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Stand Alone Printing
5/22/2012 GC420t™ User Guide P1052686-001
Stand Alone Printing
Your printer can be configured to work without being attached to a computer. The printer has
the ability to automatically run a single label form. One or more downloaded label forms can
be accessed and run with a terminal or wedge device or a Zebra
®
KDU (keyboard display unit)
to call a label form. These methods allow the developer to incorporate data input devices, such
as scanners or weight scales, to the printer via the serial port.
Label formats can be developed and stored in the printer to support labels that have:
• No data entry required and print when the Feed button is pressed.
• No data entry required and print when a label is removed from the printer’s optional label
dispenser.
• One or more data variables to be entered via the terminal or wedge device. The label will
print after the last variable data field has been input.
• One or more label formats that are called by scanning bar codes containing programming
to run a label form.
• Label forms designed to work as a process chain with each label including a bar code
containing the programming to run the next label in the process sequence.
Both printer programming languages support special label forms that will automatically run
after a power cycle or reset. The ZPL looks for a file named AUTOEXEC.ZPL and EPL
looks for a label form named AUTOFR. If both files are loaded in the GC420 printer, then
only the AUTOEXEC.ZPL will run. The EPL AUTOFR form runs until it is disabled. Both
files must be deleted from the printer followed by a reset or a power cycle to completely
remove the files.
The printer can source up to 750mA through a 5 volt line shared between the parallel and serial
ports. See Appendix A for more information on the printer’s serial port interface.
Note • The GC420 EPL AUTOFR command can only be disabled with NULL character (00 hex
or ASCII 0). The printer will ignore the other character that normally disables the AUTOFFR
form operation in most other EPL printers, the XOFF character (13 hex or ASCII 19).