 +
535 +
536 +[[image:image-20220920135918-1.png]]
537 +
538 +
539 +This is caused by the inconsistency between the built-in TTN-Stack domain configuration and your login URL.
540 +
541 +By default, ttn-stack uses the gateway's domain name for URL resolution, but in some networks, they prefer to resolve IP-v4 addresses.
542 +
543 +
544 +So you can change the domain name of the TTN-Stack configuration to the IPv4 address.
545 +
546 +**Click the update URL button to configure the URL with the current eth port address.**
547 +
548 +[[image:image-20220920141936-2.png]]
549 +
550 +
551 += (% style="color:inherit; font-family:inherit; font-size:29px" %)9. Supports(%%) =
552 +
553 +
554 +(((
450 450  **//If you are experiencing issues and can't solve them, you can send mail to [[support@dragino.com>>mailto:support@dragino.com]].//**
451 451  )))
452 452  
... ... @@ -454,19 +454,17 @@
454 454  **//With your question as detailed as possible. We will reply and help you in the shortest.//**
455 455  
456 456  
562 += 10. Reference =
457 457  
458 -= **11 Reference** =
459 459  
460 -
461 461  * Install Tago Core: Refer **Install Tago Core in LPS8v2** in[[ Instruction>>doc:Main.Tago\.IO.WebHome]].
462 462  * [[Advance OS Reference Guide for LPS8v2>>doc:Main.Armbian OS instruction.WebHome]].
463 463  
464 464  
465 -
466 466  
467 467  )))
468 468  
469 -= **12. Order Info** =
572 += 11. Order Info =
470 470  
471 471  
472 472  (% style="color:#0000ff" %)**LPS8v2-XXX-YYY**
... ... @@ -490,10 +490,9 @@
490 490  More info about valid bands, please see [[EC25-E product page>>url:https://www.quectel.com/product/ec25.htm]].
491 491  
492 492  
596 += 12. Manufacturer Info =
493 493  
494 -= **13. Manufacturer Info** =
495 495  
496 -
497 497  **Shenzhen Dragino Technology Development co. LTD**
498 498  
499 499  Room 202, Block B, BCT Incubation Bases (BaoChengTai),  No.8 CaiYunRoad
... ... @@ -501,10 +501,9 @@
501 501  LongCheng Street, LongGang District ; Shenzhen 518116,China
502 502  
503 503  
606 += 13. FCC Warning =
504 504  
505 -= **14. FCC Warning** =
506 506  
507 -
508 508  (((
509 509  This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
510 510  )))
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