Parallel Port Connector; Signal Levels; Table 13 Parallel Port Pin-Outs - Ithaca 150 Programmer's Manual

Communications
Parallel Port

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 personal computer parallel printer interface with a one to one cable.
The INIT\ (initialize) printer input acts as a hardware reset to the printer. This signal must be
inactive (high) for about four seconds before the printer will respond to information input.
The paper error signal is asserted by the printer whenever the journal paper is exhausted and an
attempt is made to print on the journal. The paper error signal is also asserted in response to
inquire (ENQ) commands in parallel, non-IEEE 1284 mode.
The ERR\ signal is asserted if a head jam occurs or if the paper error signal is asserted for a true
paper error. Note: The AUTOFD (auto feed, Pin 14) and SLIN (Select input, Pin 17) signals are
not used by the Series 150 Printer in parallel, non-IEEE 1284 mode.
Pin 1
Pin 2-9
Pin 10
Pin 11
Pin 12
Pin 13
Pin 14
Pin 15
Pin 16
Pin 17
Pin 18-25

Table 13 Parallel port pin-outs

Signal Levels

Voltage levels
Logic levels
Logic 1
Driver
Receiver
Logic 0
Driver
Receiver
Driver
Current requirements
Logic 1
Logic 0
Line termination
Data and control
Strobe
Page 116
PcOS Series 150
STROBE Clock data to printer
D0 - D7 Data
ACK\ Printer accepted cata
BUSY Printer is busy
PE Paper out/status
SLCT Printer selected
AUTOFD Auto feed 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
+2.4 V to +5 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 G
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
12/14/99