Intermec EasyCoder 4420, User Manual, Page: 130 / 156

4420 and 4440 Bar Code Label Printer User’s Manual
C-6
Hardware Protocol
The printer uses Ready/Busy and DTR (data terminal ready) of the RS-232C
interface to indicate the printer’s status. You can configure Ready/Busy and
DTR independent of each other and independent of the software protocol you
select for the serial port. You can set each pin to one of these three settings:
default, high, and Ready/Busy.
When you set the pin to high, the printer will be ready to accept data anytime.
When you set the pin to Ready/Busy, the pin is high when the printer status is
ready. The pin is held low when the printer is in one of these conditions:
•
Offline
•
Buffer full
•
No label stock
•
Ribbon fault
•
Label at strip pin
If you set the printer to XON/XOFF protocol, the XON and XOFF characters
will not be transmitted back to the host.
When you set the pin to default, it uses flow control if the serial port is set for
XON/XOFF protocol. If you are using Intermec Standard protocol, the printer
uses Ready/Busy.
User-Defined Protocol
The 4420 and 4440 printers provide the capability to change protocol characters.
However, you cannot define your own protocol. You can substitute characters
to use as protocol characters, but the rules for the chosen protocol do not
change. The printer does not use any protocol characters that you replace with
the NUL character. One table of protocol characters exists. You may redefine
these characters to create a table that all of the protocols can use. One
possibility for you to redefine protocol characters may be the replacement of
control characters with printable characters.
Note: Please use caution when replacing control characters with printable characters.
One control character can be replaced with only one printable character.