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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 scanner 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 scanner 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 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: 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 scanner to waiting for handshaking
acknowledgment from the host computer.
15