Last modified by Xiaoling on 2023/05/26 14:19
<
From version < 151.2 >
edited by Xiaoling
on 2022/08/22 16:13
To version < 93.2 >
edited by Xiaoling
on 2022/07/15 14:35
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Summary

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Title
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1 -LA66 LoRaWAN Shield User Manual
1 +LA66 LoRaWAN Module
Content
... ... @@ -6,59 +6,41 @@
6 6  
7 7  
8 8  
9 += 1.  LA66 LoRaWAN Module =
9 9  
10 -= 1.  LA66 LoRaWAN Shield =
11 11  
12 +== 1.1  What is LA66 LoRaWAN Module ==
12 12  
13 -== 1.1  Overview ==
14 14  
15 -
16 16  (((
17 -[[image:image-20220715000826-2.png||height="145" width="220"]]
18 -)))
16 +[[image:image-20220715000242-1.png||height="110" width="132"]]
19 19  
20 -(((
21 -
18 +(% style="color:blue" %)**Dragino LA66**(%%) is a small wireless LoRaWAN module that offers a very compelling mix of long-range, low power consumption, and secure data transmission. It is designed to facilitate developers to quickly deploy industrial-level LoRaWAN and IoT solutions. It helps users to turn the idea into a practical application and make the Internet of Things a reality. It is easy to create and connect your things everywhere.
22 22  )))
23 23  
24 24  (((
25 -(% style="color:blue" %)**LA66 LoRaWAN Shield**(%%) is the Arduino shield base on LA66. Users can use LA66 LoRaWAN Shield to rapidly add LoRaWAN or peer-to-peer LoRa wireless function to  Arduino projects.
22 +(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.4 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
26 26  )))
27 27  
28 28  (((
29 -(((
30 -(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.3 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely.  This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
31 -)))
32 -)))
33 -
34 -(((
35 -(((
36 36  Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
37 37  )))
38 -)))
39 39  
40 40  (((
41 -(((
42 42  Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)**open-source peer-to-peer LoRa Protocol**(%%) for the none-LoRaWAN application.
43 43  )))
44 -)))
45 45  
46 46  (((
47 -(((
48 48  LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
49 49  )))
50 -)))
51 51  
52 52  
53 -
54 54  == 1.2  Features ==
55 55  
56 -
57 -* Arduino Shield base on LA66 LoRaWAN module
58 -* Support LoRaWAN v1.0.3 protocol
40 +* Support LoRaWAN v1.0.4 protocol
59 59  * Support peer-to-peer protocol
60 60  * TCXO crystal to ensure RF performance on low temperature
61 -* SMA connector
43 +* SMD Antenna pad and i-pex antenna connector
62 62  * Available in different frequency LoRaWAN frequency bands.
63 63  * World-wide unique OTAA keys.
64 64  * AT Command via UART-TTL interface
... ... @@ -67,10 +67,8 @@
67 67  
68 68  
69 69  
70 -
71 71  == 1.3  Specification ==
72 72  
73 -
74 74  * CPU: 32-bit 48 MHz
75 75  * Flash: 256KB
76 76  * RAM: 64KB
... ... @@ -91,129 +91,126 @@
91 91  
92 92  
93 93  
74 +== 1.4  AT Command ==
94 94  
95 -== 1.4  Pin Mapping & LED ==
76 +AT Command is valid over Main TXD and Main RXD. Serial Baud Rate is 9600. AT commands can be found in AT Command documents.
96 96  
97 97  
98 -[[image:image-20220817085048-1.png||height="533" width="734"]]
79 +== 1.5  Dimension ==
99 99  
81 +[[image:image-20220517072526-1.png]]
100 100  
101 101  
102 -~1. The LED lights up red when there is an upstream data packet
103 -2. When the network is successfully connected, the green light will be on for 5 seconds
104 -3. Purple light on when receiving downlink data packets
105 105  
85 +== 1.6  Pin Mapping ==
106 106  
107 -[[image:image-20220820112305-1.png||height="515" width="749"]]
108 108  
88 +[[image:image-20220523101537-1.png]]
109 109  
110 110  
111 -== 1.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
112 112  
92 +== 1.7  Land Pattern ==
113 113  
114 -**Show connection diagram：**
94 +[[image:image-20220517072821-2.png]]
115 115  
116 116  
117 -[[image:image-20220723170210-2.png||height="908" width="681"]]
118 118  
98 += 2.  LA66 LoRaWAN Shield =
119 119  
120 120  
121 -(% style="color:blue" %)**1.  open Arduino IDE**
101 +== 2.1  Overview ==
122 122  
123 123  
124 -[[image:image-20220723170545-4.png]]
104 +[[image:image-20220715000826-2.png||height="386" width="449"]]
125 125  
126 126  
107 +LA66 LoRaWAN Shield is the Arduino shield base on LA66. Users can use LA66 LoRaWAN Shield to rapidly add LoRaWAN or peer-to-peer LoRa wireless function to  Arduino projects.
127 127  
128 -(% style="color:blue" %)**2.  Open project**
109 +(((
110 +(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.4 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
111 +)))
129 129  
113 +(((
114 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
115 +)))
130 130  
131 -LA66-LoRaWAN-shield-AT-command-via-Arduino-UNO source code link: [[https:~~/~~/www.dropbox.com/sh/cx0pspkwu62pr97/AAAbKh2ioPdZfSDtdDpooYqha?dl=0>>https://www.dropbox.com/sh/cx0pspkwu62pr97/AAAbKh2ioPdZfSDtdDpooYqha?dl=0]]
117 +(((
118 +Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)**open-source peer-to-peer LoRa Protocol**(%%) for the none-LoRaWAN application.
119 +)))
132 132  
133 -[[image:image-20220726135239-1.png]]
121 +(((
122 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
123 +)))
134 134  
135 135  
126 +== 2.2  Features ==
136 136  
137 -(% style="color:blue" %)**3.  Click the button marked 1 in the figure to compile, and after the compilation is complete, click the button marked 2 in the figure to upload**
128 +* Arduino Shield base on LA66 LoRaWAN module
129 +* Support LoRaWAN v1.0.4 protocol
130 +* Support peer-to-peer protocol
131 +* TCXO crystal to ensure RF performance on low temperature
132 +* SMA connector
133 +* Available in different frequency LoRaWAN frequency bands.
134 +* World-wide unique OTAA keys.
135 +* AT Command via UART-TTL interface
136 +* Firmware upgradable via UART interface
137 +* Ultra-long RF range
138 138  
139 -[[image:image-20220726135356-2.png]]
140 140  
141 141  
141 +== 2.3  Specification ==
142 142  
143 -(% style="color:blue" %)**4.  After the upload is successful, open the serial port monitoring and send the AT command**
143 +* CPU: 32-bit 48 MHz
144 +* Flash: 256KB
145 +* RAM: 64KB
146 +* Input Power Range: 1.8v ~~ 3.7v
147 +* Power Consumption: < 4uA.
148 +* Frequency Range: 150 MHz ~~ 960 MHz
149 +* Maximum Power +22 dBm constant RF output
150 +* High sensitivity: -148 dBm
151 +* Temperature:
152 +** Storage: -55 ~~ +125℃
153 +** Operating: -40 ~~ +85℃
154 +* Humidity:
155 +** Storage: 5 ~~ 95% (Non-Condensing)
156 +** Operating: 10 ~~ 95% (Non-Condensing)
157 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
158 +* LoRa Rx current: <9 mA
159 +* I/O Voltage: 3.3v
144 144  
145 145  
146 -[[image:image-20220723172235-7.png||height="480" width="1027"]]
147 147  
163 +== 2.4  Pin Mapping & LED ==
148 148  
149 149  
150 -== 1.6  Example: Join TTN network and send an uplink message, get downlink message. ==
151 151  
167 +== 2.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
152 152  
153 -(% style="color:blue" %)**1.  Open project**
154 154  
155 155  
156 -Join-TTN-network source code link: [[https:~~/~~/www.dropbox.com/sh/0sjyncafa0gjv00/AACC2m1orov-QHRkvH8-ddCka?dl=0>>https://www.dropbox.com/sh/0sjyncafa0gjv00/AACC2m1orov-QHRkvH8-ddCka?dl=0]]
171 +== 2.6  Example: Join TTN network and send an uplink message, get downlink message. ==
157 157  
158 158  
159 -[[image:image-20220723172502-8.png]]
160 160  
175 +== 2.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in DataCake. ==
161 161  
162 162  
163 -(% style="color:blue" %)**2.  Same steps as 2.5,after opening the serial port monitoring, it will automatically connect to the network and send packets**
164 164  
179 +== 2.8  Upgrade Firmware of LA66 LoRaWAN Shield ==
165 165  
166 -[[image:image-20220723172938-9.png||height="652" width="1050"]]
167 167  
182 +=== 2.8.1  Items needed for update ===
168 168  
169 -
170 -== 1.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in Node-RED. ==
171 -
172 -
173 -(% style="color:blue" %)**1.  Open project**
174 -
175 -
176 -Log-Temperature-Sensor-and-send-data-to-TTN source code link: [[https:~~/~~/www.dropbox.com/sh/0aagmrpec1lxmva/AABMXWVMSHG9dK1_Zv_7xOmCa?dl=0>>https://www.dropbox.com/sh/0aagmrpec1lxmva/AABMXWVMSHG9dK1_Zv_7xOmCa?dl=0]]
177 -
178 -
179 -[[image:image-20220723173341-10.png||height="581" width="1014"]]
180 -
181 -
182 -
183 -(% style="color:blue" %)**2.  Same steps as 2.5,after opening the serial port monitoring, it will automatically connect to the network and send packets**
184 -
185 -
186 -[[image:image-20220723173950-11.png||height="665" width="1012"]]
187 -
188 -
189 -
190 -(% style="color:blue" %)**3.  Integration into Node-red via TTNV3**
191 -
192 -For the usage of Node-RED, please refer to: [[http:~~/~~/8.211.40.43:8080/xwiki/bin/view/Main/Node-RED/>>http://8.211.40.43:8080/xwiki/bin/view/Main/Node-RED/]]
193 -
194 -[[image:image-20220723175700-12.png||height="602" width="995"]]
195 -
196 -
197 -
198 -== 1.8  Upgrade Firmware of LA66 LoRaWAN Shield ==
199 -
200 -
201 -=== 1.8.1  Items needed for update ===
202 -
203 -
204 204  1. LA66 LoRaWAN Shield
205 205  1. Arduino
206 206  1. USB TO TTL Adapter
207 207  
208 -
209 -
210 210  [[image:image-20220602100052-2.png||height="385" width="600"]]
211 211  
212 212  
191 +=== 2.8.2  Connection ===
213 213  
214 -=== 1.8.2  Connection ===
215 215  
216 -
217 217  [[image:image-20220602101311-3.png||height="276" width="600"]]
218 218  
219 219  
... ... @@ -236,31 +236,28 @@
236 236  [[image:image-20220602102240-4.png||height="304" width="600"]]
237 237  
238 238  
216 +=== 2.8.3  Upgrade steps ===
239 239  
240 -=== 1.8.3  Upgrade steps ===
241 241  
219 +==== 1.  Switch SW1 to put in ISP position ====
242 242  
243 243  
244 -==== (% style="color:blue" %)1.  Switch SW1 to put in ISP position(%%) ====
245 -
246 -
247 247  [[image:image-20220602102824-5.png||height="306" width="600"]]
248 248  
249 249  
250 250  
251 -==== (% style="color:blue" %)2.  Press the RST switch once(%%) ====
226 +==== 2.  Press the RST switch once ====
252 252  
253 253  
254 -[[image:image-20220817085447-1.png]]
229 +[[image:image-20220602104701-12.png||height="285" width="600"]]
255 255  
256 256  
257 257  
233 +==== 3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade ====
258 258  
259 -==== (% style="color:blue" %)3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade(%%) ====
260 260  
261 -
262 262  (((
263 -(% style="color:blue" %)**1. Software download link:  **(%%)**[[https:~~/~~/www.dropbox.com/sh/j0qyc7a9ejit7jk/AACtx2tK4gEv6YFXMIVUM4dLa?dl=0>>https://www.dropbox.com/sh/j0qyc7a9ejit7jk/AACtx2tK4gEv6YFXMIVUM4dLa?dl=0]]**
237 +(% style="color:blue" %)**1. Software download link:  [[https:~~/~~/www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/Utility/LSN50N/>>https://www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/Utility/LSN50N/]]**
264 264  )))
265 265  
266 266  
... ... @@ -315,22 +315,200 @@
315 315  
316 316  
317 317  
318 -= 2.  FAQ =
292 += 3.  LA66 USB LoRaWAN Adapter =
319 319  
320 320  
321 -== 2.1  How to Compile Source Code for LA66? ==
295 +== 3.1  Overview ==
322 322  
297 +[[image:image-20220715001142-3.png||height="145" width="220"]]
323 323  
324 -Compile and Upload Code to ASR6601 Platform ：[[Instruction>>Main.User Manual for LoRaWAN End Nodes.LA66 LoRaWAN Module.Compile and Upload Code to ASR6601 Platform.WebHome]]
299 +(% style="color:blue" %)**LA66 USB LoRaWAN Adapter**(%%) is designed to fast turn USB devices to support LoRaWAN wireless features. It combines a CP2101 USB TTL Chip and LA66 LoRaWAN module which can easy to add LoRaWAN wireless feature to PC / Mobile phone or an embedded device that has USB Interface.
325 325  
301 +(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.4 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
326 326  
303 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
327 327  
328 -= 3.  Order Info =
305 +Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)**open-source peer-to-peer LoRa Protocol**(%%) for the none-LoRaWAN application.
329 329  
307 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
330 330  
331 -**Part Number:**   (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%)
332 332  
310 +== 3.2  Features ==
333 333  
312 +* LoRaWAN USB adapter base on LA66 LoRaWAN module
313 +* Ultra-long RF range
314 +* Support LoRaWAN v1.0.4 protocol
315 +* Support peer-to-peer protocol
316 +* TCXO crystal to ensure RF performance on low temperature
317 +* Spring RF antenna
318 +* Available in different frequency LoRaWAN frequency bands.
319 +* World-wide unique OTAA keys.
320 +* AT Command via UART-TTL interface
321 +* Firmware upgradable via UART interface
322 +
323 +
324 +
325 +== 3.3  Specification ==
326 +
327 +* CPU: 32-bit 48 MHz
328 +* Flash: 256KB
329 +* RAM: 64KB
330 +* Input Power Range: 5v
331 +* Frequency Range: 150 MHz ~~ 960 MHz
332 +* Maximum Power +22 dBm constant RF output
333 +* High sensitivity: -148 dBm
334 +* Temperature:
335 +** Storage: -55 ~~ +125℃
336 +** Operating: -40 ~~ +85℃
337 +* Humidity:
338 +** Storage: 5 ~~ 95% (Non-Condensing)
339 +** Operating: 10 ~~ 95% (Non-Condensing)
340 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
341 +* LoRa Rx current: <9 mA
342 +
343 +
344 +
345 +== 3.4  Pin Mapping & LED ==
346 +
347 +
348 +
349 +== 3.5  Example: Send & Get Messages via LoRaWAN in PC ==
350 +
351 +
352 +Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
353 +
354 +
355 +(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN adapter to PC**
356 +
357 +
358 +[[image:image-20220602171217-1.png||height="538" width="800"]]
359 +
360 +
361 +Open the serial port tool
362 +
363 +[[image:image-20220602161617-8.png]]
364 +
365 +[[image:image-20220602161718-9.png||height="457" width="800"]]
366 +
367 +
368 +
369 +(% style="color:blue" %)**2. Press the reset switch RST on the LA66 USB LoRaWAN Adapter to reset it.**
370 +
371 +The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully Join the LoRaWAN network
372 +
373 +
374 +[[image:image-20220602161935-10.png||height="498" width="800"]]
375 +
376 +
377 +
378 +(% style="color:blue" %)**3. See Uplink Command**
379 +
380 +Command format: (% style="color:#4472c4" %)** AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>**
381 +
382 +example: AT+SENDB=01,02,8,05820802581ea0a5
383 +
384 +[[image:image-20220602162157-11.png||height="497" width="800"]]
385 +
386 +
387 +
388 +(% style="color:blue" %)**4. Check to see if TTN received the message**
389 +
390 +[[image:image-20220602162331-12.png||height="420" width="800"]]
391 +
392 +
393 +
394 +== 3.6  Example: Send PC's CPU/RAM usage to TTN via python ==
395 +
396 +
397 +**Use python as an example：**[[https:~~/~~/github.com/dragino/LA66/blob/main/Send_information_to_TTN_WindosPC.py>>https://github.com/dragino/LA66/blob/main/Send_information_to_TTN_WindosPC.py]]
398 +
399 +
400 +(% style="color:red" %)**Preconditions:**
401 +
402 +(% style="color:red" %)**1. LA66 USB LoRaWAN Adapter works fine**
403 +
404 +(% style="color:red" %)**2. LA66 USB LoRaWAN Adapter  is registered with TTN**
405 +
406 +
407 +
408 +(% style="color:blue" %)**Steps for usage:**
409 +
410 +(% style="color:blue" %)**1.**(%%) Press the reset switch RESET on the LA66 USB LoRaWAN Adapter
411 +
412 +(% style="color:blue" %)**2.**(%%) Run the python script in PC and see the TTN
413 +
414 +[[image:image-20220602115852-3.png||height="450" width="1187"]]
415 +
416 +
417 +
418 +== 3.7  Example: Send & Get Messages via LoRaWAN in RPi ==
419 +
420 +
421 +Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
422 +
423 +
424 +(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN Adapter to the Raspberry Pi**
425 +
426 +[[image:image-20220602171233-2.png||height="538" width="800"]]
427 +
428 +
429 +
430 +(% style="color:blue" %)**2. Install Minicom in RPi.**
431 +
432 +(% id="cke_bm_509388S" style="display:none" %) (%%)Enter the following command in the RPi terminal
433 +
434 + (% style="background-color:yellow" %)**apt update**
435 +
436 + (% style="background-color:yellow" %)**apt install minicom**
437 +
438 +
439 +Use minicom to connect to the RPI's terminal
440 +
441 +[[image:image-20220602153146-3.png||height="439" width="500"]]
442 +
443 +
444 +
445 +(% style="color:blue" %)**3. Press the reset switch RST on the LA66 USB LoRaWAN Adapter.**
446 +
447 +The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully entered the network.
448 +
449 +
450 +[[image:image-20220602154928-5.png||height="436" width="500"]]
451 +
452 +
453 +
454 +(% style="color:blue" %)**4. Send Uplink message**
455 +
456 +Format: (% style="color:#4472c4" %)**AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>**
457 +
458 +example: AT+SENDB=01,02,8,05820802581ea0a5
459 +
460 +
461 +[[image:image-20220602160339-6.png||height="517" width="600"]]
462 +
463 +
464 +
465 +Check to see if TTN received the message
466 +
467 +[[image:image-20220602160627-7.png||height="369" width="800"]]
468 +
469 +
470 +
471 +== 3.8  Example: LA66 USB Module got a message from LA66 LoRa Shield and send the sensor data to NodeRed. ==
472 +
473 +
474 +
475 +== 3.9  Upgrade Firmware of LA66 USB LoRaWAN Adapter ==
476 +
477 +
478 +
479 +
480 += 4.  Order Info =
481 +
482 +
483 +**Part Number:**  (% style="color:blue" %)**LA66-XXX**(%%), (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%) **or**  (% style="color:blue" %)**LA66-USB-LoRaWAN-Adapter-XXX**
484 +
485 +
334 334  (% style="color:blue" %)**XXX**(%%): The default frequency band
335 335  
336 336  * (% style="color:red" %)**AS923**(%%):  LoRaWAN AS923 band
... ... @@ -343,12 +343,8 @@
343 343  * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
344 344  * (% style="color:red" %)**PP**(%%):  Peer to Peer LoRa Protocol
345 345  
498 += 5.  Reference =
346 346  
500 +* Hardware Design File for LA66 LoRaWAN Shield, LA66 USB LoRaWAN Adapter : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]
347 347  
348 -
349 -= 4.  Reference =
350 -
351 -
352 -* Hardware Design File for LA66 LoRaWAN Shield : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]
353 -
354 354  
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