11.10 Specifications
Data communications: Asynchronous handshaking
Handshaking
Logic Level
Connector:
By STROBE pulse (from computer), ACKNLG pulse and
Busy signal (from interface card)
TTL level (compatible with CENTRONICS® 8 bit parallel)
AMPHENOL 57-30360 or equivalent
11.11 Connector Pin Assignment
Signal
Return
Pin No.
Pin No.
Signal
Direction
Description
1
1 9
STROBE
In
STROBE pulse for reading data in with
min. width of 0.5µs at receiving
terminal.
2
20
DATA 1
In
These signals give the 1st to the
3
21
DATA 2
In
8th bits of parallel data to the printer.
4
22
DATA 3
In
They must be stable for 0.5µs before,
5
23
DATA 4
In
after and during the STROBE pulse.
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. 1 0µs handshaking pulse that
tells the host computer that the printer
has received data.
1 1
BUSY
Out
Handshaking signal that tells the host
computer whether or not printer is
busy. Data can be received when this
signal is low, but cannot be received
when the signal is high.
12
PE
Out
Paper empty warning-but tied to logic
low as this typewriter not equipped with
a paper empty sensor.
13
SLCT
Out
This signal is always high.
14
NC
-
Not used/not connected
15
NC
-
Not used/not connected
16
+ OV
-
Logic Ground Level
17
FG
-
Frame Ground (Chassis Ground)
18
+ 5V
Out
+ 5V power supply. Max 1 50mA
19-30
+ 0V
-
Logic Ground level
31
INIT
In
Printer is initialized and printer buffer is
cleared when this signal is low (min.
pulse width 50µs).
32
ERROR
Out
This signal is always high.
33-36
NC
-
Not used/not connected
-<>cf ,
.
...
ia
ler.
60
