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Communications PcOS Series 150 Programmer's Guide
Parallel Port
Page 116 Rev G 12/14/99
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 STROBE Clock data to printer Host to Printer
Pin 2-9 D0 - D7 Data Host to Printer
Pin 10 ACK\ Printer accepted cata Printer to Host
Pin 11 BUSY Printer is busy Printer to Host
Pin 12 PE Paper out/status Printer to Host
Pin 13 SLCT Printer selected Printer to Host
Pin 14 AUTOFD Auto feed 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
Pin 18-25 GND Ground
Table 13 Parallel port pin-outs
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
Driver +2.4 V to +5 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