SATO SG112 ex Programming Reference Manual page 512

2) Output signal
Item
Print
Print end
(PREND)
Paper end
Ribbon end
Machine error
Print
Print end
(PREND)
Paper end
Riboon end
Machine error
Print
Print end
(PREND)
Paper end
Ribbon end
Machine error
Print
Print end
(PREND)
Paper end
Ribbon end
Machine error
Output waveform
1
2
3
4
Head open
Paper end
1
2
3
4
Ribbon end Head open
1
2
3
4
Head open
1
2
3
4
st
1 label complete
Head close
Label change
Head close
Ribbon change
Head close
511
20ms