Datalogic Scanning DLCC 4.2.2 ACK/NACK Protocol

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

A

CK or NACK

ACK/NACK Enabled

Data

Server

DATA or NACK

DATA/NACK Enabled

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Contents

Main Page CONTENTS Page REFERENCES CONVENTIONS REFERENCE DOCUMENTATION SERVICES AND SUPPORT COMPLIANCE N2468 WEEE COMPLIANCE Page QUICK START Page Page CONFIGURATION METHODS Page Page 1 INTRODUCTION 1.1 OVERVIEW 1.2 LED INDICATOR 2 INITIAL SETUP 2.1 CONFIGURATION STRINGS 2.2 DLCC SETUP RESTORE DEFAULT 1. SET RADIO ADDRESSES 2. 3. 4. 5. 3 CONFIGURATION COM PORT PARAMETERS AUD ATE ITS TOP ITS ANDSHAKING ACKING RAME F IMEOUT RX T ELAY HARACTER ROTOCOL ACK/NACK P DATA FORMAT EADER ERMINATOR EADER ELIMITER DDRESS A TAMPING DDRESS A ENGTH RADIO PARAMETERS RF B (Client only) TORE INGLE ACK/NACK F (Client only) EACON OST EMOTE 4 PARAMETER ISSUES AND DEFINITIONS 4.1 RADIO AND SERIAL COMMUNICATION CONTROLS Page Page Page 4.2 COM PORT PARAMETERS 4.2.1 Handshaking Page 4.2.2 ACK/NACK Protocol 4.2.3 RX Timeout 4.2.4 FIFO 4.2.5 Frame Packing Frame+ [CR] (default): the frame sent to DLCC is terminated by [CR]. This 4.3 DATA FORMAT 4.3.1 Header/Terminator Selection 4.3.2 Address Stamping 4.3.3 Address Delimiter 4.4 RADIO PARAMETERS 4.4.1 RF Baud Rate 4.4.2 Transmission Mode (Client only) 4.4.3 Radio Protocol Timeout (Client only) 4.4.5 ACK/NACK From Remote Host (Client only) 4.4.6 Beacon (Client only) 5 DEFAULT CONFIGURATION 6 TECHNICAL FEATURES A TYPICAL SYSTEM LAYOUTS A.1 DLCC SERVER A.2 BI-DIRECTIONAL COMMUNICATION B B HEX AND NUMERIC TABLE GLOSSARY INDEX Datalogic Mobile S.r.l. Via S. Vitalino 13 40012 - Lippo di Calderara Bologna - Italy 2001 EN 60950-1, D 2004