Pfaff 3819 series Instruction Manual page 19

 Piece counter
0 00
This key is used to set the piece counter to zero.
Coded via parameters 811 and 812.
 Puller on/off
 Cutting puller on/off
 Free
 Raise/lower presser foot
This is raised if the presser foot is lowered and lowered if the presser foot is raised.
Coded via parameter 813.
 Free.
 Free sewing
You can sew with treadle control and the machine does not react to a photo cell.
This key corresponds to number 0 when entering the code number.
Operating Controls
19