REFERENCES
123
4.1.2
ACK/NACK Protocol
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.
QuickScan
®
Mobile
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. 4.1.4).
When ACK/NACK protocol is enabled, FIFO must be disabled manually, see par.
4.1.3.
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.
4.7.3.
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
QuickScan
®
Mobile
data
good RX
beep
CRADLE
ACK/NACK disabled
CRADLE
Host
data
cable
NACK
ACK
data
QuickScan
®
Mobile
data
good RX
beep
ACK/NACK enabled
