Datalogic Scanning 90ACC1780 Manuel D’Utilisation

GRYPHON™ 

data 

NACK 

ACK 

data 







 M 

data 

good RX 

beep 

 

 
When ACK/NACK is enabled, the Host sends an ACK character (06 HEX) in the 
case of good reception or the NACK character (15 HEX) requesting re-transmission, 
in the case of bad reception. Only after the ACK character is received by the OM-
GRYPHON™ does the reader respond with the good reception tone. 
 
If the reader does not receive an ACK or NACK, transmission is ended after the RX 
Timeout (see par. 5.1.4). See also Radio Protocol Timeout, par. 5.7.1 for M-Series 
readers. 
 
Selection of the ACK/NACK protocol temporarily disables FIFO buffering see par. 
5.1.3. 
 
 

 
GRYPHON™ D Readers 
This parameter determines whether data (barcodes) are buffered on a First In First 
Out basis allowing faster data collection in certain cases for example when using 
slow baud rates and/or hardware handshaking. 
 
If the FIFO buffering is enabled, codes are collected and sent out on the serial line in 
the order of acquisition. About 800 characters can be collected (buffer full), after 
which the reader signals an error and discards any further codes until the 
transmission is restored. 
 
If the FIFO buffering is disabled, each code must be transmitted before another one 
can be read. 
 
 
GRYPHON™ M Readers 
If enabled, the OM-GRYPHON™ collects all messages sent by GRYPHON™ M and 
sends them in order of acquisition to the connected Host. 
 
If disabled, GRYPHON™ M blocks message transmission until the OM-GRYPHON™ 
has completed transmission towards the Host.