Chapter 4 The Centronics Parallel Port; Introduction - Brainboxes PS-307 User Manual

Parallel Port
CENTRONICS
PARALLEL

Introduction.

___________ _
This chapter describes the Centronics parallel port on the
PSI BOX. The parallel port connector pin outs, the function of
the Centronics Output DIP switch and the Centronics LEDs, the
parallel port input and output handshake are all explained in
detail.
_________ Summary.
The Centronics Parallel port is an IBM PC printer
compatible port, it provides TTL logic level signals. The
connector has the same pin out as the IBM PC parallel port
LPT1: etc. A 25 way female D connector, with screw locks for
secure connections, is used. The port may be either an input or
an output. A front panel LED flashes whenever the Centronics
port sends a byte. A front panel LED flashes whenever the
Centronics port receives a byte.
The Centronics Parallel port is normally used to drive a
parallel printer. When used as an input it can receive the output
from a computers parallel printer port and so act as the input for
a parallel to RS232 or parallel to IEEE interface.
Chapter 4
CHAPTER 4
THE
PORT.
PSI BOX Reference
Page 31