TaoTronics TT-BS009 - Manual (Page 26)

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ACK/NAK with ENQ: This combines the two previous options. For
re-transmissions of data, due to a NAK from the host, an additional ENQ is
not required. ACK/NCK with ENQ
XON/XOFF: An XOFF character turns the scanner transmission off until
the scanner receives an XON character. There are two situations for
XON/XOFF:
• XOFF is received before the scanner has data to send. When the scanner
has data to send, it waits up to Host Serial Response Time-out for an XON
character before transmission. If the XON is not received within this time,
the scanner issues an error indication and discards the data.
• XOFF is received during a transmission. Data transmission then stops after
sending the current byte. When the scanner receives an XON character, it
sends the rest of the data message. The scanner waits up to 30 seconds for
the XON
XON/XOFF
RTS Line State
Host: Low RTS （Default）
Host: High RTS &RH