
Configuring the Printer 2-15
Defining the Backfeed Control Packet
Use the backfeed control packet (G) to enable or disable the backfeed option, set the dispense
position and the backfeed distance. Backfeed works by advancing each printed label to the
desired dispense position. Once that label is removed, the next label to be printed is backed
up underneath the printhead. In continuous mode, only the last label in the batch is advanced
to the dispense position. You may need to adjust the dispense position to allow labels to be
removed, die cut labels to be removed easily, or to prevent them from falling off.
Extended backfeed is available on the 9855 printer with a knife installed. Extended backfeed
feeds a tag far enough out to be cut and backfeeds the next tag to the printhead line. You can
not change the backfeed distance while the printer is active.
Extended backfeed eliminates printed tags being left between the printhead and knife.
Extended backfeed does not work with non-indexed (continuous) supply/mode. We do not
recommend using extended backfeed when sensing on attacher-hole supplies.
Do not use backfeed (normal or extended) with supplies less than 0.75 inches. We
recommend using 0.5-inch gap supplies in peel mode when backfeed is disabled.
The dispense position and backfeed distance are optional parameters and do not have to be
specified. However, they allow for greater precision when positioning the supply.
Syntax {I,G,action,dis_pos,bkfd_dis | }
G1. G Backfeed Control Packet
G2. action Action. If using one-inch RFID supplies, do not use backfeed. Options:
0 disable backfeed (default)
1 enable backfeed (use on any printer without a knife)
2 enable extended backfeed (use on any printer with a knife)
Note: We do not recommend setting a positive cut position for any supply while
using extended backfeed. You may cut off the leading edge of the next tag.
G3. dis_pos Dispense Position. Adjusts the stopping point of the label. Range: 50 to 200 dots
(default 65 dots).
G4. bkfd_dis Backfeed Distance. Amount to move label backwards. 20 to 200 dots (default 65
dots). This distance can not be greater than the dispense position.
The backfeed distance should equal the dispense position. An exception is if you
are tearing instead of peeling. Then, the backfeed distance must be 30 dots
(.150 inches) less than the dispense position. However, you will have a 30 dot
non-print zone on your supply. The 30-dot difference accounts for improper tearing
of butt cut supplies, because you do not want any exposed adhesive under the
printhead.
Example {I,G,2 | }
Enables extended backfeed and cuts any tags remaining between the knife and printhead and
moves the supply backwards so the next tag is underneath the printhead. Using cut mode 4,
you do not have to press FEED/CUT to cut the last tag.
Example {I,G,1,50,20 | }
Enables backfeed and sets the dispense position to 0.25 inches (50/203) and the backfeed
distance to 0.10 inches (20/203).
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