REFERENCES

5

 

5.1.2ACK/NACK Protocol

GRYPHON™ D Readers

This parameter sets a transmission protocol in which the Host responds to the reader after every code transmitted. 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.

GryphonD

data

cable

ACK or NACK

ACK/NACK enabled

Host

If the reader does not receive an ACK or NACK, transmission is ended after the RX Timeout (see par. 5.1.4).

Selection of the ACK/NACK protocol temporarily disables FIFO buffering see par. 5.1.3.

GRYPHON™ M Readers

The transmission protocol takes place between reader, cradle and Host. The reader passes its data (code read) to the cradle which sends it to the Host.

In the following descriptions the completed transmission is indicated by the Beeper Control for Radio Response parameter with its default setting to Normal, see par. 5.7.3.

When ACK/NACK is disabled, there is no control from cradle to Host transmission, the reader responds with the good reception tone.

GRYPHONM

data

 

 

data

 

OM-GRYPHON™

 

cable

 

 

 

 

 

 

 

 

 

 

good RX

beep

ACK/NACK disabled

Host

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Datalogic Scanning 90ACC1780 manual 2 ACK/NACK Protocol, Gryphon D Readers, Gryphon M Readers