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ENGLISH
9
 
Precautions for connection
Notice
• 
When connecting 5 or more HDD extension units (with 2 HDDs mounted on each unit) to the digital recorder, you are 
recommended  to  use  USB  cable  as  illustrated  below  to  prevent  recognition  error  of  digital  recorder  due  to  different 
start-up times among HDDs.
 
Furthermore,  before  you  start  operation  or  when  the  power  restores  from  a  power  failure,  check  that  the  HDDs  are 
recognized correctly even when a small number of HDD extension units are connected.
IN
OUT
IN
IN
IN
OUT
IN
IN
OUT
IN
This unit
This unit
This unit
This unit
This unit
This unit
This unit
OUT
IN
This unit
OUT
IN
This unit
OUT
IN
This unit
This unit
This unit
OUT
IN
This unit
OUT
IN
This unit
OUT
IN
OUT
IN
Digital recorder
* When 2 serial bus ports are used.
• 
The  EXTERNAL  CONTROL  switch  is  set  to  ON  by  default.  In  this  status,  this  unit  does  not  work  even  though  you 
connet the power cord and set the MAIN switch to ON.
 
Connect this unit and the recorder as “Connection to link the power supply of the recorder and this unit” on 
 page 
10.
Tips
 
• 
The available number of HDD extension units to be connected varies depending on the recorder connected. Check the 
specification of the recorder.
• 
You cannot connect 6 or more HDD extension units in series using serial bus.
• 
The  number  of  serial  bus  ports  varies  depending  on  the  digital  recorder  connected.  For  stable  recording,  it  is 
recommended to use the ports of the recorder as many as possible to avoid branch connection of the extension units.