Datalogic-scanning DL Cordless Card DLCC Manuel d'utilisateur télécharger pdf (Page 30)

DL CORDLESS CARD™

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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Datalogic-scanning DL Cordless Card DLCC Manuel d'utilisateur Page 30