Ack/Nak Protocol; Xon/Xoff Protocol; Rts/Cts Protocol - Metrologic IS1000 Series Configuration Manual

Radio frequency bar code reader

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2.1.7. ACK/NAK Protocol

Once this protocol is activated, the decoder waits for an acknowledgment from the

host system:

• ACK (06 hexa) means: message correctly received by the host system.

• NAK (15 hexa) means: message incorrectly received by the host, upon

ACK/NAK DISACTIVATED *

Using this protocol, the host system can control the data flow coming from the

decoder:

• XON (11 hexa) means: host system ready to receive data.

• XOFF (13 hexa) means: host system busy, the decoder stops the transmission

XON/XOFF DISACTIVATED *

This protocol is a hardware "handshake" between the decoder and the host

system. Before transmitting data, the decoder rises its RTS signal (pin 4) to +10

volt and waits for a +10 volt signal on its CTS (pin 5) from the host. The rest

position of the two pins is -10 volt.

RTS/CTS PROTOCOL DISACTIVATED *

START OF CONFIGURATION

IS1000 – Configuration Guide

reception of this character the decoder resends the

message.

and waits for an XON.

XON/XOFF ACTIVATED

RTS/CTS PROTOCOL ACTIVATED

ACK/NAK ACTIVATED

END OF CONFIGURATION

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