Datalogic STAR Modem User Manual
Also see for Star: Brochure & specsQuick referenceDevice Set Up
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STARModem™4422.2.2 ACK/NACK ProtocolThis parameter sets a transmission protocol which takes place betweenSTARModem™ (Server) and Local Host in RS232. An RF device (such as a hand-held reader) passes its data (code read) to the modem which sends it to the Host.The Host sends an ACK character (06 HEX) to the modem in the case of goodreception; a NACK character (15 HEX) requesting re-transmission is sent to themodem in case of bad reception.In the particular case where the RF device is configured for 2 way transmission andtherefore requires an answer, it is advised to set STARModem™ with theDATA/NACK protocol. The DATA answer from the Local Host is implicitly consideredan ACK and is sent to the RF device. If instead ACK/NACK is used, the modemgenerates an Empty Answer to the RF device.CAUTIONBefore selecting this parameter ensure that “ACK/NACK fromRemote Host” is disabled (see par. 2.5.5).ACK/NACK DisabledACK/NACK EnabledDATA/NACK EnableddatadataServerdatadataACK or NACKServerdatadataDATA or NACKServer |
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