Communications
PcOS Series 90PLUS
Programmer's Guide
Parallel port
Page 136
Rev Q
11/07/05
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
STROBE
Clock data to printer
Host to printer
Pins 2 - 9
D0-D7
Data
Host to printer
Pin 10
ACK\
Printer accepted data
Printer to host
Pin 11
BUSY
Printer busy
Printer to host
Pin 12
PE
Paper out/status
Printer to host
Pin 13
SLCT
Printer selected
Printer to host
Pin 14
AUTO-FD
Autofeed paper
Host to printer
Pin 15
ERR\
Printer error
Printer to host
Pin 16
INIT\
Initialize the printer
Host to printer
Pin 17
SLIN
Select printer
Host to printer
Pins 18 - 25
GND
Ground
Table 21 Parallel port pin outs
8.2.7
Signal Levels
Voltage levels
0 V and +5 V (nominal)
Logic levels
Logic 1
Driver
+2.4 V to +5 V
Receiver
+2.0 V to +5 V
Logic 0
Driver
0 V to +0.4 V
Receiver
0 V to +0.8 V
Current requirements
Logic 1
Source 0.25 ma at +2.4 V
Logic 0
Sink 16 ma
Line termination
Data and control 3.3 K ohm to +5 V
Strobe
1.2 K ohm to +5 V
Summary of Contents for Ithaca 90PLUS Series
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