Star Micronics 150 manual Parallel Port Connector, Signal Levels

Communications PcOS Series 150 Programmer's Guide

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	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

Page 116 Rev G 12/14/99