Intermec EasyCoder PM4i User Manual page 58

Chapter 6—Setting Up the Printer
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
Printhead raised
Ribbon fault
No label stock
Buffer now full
Printhead hot
Label at strip pin
Label skipping
Ready
Printing
46
Character
GS
US
US
EM
DC3
SI
FS
DC1
DC1
DC1
Intermec EasyCoder PM4i—User's Guide (IPL version)