DL CORDLESS CARD™
4
4.2.2 ACK/NACK
Protocol
This parameter sets a transmission protocol which takes place between DLCC
(Server) and an RF device. An RF device (such as a hand-held reader) passes its
data (code read) to the card installed into the terminal. The Host sends an ACK
character (06 HEX) to the card in the case of good reception; a NACK character (15
HEX) requesting re-transmission is sent to the card in case of bad reception.
In the particular case where the RF device is configured for 2 way transmission and
therefore requires an answer, it is advised to set DLCC with the DATA/NACK
protocol. The DATA answer from the Local Host is implicitly considered an ACK and
is sent to the RF device. If instead ACK/NACK is used, the card generates an Empty
Answer to the RF device.
CAUTION
Before selecting this parameter ensure that “ACK/NACK from
Remote Host” is disabled (see par. 4.4.5).
Data
Server
ACK/NACK Disabled
Data
Server
ACK or NACK
ACK/NACK Enabled
Data
Server
DATA or NACK
DATA/NACK Enabled
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Summary of Contents for DL Cordless Card DLCC
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