Intermec EasyCoder F4 Installation & Operation Manual page 39

Chapter 6 Setting Up the Printer
Setup Parameters, cont.
Serial Communication,
cont.
38
Protocol, cont.
• Intermec Standard Protocol
The Intermec Printer Standard Protocol is a half-duplex protocol.
All data transmissions to the printer consist of status inquiry
(ENQ), status dump (VT), or message blocks. Each message
block starts with the Start of Text (STX) character and ends with
the End of Text (ETX) character. Each message block must be
255 characters or less, including the STX and ETX characters.
The printer responds to each status inquiry or message block
with the printer status. The host should check the printer
status before downloading a message block to the printer.
ENQ causes the printer to transmit its highest priority status,
while VT instructs the printer to transmit all status that applies
in the order of their priority. The possible printer status in
descending priorities are
Condition
Buffer already full
Ribbon fault
No label stock
Buffer now full
Printhead hot
Label at strip pin
Label skipping
Ready
Printing
• Hardware Protocol
This protocol is not controlled by any setup parameter. Hardware
fl ow control is achieved by pin 4 (RTS). RTS is held high if
the printer is ready to receive data. RTS goes low when the
input buffer is fi lled. Pin 20 (DTR) will be held high as long
as the printer is powered on.
Intermec EasyCoder F4 – Installation & Operation IPL Version, Ed. 1
Character
GS
US
EM
DC3
SI
FS
DC1
DC1
DC1