Posiflex LS-1000 - Manual (Page 75)

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OMNIDIRECTIONAL SCANNER PROGRAMMING GUIDE
5. Handshaking Protocol
The RS-232C type scanner supports four handshaking protocols.
With these options of communication protocol, users can tailor the
scanner to meet the requirement of most systems. These
handshaking protocols are:
*None
The scanner will transmit any read data unconditionally. The
scanner will not check the receiving device or the transmitted
message.
*RTS/CTS
Under this handshaking protocol, the scanner use the RTS pin to
instruct the connected device to transmit data and test the CTS pin
for readiness of the connected device to receive data.
*ACK/NAK
The scanner waits for an ACK or NAK signal from the host
computer after each data transmission. Normally, the scanner will
temporarily stored the scanned data in the memory buffer before
receiving the ACK or NAK signal. If the ACK signal is received, it
will clear the transmitted data and continue to send the next data.
In case the NAK signal is received, it will repeat to transmit the
same data until receiving the ACK signal.
*Xon/Xoff
During the data communication, if a scanner receives an Xoff
(ASCII 013H), it will stop the transmission at once. The scanner
waits for a Xon (ASCII 01H) to start the transmission again.