Parallel Port
PSI BOX Reference
Chapter 4
Page 35
Centronics Cables.
When used as an output the Centronics port can drive a parallel
printer. A standard IBM PC parallel printer cable can be used to
connect the PSI BOX parallel port to the printer. When used as an
input the PSI BOX parallel port can receive data from the parallel
printer port of a computer. To drive the PSI BOX from the LPT1:
port of an IBM PC, make up a cable as follows. A simple straight
through cable with male-to-male 25 pin D connectors as shown in
figure 4-4 is all that is required. Since in the PSI BOX the PE line,
pin12, is pulled low and /ERROR line, pin 15 and the SELECT
line, pin 13 are pulled high the PSI BOX emulates a printer port
correctly.
Figure 4-3 The Centronics Output Port Pin Outs.
PIN SIGNAL DIRECTION
1 STROBE OUTPUT FROM PSI BOX
2 DATA 0 OUTPUT FROM PSI BOX
3 DATA 1 OUTPUT FROM PSI BOX
4 DATA 2 OUTPUT FROM PSI BOX
5 DATA 3 OUTPUT FROM PSI BOX
6 DATA 4 OUTPUT FROM PSI BOX
7 DATA 5 OUTPUT FROM PSI BOX
8 DATA 6 OUTPUT FROM PSI BOX
9 DATA 7 OUTPUT FROM PSI BOX
10 ACKNOWLEDGE INPUT TO PSI BOX
11 BUSY INPUT TO PSI BOX
12-17 NO CONNECTION
18-25 GROUND
