User manual

GRYPHON™ BT CORDLESS READING SYSTEMS
150
♦ Only Good Reception: only the second beep indicating a good reception is
signaled.
♦ Off: Neither good read nor good reception beeps are signaled.
For all configurations, any transmission errors will always be signaled.
5.8 RADIO PARAMETERS FOR BT DEVICE CONFIGURATIONS
5.8.1 ACK/NACK Protocol and Frame Packing
ACK/NACK Protocol
The transmission protocol takes place between the reader and the Host. The reader
passes its data (code read) to the remote Bluetooth
®
device (Host).
In the following descriptions the completed transmission is indicated by the Beeper
Control for Radio Response parameter with its default setting to "Good Decode and
Good Reception" beep, see par. 5.7.4.
When ACK/NACK is disabled, there is no control from reader to Host transmission,
therefore the reader responds only with the good read tone.
Host with Bluetooth
®
device
GRYPHON
™
BT
data
only good read beep
ACK/NACK disabled
Host with
Bluetooth
®
device
NACK
data
GRYPHON
™
BT
data
good read
+ good RX
beep
ACK
ACK/NACK enabled
When ACK/NACK is enabled, 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. Only after the ACK character is received by Gryphon™ BT
does the reader respond with the good reception tone.
If the reader does not receive an ACK or NACK, transmission is ended after the
Radio Protocol Timeout, par. 5.7.1, or retried if transmission re
try is enabled, par.
5.7.2.