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5
5.1.2 ACK/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.
Gryphon
D
Host
ACK or NACK
data
cable
ACK/NACK enabled
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.
Host
data
cable
GRYPHON
M
data
good RX
beep
OM-GRYPHON™
ACK/NACK disabled