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GENERAL SPECIFICATIONS
4.
Parallel Interface
4-1. General Specifications
Item
Interface
Synchronization System
I/F Protocol
Logic Level
STROBE
(EDS B-6 : ON)
STROBE
(EDS B-6 : OFF)
4-2. Connector Signals
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SIGNAL GND
17
18
19~30
31
32
33
34~35
36
SELECT IN
ACK
5µs
5µs
Data
BUSY
Fig. 1-6 Timing Charts for Parallel Interface
Name
Goes low for ≥ 0.5µs when active.
STROBE
These signals represent information for the 1st through 8th bit of
DATA0
parallel data, respectively. Each signal is HIGH when data is logical 1,
DATA1
and LOW when logical 0.
DATA2
DATA3
DATA4
DATA5
DATA6
DATA7
ACK
10µs low to acknowledge receipt of data.
BUSY
Printer sets line low when ready to receive data.
PAPER
High when paper runs out.
SELECT
High when printer is on-line.
AFXT
Printer ignores this signal.
Signal ground
CHASSIS
Chassis ground (isolated from signal ground)
+5V
+5V DC output from printer
GND
Twisted pair ground return
RESET
Printer is reset when this signal goes low.
ERROR
Low when printing cannot continue due to error.
EXT GND
External ground
Printer ignores this signal.
Specifications
Centronics-compatible
Via externally supplied STROBE pulse
Using ACK and BUSY signals
Compatible with TTL level
t
t
t
t : More than 0.5µs
Not used.
Not used
– 10 –
t
Function
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