TaoTronics TT-BS009 - Manual (Page 25)

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RTS/CTS Option 3: When Option 3 is selected, the scanner asserts RTS
prior to any data transmission, regardless of the state of CTS. The scanner
waits up to Host Serial Response Time-out for CTS to be asserted. If CTS
is not asserted during this time, the scanner issues an error indication and
discards the data. The scanner de-asserts RTS when transmission is
complete.
RTS/CTS Option 3
ACK/NAK: When this option is selected, after transmitting data, the scanner
expects either an ACK or NAK 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 NAKs
are received, the scanner issues an error indication and discards the data.
ACK/NCK
ENQ: When this option is selected, the scanner waits for an ENQ character
from the host before transmitting data. If an ENQ is not received within the
Host Serial Response Time-out, the scanner issues an error indication and
discards the data. The host must transmit an ENQ character at least every
Host Serial Response Time-out to prevent transmission errors.
ENQ