D-3
Appendix D: Interface Data
** The I-Prime signal at Pin 31 is activated by the menu item I-Prime: If you select
Invalid the signal will be ignored. With Buffer Print and receiving an I-Prime
signal, the printer will be reset after printing the content of the printer buffer. On
Buffer Clear the printer will be reset at once and the contents of the printer buffer
will be deleted.
Low level: 0,0 V to +0,8 V
High level: +2,4 V to +5,0 V
Input circuit of DATA STROBE and I - PRIME line.
Signal R1 R2 C
DATA STROBE 1 kΩ 33 Ω 560 pF
I - PRIME 3,3 kΩ 33 Ω 0,001 µF
Parallel Data line 1 to 8 (Pin 2 to 9)
Input Circuit Output Circuit
+ 5 V
R = 4,7 kΩ
+ 5 V
R = 3,3 kΩ
Signal level
C
+ 5 V
R1
R2
74LS374 or equivalent 7407 or equivalent
(open collector)
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