Seiko FB-900 - Manual (Page 167)

● Parallel interface
7-2 — 7. Interface specifications —
1~50 µ s 1 µ s
(MIN)
1 µ s
(MIN)
7~10 µ s
4~6 µ s 4~6 µ s
ATA 1~8
BUSY
TROBE
ACK
0 µ s
(MIN)
1 µ s
(MAX)
INITIAL
BUSY
ACK
50 µ s
(MAX)
50
µ
s(MIN)
4~6
µ
s
7~10 µ s
4~6
µ
s
Data Input
Initialization
Timing chart
+5V
2.2K Ω
To printer
(74LS04
or equivalent)
Input Terminal
• DATA1 ~ DATA8
• AUTO FEED
• SELECT IN
+5V
To printer
100 Ω
330pF
(74LS14
or equivalent)
• STROBE
2.2K Ω
• INITIAL
+5V
To printer
100 Ω
1000pF
(74LS14
or equivalent)
2.2K Ω
All signals are TTL-level signals.
HIGH LEVEL 2.4 ~ 5.0 V
LOW LEVEL 0 ~ 0.4 V
At the input terminals
of the printer
Input Terminal
Input Terminal
+5V
2.2K Ω
To printer
(7406,7407
or equivalent)
Output
Terminal
• BUSY
• ACK
• PE
• ERROR
• SELECT
Input/output conditions
Input Signals Output Signals