6 parallel interface description and timing – Measurement Computing Parallel488 User Manual
Page 31
Section 4
IEEE to Parallel Operation
4.7
4.6 Parallel Interface Description and Timing
As an IEEE to parallel converter, the Parallel488 controls the following signals
(designated as out in the following table) and responds to the signals (designated as in).
Pin
Signal
Direction
Description
1
STROBE
out
After presenting a new character on the
parallel data lines (>1µs), this line is pulsed
low for >0.5 µs.
2
DATA0
out
Least significant data bit 0 (high=logic "1")
3
DATA1
out
Data bit 1
4
DATA2
out
Data bit 2
5
DATA3
out
Data bit 3
6
DATA4
out
Data bit 4
7
DATA5
out
Data bit 5
8
DATA6
out
Data bit 6
9
DATA7
out
Most significant data bit 7
10
ACKNLG
in
Low input indicates the parallel device has
accepted the character.
11
BUSY
in
Low input indicates the parallel device is
ready to accept a new character. The
Parallel488 will not output a character
until this line is low.
12
PE
in
Out of Paper signal. Not used.
13
SLCT
in
Printer Select signal. Not used.
14
/AUTO FEED
out
Always high.
16
Logic GND
Signal return.
19-30
Logic GND
Signal return.