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                       Q1. Working principle and trigger setting of two neighboring exhibitions  | 
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                       I. RFID trigger should be placed  beside every object and range should be set like the right figure to avoid overlapping. | 
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                       One way to avoid  overlapping phenomenon is to install more triggers with smaller area and same  code in certain area. | 
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                       In this way, it will not overlapping with neighboring  object. | 
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                       II. If overlapping is inevitably, please  set the “Spell trigger” menu item to  “Enable” or “Intelligent” to avoid this problem. | 
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                       Enable: In this state, all the codes have been  triggered previously will not be triggered again. (For Rental mode)  | 
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                       Disable: In this state, it will trigger when received  new signal no matter has been triggered or not. | 
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                       Intelligent: In this state, when it received new signal, it will firstly judge if the  received signal code is last play | 
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                       record or not. If the code is last play record,  it will not trigger by this code again. | 
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                       Audio guide unit will work in three different situations as below: | 
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                       A. If “Spell trigger” menu item is set to “enable”, audio guide unit will  work like this: | 
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                       ① Visitor arrived at site A, audio  guide unit is triggered by code 0001. | 
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                       ② Visitor arrived at site B, audio  guide unit is triggered by code 0002.  | 
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                       ③ Visitor arrived at site C, audio  guide unit is triggered by code 0003. Because it has been triggered code 0002 | 
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                        just  now at site B, it will not be triggered by code 0002.  | 
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                        ④ Visitor arrived at site D, it  will keep playing current audio of code 0003. | 
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                       ⑤ Visitor arrived at site E, audio  guide unit will not be triggered again because has been triggered by code 0002. | 
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                        It will keep playing current audio of code 0003. | 
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                       ⑥ Visitor arrived at site F, audio  guide unit will not be triggered again because has been triggered by code 0002. | 
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                       It will keep playing current audio of code 0003. | 
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                       ⑦ Visitor arrived at site G, audio  guide unit will not be triggered again because has been triggered by code 0001. | 
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                       Remark: If  you have enabled spell trigger mode, please re-decode the audio guide unit by WD-900  before use | 
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                        it next time.  | 
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                       B. If “Spell trigger” menu item is set to “disable”, audio guide unit will  work like this: | 
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                       ① Visitor arrived at site A, audio  guide unit is triggered by code 0001. | 
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                       ② Visitor arrived at site B, audio  guide unit is triggered by code 0002. | 
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                       ③ Visitor arrived at site C, audio  guide unit is triggered continuously  between code 0002 and 0003. | 
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                       ④ Visitor arrived at site D, audio  guide unit is triggered by code 0003. | 
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                       ⑤ Visitor arrived at site E, audio  guide unit is triggered continuously  between code 0002 and 0003. | 
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                       ⑥ Visitor arrived at site F, audio  guide unit is triggered by code 0002. | 
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                       ⑦ Visitor arrived at site G, audio  guide unit is triggered by code 0001. | 
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                       C. If “Spell trigger” menu item is set to “Intelligent”,  audio guide unit will work like this: | 
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                       ① Visitor arrived at site A, audio  guide unit is triggered by code 0001. | 
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                       ② Visitor arrived at site B, audio  guide unit is triggered by code 0002.  | 
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                       ③ Visitor arrived at site C, audio  guide unit is triggered by code 0003. Because last playing record is audio  | 
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                        of code  0002, it will not be triggered by code 0002 again. | 
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                       ④ Visitor arrived at site D, it  will keep playing current audio of code 0003. | 
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                       ⑤ Visitor arrived at site E, audio  guide unit will not be triggered by code 0002 again because last | 
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                        playing record  is audio of code 0002. It will keep playing current audio of code 0003. | 
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                       ⑥ Visitor arrived at site F, audio  guide unit will not be triggered by code 0002 because last playing record  | 
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                        is  audio of code 0002. | 
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                       ⑦ Visitor arrived at site G, audio  guide unit will be triggered by code 0001, because last play record is  | 
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                        audio of  code 0002, not code 0001 itself. | 
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