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Beeper Indication for Scanner 
The MS840 uses beeps to give you audio feedback when it performs some 
functions. For example, you hear a beep each time you scan a valid barcode. 
Beep Sequence  What it means 
One long beep with a medium tone  Trigger is pressed to power on the scanner. 
One short beep with a Hi tone  1.  Successful barcode reading 
2.  Pin code setting (waiting to enter a pin code) 
One beep with a Hi tone  Successful pairing/connection/reconnection (Cradle mode) 
3 Hi-Low alarms  Disconnect (out of range) with 100ms delay from a high tone to a low 
tone or from a low tone to a high tone   
One long beep with a Hi tone  Successful connection 
One short beep with a Hi-Low-Hi tone in 
setting mode 
Entering barcode setting mode 
One short beep with a Hi-Medium tone  Exiting barcode setting mode 
2 short beeps with a Hi tone  Page calling 
One short beep with a medium tone  Successful in-range reading in batch mode 
One short beep with a medium tone  Buffer mode is disabled 
One short beep with a Low-Hi tone  Data to buffer (out of range) in batch mode and inventory mode 
One beep with a medium tone   
 one long beep with a medium tone 
Successful data transfer in batch mode and inventory mode 
4 short beeps with a Low-Hi tone   Out of range (buffer mode disabled / inventory mode / buffer mode 
when the memory buffer is full) 
Definition of batch mode 
In range: Scanner will transmit each scanned data right after scanning the barcode. 
Out range: Scanner is able to continue scanning and all scanned data are stored into the memory 
buffer. 
Out range  in range: Stored scanned data will be transmitted automatically right after the radio 
link is resumed. 
(* You will hear 3 hi-low long beeps indicating the radio connection lost) 
Definition of inventory mode 
In range/out range: All scanned barcode data will be stored in memory stroage. 
Transmit stored data: Scan the "Read Buffer" (change to "send data") to transmit all stored data.   
(* When the radio link is resumed, the scanner will give one long & hi beep after data transmission is 
completed. When the data can't transmit (radio link is lost), the scanner will give three short low-hi 
beeps.) 
Clear stored data: Scanner is preset to keep all stored data. You can clear all stored data by scan 
"Buffer Erasable" firstly and then scan "Erase Buffer" Change to "confirm Erase buffer". 
Definition of Buffer Disable 
In range: Scanner will transmit each scanned data right after scanning the barcode. 
Out range: Scanner is unable to scan and you will hear 3 short low-hi beeps. 
(* You will hear 3 hi-low long beeps indicating the radio connection lost.) 
LED Indication for Cradle 
The LED lights on the MS840 cradle turn on to indicate the status of the power and 
wireless connection.   
LED Light State  What it means 
Blue LED blink  Connection 
Blue LED on  Disconnection 
Green LED on  Power on 
Green LED off  Power off