Parallel Interface - Epson FX-80 Operation Manual

B. Parallel Interface
The FX-80/FX-100 includes as standard equipment a parallel interface, which is
described below.
(1) Specifications
(a) Synchronization:
(b) Handshaking:
(c) Logic level:
By externally supplied STROBE pulses.
By ACKNLG or BUSY signals.
Input data and all interface control
signals are compatible with the TTL level.
(2) Connector
Plug: 57-30360 (AMPHENOL)
It is recommended that interface cables be kept as short as possible.
(3) Connector pin assignment and descriptions of signals.
Connector pin assignment and descriptions of respective interface signals are
provided in Table B-l.
Table B-1 Connector Pin Assignment and Descriptions of Interface Signals
Signal
Return
Signal Direction
Description
Pin No.
Pin No.
1
19
STROBE
In
STROBE pulse to read data in. Pulse width
must be more than 0.5
f.ts
at receiving
terminal.
2 20 DATA 1 In These signals represent information of the
3
21 DATA 2 In
1st to 8th bits of parallel data. respectively.
Each signal is at "HIGH" level when data
4 22 DATA 3 In
is logical "1" and "LOW" when logical
"0".
5 23 DATA 4 In
6 24 DATA 5
In
7 25 DATA 6 In
8
26 DATA 7 In
9 27 DATA 8
In
10 28 ACKNLG Out
-Approx. 12
f.ts
pulse. "LOW" indicates
that data has been received and that the
printer is ready to accept other data.
11 29 BUSY Out A "HIGH" signal indicates that the printer
cannot receive data. The signal becomes
"HIGH" in the following cases:
1. During data entry
2. During printing operation
3. In OFF-LINE state
4. During printer error status
B-1