Datalogic Scanning DL Cordless Card DLCC - Manual (Page 30)

DL CORDLESS CARD™
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Case 1 – DLCC as Server
DRAGON 1
DLCC
HOST
DRAGON 2
DRAGON 3
F734-E
Figure 5 –DLCC as Server
DLCC as a Server receives data from RF devices. The ACK/NACK Protocol
parameter can be set to assure correct communication between DLCC and the local
Host.
Assuming the RF devices are setup for 2 way transmission in STAR-System™ mode
we can analyze the following ACK/NACK protocol selections:
RF devices - Transmission Mode = 2 ways
The Host must respond to a 2 way transmission
• If DLCC - ACK/NACK = disabled
there is no control of the communication between DLCC and the Local Host.
DLCC answers the RF device which initiated the 2 way transaction with DATA
received from the Local Host.
• If DLCC - ACK/NACK = enabled
when the Local Host receives a message correctly, it answers DLCC with the
ACK character. Only then does DLCC acknowledge the RF device which
initiated the 2 way transaction with an Empty Answer.
• DLCC - DATA/NACK = enabled
when the Local Host receives a message correctly, it answers DLCC with DATA.
DLCC then answers the RF device which initiated the 2 way transaction with this
DATA (i.e. command to RF device display).
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