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Datalogic Heron Software Configuration Manual - The Barcode ...

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REFERENCES<br />

4<br />

4 REFERENCES<br />

4.1 USB-COM AND RS232 PARAMETERS<br />

4.1.1 Handshaking<br />

Hardware handshaking: (RTS/CTS)<br />

<strong>The</strong> RTS line is activated by the decoder before transmitting a character.<br />

Transmission is possible only if the CTS line (controlled by the Host) is active.<br />

Signals at<br />

EIA levels<br />

RTS<br />

TX<br />

Transmitted data<br />

Transmitted data<br />

CTS<br />

Host busy<br />

RTS/CTS handshaking<br />

<strong>Software</strong> handshaking: (XON/XOFF)<br />

During transmission, if the Host sends the XOFF character (13 Hex), the decoder<br />

interrupts the transmission with a maximum delay of one character and only resumes<br />

when the XON character (11 Hex) is received.<br />

Transmitted data<br />

Transmitted data<br />

TX<br />

RX<br />

XOFF<br />

Host busy<br />

XON<br />

Host ready<br />

XON/XOFF handshaking<br />

107

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