Changes for page PG1302 -- LoRaWAN Concentrator User Manual
Last modified by Kilight Cao on 2024/06/22 10:43
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... ... @@ -14,12 +14,11 @@ 14 14 15 15 ))) 16 16 17 -= **1. Introduction**=17 += 1. Introduction = 18 18 19 +== 1.1 What is PG1302 LoRaWAN Concentrator? == 19 19 20 -== **1.1 What is PG1302 LoRaWAN Concentrator?** == 21 21 22 - 23 23 ((( 24 24 The PG1302 is a (% style="color:green" %)**multi-channel high-performance transmitter/receiver**(%%) designed to simultaneously receive several LoRa packets using random spreading factors on random channels. Its goal is to enable robust connection between a central wireless data concentrator and a massive amount of wireless end-points spread over a very wide range of distances. 25 25 ))) ... ... @@ -33,38 +33,33 @@ 33 33 ))) 34 34 35 35 35 +== 1.2 Features == 36 36 37 -== **1.2 Features** == 38 38 39 - 40 40 * Base on Semtech SX1302 solution 41 -* Support Raspberry Pi 3B/3B+/4 39 +* Support Raspberry Pi 3B/3B+/4, TinkerBoard2/2S, Orange Pi Pc/PC PLUS. 42 42 * Up to -140dBm sensitivity 43 43 * Support 3.3v and 5v. 44 44 * Mini-PCIe Interface 45 45 * Converter board to support Raspberry Pi 46 46 45 +== 1.3 General Interfaces for PG1302 == 47 47 48 48 49 -== **1.3 General Interfaces for PG1302** == 50 - 51 - 52 52 * SPI interface for LoRa 53 53 * Power Input: 5v, 1A 54 54 * 1 x I-PEX for LoRa 51 +* Working Temperature: -40 ℃ ~~ 80℃ 55 55 53 +== 1.4 Pin Mapping == 56 56 57 57 58 -== **1.4 Pin Mapping** == 59 - 60 - 61 61 [[image:1651743282627-547.png||height="402" width="425"]] 62 62 63 63 59 +== 1.5 LEDs == 64 64 65 -== **1.5 LEDs** == 66 66 67 - 68 68 ((( 69 69 TX: Blink when transmit a packet 70 70 RX: Blink when receive a packet ... ... @@ -72,19 +72,17 @@ 72 72 ))) 73 73 74 74 69 +== 1.6 Power Consumption == 75 75 76 -== **1.6 Power Consumption** == 77 77 78 - 79 79 <300mA @ 3.3v. 80 80 81 81 Detail Test Report see [[this link>>https://www.dropbox.com/sh/89virm4y0b02c7i/AAA-cgQEsSc8gNGFYAB0qZ_Za?dl=0]] 82 82 83 83 77 +== 1.7 Applications == 84 84 85 -== **1.7 Applications** == 86 86 87 - 88 88 * Smart Buildings & Home Automation 89 89 * Logistics and Supply Chain Management 90 90 * Smart Metering ... ... @@ -92,14 +92,11 @@ 92 92 * Smart Cities 93 93 * Smart Factory 94 94 87 += 2. Example: Set up as LoRaWAN gateway = 95 95 89 +== 2.1 System structure == 96 96 97 -= **2. Example: Set up as LoRaWAN gateway** = 98 98 99 - 100 -== **2.1 System structure** == 101 - 102 - 103 103 ((( 104 104 This example is an example to show how to set up the PG1302 + RPi as a LoRaWAN gateway to use with [[TheThingsNetwork>>url:http://www.thethingsnetwork.org/]](TTN) LoRaWAN server. Set up method for other server are similar. 105 105 ... ... @@ -109,41 +109,43 @@ 109 109 [[image:1651743698677-436.png||height="457" width="686"]] 110 110 111 111 101 +== 2.2 Hardware Installation == 112 112 113 -== **2.2 Hardware Installation** == 114 114 115 - 116 116 (% style="color:red" %)**Important Notice: Please power the RPI with 5V,3A cable.** 117 117 118 118 [[image:image-20220621104746-1.png||height="381" width="451"]] 119 119 120 120 109 += 3. Install the software? = 121 121 122 -= **3. Install the software?** = 123 123 112 +**Raspberry Pi 3B/3B+/4,** 124 124 125 -There are two ways to install the software in RPi4 to use PG1302. 126 - 127 127 * Flash SD card with Dragino pre-build image which supports Web UI. 128 -* Install Loratforwarder in existing RPi OS.115 +* Install [[Dragino-FWD>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/PG1302/#H5.2.2.A0Selecttheappropriatedeviceversiontodownload:]] in existing RPi OS. 129 129 117 +**TinkerBoard2/2S, ** 130 130 119 +* Install [[Dragino-FWD>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/PG1302/#H5.2.2.A0Selecttheappropriatedeviceversiontodownload:]] in the existing OS. 131 131 132 - =**4. Flashwithpre-buildimage**=121 +**Orange Pi PC/PC PLUS.** 133 133 123 +* Install [[Dragino-FWD>>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/PG1302/#H5.2.2.A0Selecttheappropriatedeviceversiontodownload:]] in the existing OS. 134 134 135 -= =**4.1Downloadthedraginoimagefor RPI**==125 += 4. Flash with pre-build image = 136 136 127 +== 4.1 Download the dragino image for RPI == 137 137 129 + 138 138 ((( 139 139 Download PG1302_for_Rpi4_64_with_webui from: [[https:~~/~~/www.dropbox.com/sh/f6nbldh1qbspya5/AACgL6pDkwdBQO1BQqq_Nubwa?dl=0>>https://www.dropbox.com/sh/f6nbldh1qbspya5/AACgL6pDkwdBQO1BQqq_Nubwa?dl=0]] 140 140 ))) 141 141 142 142 135 +== 4.2 Flash the image to an SD card == 143 143 144 -== **4.2 Flash the image to an SD card** == 145 145 146 - 147 147 Flash the image to the SD card: 148 148 149 149 [[image:1651744119133-233.png||height="373" width="621"]] ... ... @@ -152,10 +152,9 @@ 152 152 (% style="color:red" %)**Note: Download the flash tool following this link:**[[https:~~/~~/www.balena.io/etcher/>>https://www.balena.io/etcher/]] 153 153 154 154 146 +== 4.3 Access the Linux console == 155 155 156 -== **4.3 Access the Linux console** == 157 157 158 - 159 159 ((( 160 160 Connect the RPI Ethernet port to your router, RPi will obtain an IP address from your router. In the router's management portal, you should be able to find what IP address the router has assigned to the RPI. You can use this IP to connect the WEB UI or SSH access of RPI. Make sure your PC and the RPI is in the same network, then use a SSH tool (such as [[putty>>url:http://www.chiark.greenend.org.uk/~~sgtatham/putty/download.html]]) to access it. Below are screenshots 161 161 ))) ... ... @@ -192,13 +192,11 @@ 192 192 [[image:1651744358515-107.png||height="366" width="581"]] 193 193 194 194 185 +== 4.4 Access the WebUI of RPi4 == 195 195 196 -== **4.4AccesstheWebUI of RPi4**==187 +=== 4.4.1 Home page === 197 197 198 198 199 -=== **4.4.1 Home page** === 200 - 201 - 202 202 ((( 203 203 Open a browser on the PC and type the RPI ip address **http:~/~/IP_ADDRESS ** (If the IP is assigned by the uplink router) 204 204 You will see the login interface of RPI as shown below. ... ... @@ -215,10 +215,9 @@ 215 215 [[image:1651744457761-993.png||height="352" width="621"]] 216 216 217 217 206 +=== 4.4.2 LoRa Page === 218 218 219 -=== **4.4.2 LoRa Page** === 220 220 221 - 222 222 This page shows the LoRa Radio Settings. There are a set of default frequency band according to LoRaWAN protocol, and user can customize the band* as well. 223 223 224 224 ... ... @@ -235,13 +235,11 @@ 235 235 (% style="color:red" %)**Note *: [[See this instruction for how to customize frequency band>>doc:Main.How to customized LoRaWAN frequency band.WebHome]]** 236 236 237 237 225 +=== 4.4.3 LoRaWAN Page === 238 238 239 -=== **4.4.3LoRaWANPage**===227 +==== 4.4.3.1 Semtech UDP ==== 240 240 241 241 242 -==== **4.4.3.1 Semtech UDP** ==== 243 - 244 - 245 245 [[image:1651744767914-283.png||height="352" width="621"]] 246 246 247 247 ... ... @@ -248,10 +248,9 @@ 248 248 (% style="color:red" %)**Note *: [[See this instruction for how to configure TTN>>doc:Main.Notes for TTN.WebHome]].** 249 249 250 250 236 +==== 4.4.3.2 Basic Station ==== 251 251 252 -==== **4.4.3.2 Basic Station** ==== 253 253 254 - 255 255 [[image:1651744890629-683.png||height="380" width="621"]] 256 256 257 257 ... ... @@ -258,13 +258,11 @@ 258 258 (% style="color:red" %)**Note *: [[See this instruction for how to configure AWS-loT-Core>>doc:Main.AWS IoT Core for LoRaWAN.WebHome]].** 259 259 260 260 245 +=== 4.4.4 LogRead === 261 261 262 -=== **4.4.4 LogRead**===247 +==== 4.4.4.1 LoRa Log ==== 263 263 264 264 265 -==== **4.4.4.1 LoRa Log** ==== 266 - 267 - 268 268 [[image:1651744955955-452.png||height="571" width="621"]] 269 269 270 270 ... ... @@ -271,10 +271,9 @@ 271 271 Show the frequency for LoRa Radio and traffics. 272 272 273 273 256 +==== 4.4.4.2 System Log ==== 274 274 275 -==== **4.4.4.2 System Log** ==== 276 276 277 - 278 278 Show system log. 279 279 280 280 ... ... @@ -281,10 +281,9 @@ 281 281 [[image:1651745003470-264.png||height="477" width="621"]] 282 282 283 283 265 +==== 4.4.4.3 Record Log ==== 284 284 285 -==== **4.4.4.3 Record Log** ==== 286 286 287 - 288 288 **Record the system log.** 289 289 290 290 ... ... @@ -291,13 +291,39 @@ 291 291 [[image:1651745069814-662.png||height="144" width="621"]] 292 292 293 293 274 += 5. Install stand-alone LoRa Packet Forwarder = 294 294 295 -= **5.Installstand-aloneLoRaPacketForwarder**=276 +== 5.1 Choose the right installation package for your OS == 296 296 297 297 298 -== **5.1 OS requirement** == 279 +((( 280 +**draginofwd-32bit (RPI, Orange PI)** 299 299 282 +**Download URL:** https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-32bit.deb 300 300 284 +**Linux Command:** wget https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-32bit.deb && dpkg -i draginofwd-32bit.deb 285 + 286 + 287 +**dragino-64bit (RPI, Orange PI)** 288 + 289 +**Download URL: **https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-64bit.deb 290 +))) 291 + 292 +**Linux Command: **wget https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-64bit.deb && dpkg -i draginofwd-64bit.deb 293 + 294 + 295 +**dragino-tiker-32bit (Tinker Board)** 296 + 297 +**Download URL: **https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-tinker-32bit.deb 298 + 299 +**Linux Command: **wget https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-tinker-32bit.deb && dpkg -i draginofwd-tinker-32bit.deb 300 + 301 + 302 +**Install details:** 303 + 304 +[[image:image-20220928181226-1.png||height="218" width="1100"]] 305 + 306 + 301 301 RPI in this example is RPI model 4B with fresh Raspbian OS install. 302 302 303 303 (% class="box" %) ... ... @@ -317,10 +317,25 @@ 317 317 ))) 318 318 319 319 326 +== 5.2 Select the mode of connection to the server == 320 320 321 -== **5.2 Get Gateway ID in Raspberry and input this in TTN v3** == 322 322 329 +The Dragino LoRa Packet Forware supports the Semtech UDP and Basic Station mode. 323 323 331 +The User can choose one of the methods as the connection mode. 332 + 333 + 334 +**~1. Semtech UDP Mode ~-~-> 5.2.1** 335 + 336 +**2. Basic Station Mode ~-~-> 5.2.2** 337 + 338 + 339 +=== 5.2.1 Semtech UDP Mode === 340 + 341 + 342 +==== a). Get a gateway EUI from the device ETH MAC. ==== 343 + 344 + 324 324 In RPI, run the below command to get a Gateway ID 325 325 326 326 (% class="box infomessage" %) ... ... @@ -335,7 +335,9 @@ 335 335 ((( 336 336 We got the ether (eth0 MAC) address is b8:27:eb:49:62:bc). Add ffff at the end and remove “:” to get the gateway ID: b827ebxxxxbcffff. Input this to TTN v3. Make sure to select legacy packet forwarder. 337 337 338 - 359 + 360 + 361 +==== b). Input this Gateway EUI to the TTN-Stack ==== 339 339 ))) 340 340 ))) 341 341 ... ... @@ -344,30 +344,29 @@ 344 344 [[image:1651745306744-481.png||height="478" width="621"]] 345 345 346 346 347 -After setup, the status should show not connected as below:370 +==== c). After Register, the status should show not connected as below: ==== 348 348 349 349 [[image:1651745366987-458.png||height="363" width="621"]] 350 350 351 351 375 +==== d). Enable SPI and I2C on your device ==== 352 352 353 - ===**5.2.1 DownloadandinstallLoRaWANpacket forwarder**===377 +**the below example is using Raspberry 4B.** 354 354 355 355 356 -Enable SPI and I2C first: 357 - 358 -a) SPI needs to be enabled on the Raspberry Pi 359 - 360 360 Run (% style="background-color:yellow" %) **sudo raspi-config**(%%) to open the config window 361 361 362 362 [[image:1651745476754-240.png||height="234" width="629"]] 363 363 384 + 364 364 [[image:image-20220505181135-1.png]] 365 365 387 + 366 366 [[image:image-20220505181135-2.png||height="229" width="622"]] 367 367 368 368 369 369 370 - InRPI,Fist:Enter the root account:392 +==== e). Access the root account: ==== 371 371 372 372 ((( 373 373 [[image:1651745583363-614.png||height="151" width="732"]] ... ... @@ -375,69 +375,59 @@ 375 375 376 376 ))) 377 377 400 +==== f). Modify the configuration of FWD ==== 378 378 379 -Select the appropriate device version to download 380 380 381 - 382 382 ((( 383 -draginofwd-32bit 384 - 385 -wget https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-32bit.deb && dpkg -i draginofwd-32bit.deb 386 - 387 - 388 -dragino-64bit 404 +After installation, user can find the configuration file in** (% style="color:#0000ff" %)/etc/lora/ (%%)**Replace the gateway ID we got above to the (% style="color:#0000ff" %)**gateway_ID** (%%)in file (% style="color:#0000ff" %)**local_conf.json.** 389 389 ))) 390 390 391 -wget https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-64bit.deb && dpkg -i draginofwd-64bit.deb 407 +((( 408 +The default LoRaWAN server points to localhost, user need to put the correct server address to the server_address field in file (% style="color:#0000ff" %)**local_conf.json**(%%), like below. 392 392 393 393 394 -dragi no-tiker-32bit411 +the User can find the lora configuration directory in (% style="color:#0000ff" %)**/etc/lora/**(%%) there are the cfg-302 directory and the global_conf.json, and local_conf.json files. 395 395 396 -wget https:~/~/www.dragino.com/downloads/downloads/LoRa_Gateway/PG1302/software/draginofwd-tinker-32bit.deb && dpkg -i draginofwd-tinker-32bit.deb 413 +/etc/lora/ 414 +├── cfg-302 ~-~--> global configuration file 415 +├── devskey ~-~--> Database 416 +├── global_conf.json ~-~--> Frequency plan for current applications 417 +└── local_conf.json ~-~--> Local fwd configuration 397 397 419 +At default, the users need to change two configurations file: global_conf.json and local_conf.json. 398 398 399 -((( 400 - 421 +===== **1.) Configure gateway EUI and server address, port for fwd** ===== 401 401 402 -[[image:image-20220928181226-1.png]] 403 - 404 404 405 405 ))) 406 406 407 - === **5.2.2 ConfigGatewayID, Frequency Bandand Server address**===426 +[[image:1651745709709-887.png||height="820" width="621"]] 408 408 409 409 410 -((( 411 -After installation, user can find the configuration file in** (% style="color:#0000ff" %)/etc/lora/ (%%)**Replace the gateway ID we got above to the (% style="color:#0000ff" %)**gateway_ID** (%%)in file (% style="color:#0000ff" %)**local_conf.json.** 412 -))) 429 +**Note: Users can find the TTN v3 server address from [[Server Addresses ~| The Things Stack for LoRaWAN (thethingsindustries.com)>>url:https://www.thethingsindustries.com/docs/getting-started/server-addresses/#deployments]]** 413 413 414 -((( 415 -The default LoRaWAN server points to localhost, user need to put the correct server address to the server_address field in file (% style="color:#0000ff" %)**local_conf.json**(%%), like below. 416 416 417 - 418 -))) 432 +===== **2). Override the global_conf.json file by selecting the appropriate frequency plan for your region in cfg-302** ===== 419 419 420 -[[image:1651745709709-887.png||height="820" width="621"]] 421 421 435 +the default frequency band is US915 in the (% style="color:#0000ff" %)**global_conf.json**(%%) file. 422 422 423 - User can find the TTN v3 serveraddress from:[[Server Addresses ~| The Things Stack for LoRaWAN (thethingsindustries.com)>>url:https://www.thethingsindustries.com/docs/getting-started/server-addresses/#deployments]]437 +[[image:1651745838008-820.png||height="650" width="621"]] 424 424 425 -And the default frequency band is US915 in (% style="color:#0000ff" %)**global_conf.json**(%%) file. 426 426 427 - [[image:1651745838008-820.png||height="650"width="621"]]440 +If the user wants to change to other frequency bands, the User can copy the file from(% style="color:#0000ff" %)** /etc/lora/cfg-302**(%%) ** **and put it into** (% style="color:#0000ff" %)/etc/lora/global_conf.json(%%).** 428 428 442 +**//eg: cp /etc/lora/cfg-302/EU-global_conf.json /etc/lora/global_conf.json //** 429 429 430 -* If user want to change to other frequency bands, User can copy the file from(% style="color:#0000ff" %)** /etc/lora/cfg-302**(%%) ** **and put it into** (% style="color:#0000ff" %)/etc/lora/global_conf.json(%%).** 431 431 432 -**~ 1). Chose your need the name of region frequency.** 433 433 446 +====== **Selecting the appropriate frequency plan for your region in cfg-302.** ====== 434 434 435 435 [[image:1651745867516-322.png||height="83" width="740"]] 436 436 437 437 451 +====== **Override the global_conf.json** ====== 438 438 439 -**~ 2). Use this command to copy it.** 440 - 441 441 (% class="box infomessage" %) 442 442 ((( 443 443 **cp /etc/lora/cfg-302/EU-global_conf.json /etc/lora/global_conf.json** ... ... @@ -446,30 +446,20 @@ 446 446 [[image:1651745984006-868.png||height="87" width="745"]] 447 447 448 448 449 - *Ifuser wants to changetotherLoRaWAN server,modifythe(% style="color:#0000ff" %)**global_conf.json**(%%)file.461 +==== (% style="color:inherit; font-family:inherit; font-size:23px" %)g). Running the Fwd Server(%%) ==== 450 450 451 451 452 - 453 -=== **5.2.3 Check result** === 454 - 455 - 456 456 ((( 457 -Run below command to restart the dragino_fwd: 465 +Run the below command to restart the dragino_fwd: 458 458 ))) 459 459 460 460 ((( 461 461 (% class="box infomessage" %) 462 462 ((( 463 -**sudo systemctl stop draginofwd** 464 -))) 465 - 466 -(% class="box infomessage" %) 467 -((( 468 468 **sudo systemctl start draginofwd** 469 469 ))) 470 470 ))) 471 471 472 - 473 473 ((( 474 474 debug check the ruing status of fwd: 475 475 ))) ... ... @@ -484,15 +484,13 @@ 484 484 [[image:1651746045057-414.png||height="193" width="729"]] 485 485 486 486 489 +Wait for a few minutes, the gateway will be online/active on the TTN-Stack. 487 487 488 -The dragino_fwd will start with the new gateway ID and TTN v3 should show the connection ok: 489 - 490 - 491 491 [[image:1651746078253-168.png||height="372" width="621"]] 492 492 493 493 494 494 495 - Wecan checkdragino_fwd running statesin RPi byrunning:495 +Get the draginofwd real-time running log: 496 496 497 497 (% class="box infomessage" %) 498 498 ((( ... ... @@ -508,10 +508,8 @@ 508 508 [[image:1651746139304-966.png||height="326" width="621"]] 509 509 510 510 511 +==== h). Commands to handle service ==== 511 511 512 -=== **5.2.4 Commands to handle service** === 513 - 514 - 515 515 * (% style="color:#0000ff" %)**Stop** (%%)dragino_fwd service: sudo systemctl stop draginofwd 516 516 * (% style="color:#0000ff" %)**Disable**(%%) dragino_fwd auto run after boot: sudo systemctl disable draginofwd 517 517 * (% style="color:#0000ff" %)**Start** (%%)dragino_fwd : sudo systemctl start draginofwd ... ... @@ -519,10 +519,59 @@ 519 519 * (% style="color:#0000ff" %)**Show status** (%%)of dragino_fwd: sudo systemctl status draginofwd 520 520 521 521 520 +=== **5.2.2 Basic Station Mode.** === 522 522 523 -= **6. Order Info** = 524 524 523 +==== a). Get a gateway EUI from the device ETH MAC. ==== 525 525 525 + 526 +In RPI, run the below command to get a Gateway ID 527 + 528 +(% class="box infomessage" %) 529 +((( 530 +**~ ifconfig eth0** 531 +))) 532 + 533 +[[image:1651745210205-512.png||height="130" width="621"]] 534 + 535 + 536 +((( 537 +((( 538 +We got the ether (eth0 MAC) address is b8:27:eb:49:62:bc). Add ffff at the end and remove “:” to get the gateway ID: b827ebxxxxbcffff. Input this to TTN v3. Make sure to select legacy packet forwarder. 539 +))) 540 +))) 541 + 542 + 543 + 544 + 545 +b 546 + 547 + 548 + 549 + 550 +c 551 + 552 +d 553 + 554 +e 555 + 556 +f 557 + 558 +g 559 + 560 +h 561 + 562 +i 563 + 564 +j 565 + 566 +k 567 + 568 + 569 + 570 += 6. Order Info = 571 + 572 + 526 526 Part Number: (% style="color:#0000ff" %)**PG1302-XX** (%%) Or Part Number: (% style="color:#0000ff" %)**PG1302-PI-XX **(%%)(Include RPi converter board for RPI 3/4) 527 527 528 528 **~ (% style="color:#0000ff" %)XX:(%%)** ... ... @@ -531,10 +531,8 @@ 531 531 * (% style="color:red" %)**915** (%%)(For Bands: US915,AU915,AS923,KR920) 532 532 * (% style="color:red" %)**470** (%%)(For Band: CN470) 533 533 581 += 7. Packing Info = 534 534 535 - 536 -= **7. Packing Info** = 537 - 538 538 ((( 539 539 540 540 ... ... @@ -551,7 +551,6 @@ 551 551 ((( 552 552 553 553 554 - 555 555 **PG1302-PI Package Includes**: 556 556 ))) 557 557 ... ... @@ -560,16 +560,13 @@ 560 560 * RPi3/4 converter PCB 561 561 * Screws to hole converter PCB on RPI. 562 562 563 - 564 564 **PG1302-PI Dimension and weight: ** 565 565 566 566 * Device Size: 18 x 8 x 4 cm 567 567 * Weight: 150g 568 568 569 - 570 - 571 571 ((( 572 -= **8. Support**=613 += 8. Support = 573 573 574 574 575 575 (((