Intermec 3440 User Manual page 304

3440 Bar Code Label Printer User's Manual
The table below shows printer status conditions in descending order of
priority, status response characters, and pin 11/20 states:
Printer Status
Buffer already full
Ribbon fault
No label stock
Buffer now full
Printhead hot
Offline (paused)
Label at strip pin
Skipping
Printing
Ready/Online
Note: Do not confuse the Buffer now full <DC3> status with the XON/XOFF
characters <DC1> and <DC3>.
When the printer returns Buffer now full (<DC3>) status, it accepts the
currently received message block. At this time, the printer can accept short
messages to allow parsing of immediate commands such as Reset (<DLE>)
or Cancel batch printing (<EM>). However, if the printer responds with a
<GS> to any message block, the buffer is already full and it discards the
entire message block.
XON/XOFF Protocol (Software and Hardware Flow
Control)
The XON/XOFF protocol stops the host from sending data when the printer
buffer fills up and starts the host again when the buffer empties. When you
select this protocol, you concurrently enable software and hardware flow
control. Software flow control uses the ASCII characters <DC1> (XON) and
<DC3> (XOFF) to start and stop the flow of data from the host to the
printer. Hardware flow control uses pin 11 or pin 20 (internally connected
together) on the printer's serial port to indicate "Ready" or "Busy" for data
flow control. As with Standard protocol, <STX> and <ETX> enclose data.
Status responses conform to the table above except that <DC2> is
substituted for <DC1> and <DC4> is substituted for <DC3>.
B-4
Character Pin 11/20
GS Busy
US Busy
EM Busy
DC3 Busy
SI Busy
DC3 Busy
FS Ready
DC1 Ready
DC1 Ready
DC1 Ready
FG 9pt Italic
FG 8pt Italic