Parallel Port Connector; Signal Levels; Table 21 Parallel Port Pin Outs - TransAct Ithaca 90PLUS Series Programmer's Manual

Communications
Parallel port
8.2.6

Parallel Port Connector

The parallel printer interface is a 25-pin D-shell connector. The pin out is such that the printer will interface
to a standard IBM PC parallel printer interface with a one to one cable.
The initialize (INIT\) printer input acts as a software reset to the printer. This signal must be inactive (high)
for about one second before the printer will respond to information input.
The printer asserts the paper error signal whenever the journal paper is exhausted. The paper error signal is
also asserted in response to inquire commands in parallel, non-IEEE 1284 mode.
The error (ERR\) signal is asserted if a head jam occurs or if the paper error signal is expressed for a true
paper error. Note: the autofeed (auto-FD, Pin 14) and select input (SLIN, Pin 17) signals are not used by the
Series 90PLUS Printer in parallel, non-IEEE 1284 mode.
Pin 1
Pins 2 - 9
Pin 10
Pin 11
Pin 12
Pin 13
Pin 14
Pin 15
Pin 16
Pin 17
Pins 18 - 25

Table 21 Parallel port pin outs

8.2.7

Signal Levels

Voltage levels
Logic levels
Logic 1
Driver
Receiver
Logic 0
Driver
Receiver
Current requirements
Logic 1
Logic 0
Line termination
Data and control
Strobe
Page 136
PcOS Series 90PLUS
STROBE Clock data to printer
D0-D7 Data
ACK\ Printer accepted data
BUSY Printer busy
PE Paper out/status
SLCT Printer selected
AUTO-FD Autofeed paper
ERR\ Printer error
INIT\ Initialize the printer
SLIN Select printer
GND Ground
0 V and +5 V (nominal)
+2.4 V to +5 V
+2.0 V to +5 V
0 V to +0.4 V
0 V to +0.8 V
Source 0.25 ma at +2.4 V
Sink 16 ma
3.3 K ohm to +5 V
1.2 K ohm to +5 V
Rev Q
Programmer's Guide
Host to printer
Host to printer
Printer to host
Printer to host
Printer to host
Printer to host
Host to printer
Printer to host
Host to printer
Host to printer
11/07/05