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Intermec EasyCoder F4 – Installation & Operation IPL Version, Ed. 336
Chapter 6 Setting Up the Printer
Setup Parameters, cont.
Serial Communication,
cont.
Protocol
• XON/XOFF (default)
In the XON/XOFF protocol, data fl ow control is achieved by
using XON (DC1) and XOFF (DC3) characters. Message blocks
are not required to be bracketed by the Start of Text (STX) and
End of Text (ETX) characters. However, at power up or after a reset
all characters except ENQ or VT will be ignored until an STX is
detected. The message length in this protocol is unrestricted. That
is, the printer processes information as it is being downloaded and
stops when there is no more information.
XON/XOFF protocol conforms to generally accepted industry
standards. No end-of-message response is sent to the host other
than XOFF. An XON will be sent on power up.
Since DC1 and DC3 are used for data fl ow control, the printer status
characters are different than those of the Standard Protocol. If the
host ignores the printer’s XOFF, the printer will resend an XOFF
after receiving every 15 characters from the host.
Condition Character
Buffer already full GS
Printhead raised US
Ribbon fault US
No label stock EM
Buffer now full DC4
Printhead hot SI
Label at strip pin FS
Label skipping DC2
Printing DC2