User manual

REFERENCES
141
5.1.2 ACK/NACK Protocol
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 "Good Decode and
Good Reception" beep, see par. 5.7.4.
When ACK/NACK is disabled, there is no control from cradle to Host transmission,
the reader responds only with the good read tone.
Host
data
cable
GRYPHON
™
BT
data
only good read beep
OM-GRYPHON™ BT
ACK/NACK disabled
OM-GRYPHON™ BT
Host
GRYPHON™ BT
data
good read +
good RX
beep
data
NACK
ACK
data
cable
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 the OM-
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 RX
Timeout (see par. 5.1.3). See also Radio Protocol Timeout, par. 5.7.1.