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The Pcrralfel Interface
251
Table F-l
Padel
interface pin functions
Signal
Name
Direction
1
STROBE
IN
Si nals when data is ready to be read. Sig-
n 3 goes from HIGH to LOW (for at least 0.5
microseconds)
when data is available.
2
DATA1
IN
These signals provide the information
of
the first to eighth bits of parallel data. Each
signal is at a HIGH level for a logical 1 and
a LOW level for a logical 0.
9
DATA8
IN
10
XX
OUT
A 9 microsecond
LOW pulse acknowledges
receipt of data.
11
BUSY
OUT
When this signal goes LOW the printer is
readv to accent data.
12
PAPER OUT OUT
normally
LOW. It will go
runs out of paper. This sig
nal can be held LOW
ermanently by turn-
ine DIP switch C-l o P .
I
I
I
13
SELECTED
OUT
':
This signal is HIGH when the printer is on-
line.
1415 IN/C
16
1 SIGNAL
1
[ Unused.
1 Signal ground.
GND
17
CHASSIS
GND
18
+ 5VDC
OUT
19-30
GND
31
RESET
IN
32
ERROR
OUT
33
EXT GND
Printer's
chassis
ground,
isolated
from
logic ground.
External supply of + BVDC.
Twisted pair return signal ground level.
When this signal goes LOW the printer is
reset to its power-on condition.
This signal is normally HIGH. This signal
goes LOW to signal that the printer cannoi
print due to an error condition.
External around.
34-36
1
N/C
1 Unused.
Pin II reports when the Radix is not able to receive data. The
_
__
signal is called BUSY. When this signal is high, Radix cannot
receive data. This signal will be high during data transfer, when
the printer is off-line and when an error condition exists.
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