Argox AS-8020CL - Manual (Page 53)

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RS-232
CTS: Clear To Send (Hardware Signal)
RTS: Request To Send (Hardware Signal)
Xon: Transmit On (ASCII Code 11 16 )
Xoff: Transmit Off (ASCII Code13 16 )
Flow control:
None-The communication only uses TxD and RxD signals
without regard for any hardware or software handshaking
protocol.
RTS/CTS-If the cradle wants to send the barcode data to
host computer, it will issue the RTS signal first, wait for the
CTS signal from the host computer, and then perform the
normal data communication. If there is no replied CTS signal
from the host computer after the timeout (Response Delay)
duration, the imager will issue a 5 warning beeps.
Xon/Xoff- When the host computer is unable to accept data,
it sends a Xoff code to inform the cradle to suspend data
transmission, and Xon to continue.
ACK/NAK- When the ACK/NAK protocol is used, the cradle
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: It is delay time between data
character’s data output. It is also same as Inter-char. delay of
keyboard wedge.
Block transmission delay: It is a delay time between
barcode data output. It is also same as Block transmission
delay of keyboard wedge.
Response delay: This delay is used for serial
communication of the cradle to waiting for handshaking
acknowledgment from the host computer.