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POWERSCAN
®
D8330/M8300
140
5.1.2 ACK/NACK Protocol
PowerScan
®
D8330 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.
PowerScan
®
D8330 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).
When ACK/NACK protocol is enabled, FIFO must be disabled manually, see par.
5.1.3.
Pow
erScan
®
M8300 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. 5.9.4.
In the follo
wing descriptions the completed transmission is indicated by the Beeper
Control for Radio Response parameter with its default setting to Normal, see par.
5.9.5.
When ACK/NA
CK is disabled (in One-Way tx mode), there is no control from cradle
to Host transmission, the reader responds with the good reception tone.
BC-80X0
Host
data
cable
PowerScan
®
M8300
data
Transmission Mode = One
-
Way
good RX
beep
ACK/NACK disabled