Argox AR-3000 Scan Utility - Manual (Page 6)

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None - Communication only uses T×D and R×D signals without regard for any hardware or software
handshaking protocol.
RTS/CTS - If the scanner wants to send the barcode data to a host computer, it will issue the RTS signal first, wait
for the CTS signal from the host computer, and then perform normal data communication. If there is no CTS signal
reply from the host computer after the timeout (Response Delay) duration, the scanner will issue 5 warning beeps.
Xon/Xoff - When the host computer is unable to accept data, it sends an Xoff code to inform the scanner to
suspend data transmission, and Xon to continue.
ACK/NAK- When the ACK/NAK protocol is used, the scanner waits for an ACK (acknowledge) or (not acknowledge)
from the host computer after data transmission, and will resend in response to a NAK.
Inter-character delay: This is the delay time between data character ’s data output. It is also the same as the
Inter-char. delay of the keyboard wedge.
Block transmission delay: This is the delay time between barcode data output. It is also the same as the Block
transmission delay of the keyboard wedge.
Response delay: This delay is used for serial communication of the scanner to wait for handshaking
acknowledgment from the host computer.