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PORTER INSTALLATION AND OPERATIONS MANUAL

Appendix A – Porter Pin outs

Serial model

Signal Name

Abbrv.

I/O

Description

Transmit data

TXD

Output

Serial data from port

Receive data

RXD

Input

Serial data to port

Request to send

RTS

Output

Always high

Data set ready

DSR

Input

Low inhibits TXD data*

Signal ground

GND

Common

Ground reference

Data term. ready

DTR

output

Low should inhibit RXD

* Pin 6 has an internal pull-up to set it high (ready) when no signal is connected and

when no hardware flow control is required.

Parallel Model

Signal

Port 0

Port 1-8

Description

STROBE

Input

Output

Data transfer when pulsed low

Data 0

Input

Output

Data LSB

Data 1

Input

Output

Data 2

Input

Output

Data 3

Input

Output

Data 4

Input

Output

Data 5

Input

Output

Data 6

Input

Output

Data 7

Input

Output

Data MSB

ACK

Output

Input

Pulsed low for next data transfer

BUSY

Output

Input

When high inhibits flow of data

Output

Input

When high printer is out of paper

SELECT

Output

Input

General purpose signal

Input

Output

General purpose signal

Ground

Common

+5 volts

19-30

Ground

Common

Init

Output

Input

When pulsed low resets printer

ERROR

Output

Input

When high printer has an error

Ground

Spare

Input

Output

General purpose signal

SLCTIN

Input

Output

General purpose signal

General purpose signals may vary in various equipment or not be present.

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