11
3-2 RS-232 interface
Flow control:
None
-The communication only uses TXD and RXD signals without 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 duration,
the scanner will issue an error indication. By setting (Host idle: Low RTS or Host idle: High RTS), the
scanner can be set to match the Serial Host RTS line.
ACK/NAK
-After data transmitted, the scanner expects either an ACK (acknowledge) or NAK (not
acknowledge) response from the host. When a NAK is received, the scanner transmits the same
data again and waits for either an ACK or NAK. After three unsuccessful attempts to send data when
NAK are received, the scanner issues an error indication and discards the data.
Inter-character delay:
This delay is inserted after each data character transmitted.
Response delay
: This delay is used for serial communication of the scanner when it waits for a
handshaking acknowledgment from the host.
Host-character delay
: This delay is the time that the scanner waits for the host to send the next
character in serial communication, it is based on 1ms increments.
Data package
:
Disable
: The scanner sends the decoded data directly.
Enable
: The decoded data is sent in data package mode (see section “
”).
