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REFERENCES
5
5.1.2
ACK/NACK Protocol
DRAGON™ 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.
data
cable
DRAGON D
Host
ACK or NACK
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.
DRAGON™ 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. The
management of responses (from Host or cradle) depends on the Transmission Mode
parameter, see par. 5.8.3.
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.
5.8.4.
When ACK/NACK is disabled (in One-Way tx mode), there is no control from cradle
to Host transmission, the reader responds with the good reception tone.
Transmission Mode = One-Way
data
data
cable
DRAGON M
OM-DRAGON™
Host
good RX
beep
ACK/NACK disabled
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