Symbol DS6707 Product Reference Manual page 144

8 - 14 Symbol DS6707 Digital Imager Scanner Product Reference Guide
Software Handshaking (continued)
•
XON/XOFF: An XOFF character turns the digital imager scanner transmission off until the digital imager
scanner receives an XON character. There are two situations for XON/XOFF:
• The scanner receives an XOFF before it has data to send. When the digital imager scanner has data to
send, it waits up to Host Serial Response Time-out for an XON character before transmission. If it does
not receive the XON within this time, the digital imager scanner issues an error indication and discards the
data.
• The scanner receives an XOFF during a transmission. Data transmission then stops after sending the
current byte. When the digital imager scanner receives an XON character, it sends the rest of the data
message. The digital imager scanner waits indefinitely for the XON.
XON/XOFF
*
None
ENQ
ACK/NAK
ACK/NAK with ENQ