Black Box PS035A - Manual (Page 8)

PQ-6 PLUS (RO)
7
The Centronics parallel interface is a 25-pin, parallel byte interface. It has eight lines that carry their
respective binary bits in parallel. The transmission of these data bits is controlled by the computer-supplied
STROBE pulse. Handshaking (flow control) is achieved by asserting or deasserting either the ACKNLG or
BUSY signal from the printer.
Figure 2-1. Typical Application.
S/3X, AS/400 or remote controller
PQ-6 PLUS (RO)
Printer ASCII data serial
or parallel
Twinaxial
Serial EBCDIC
data and
commands
(1 MHz bit rate)