Primera Technology III manual Mini 8-PIN Serial Interface, Pin Number, Signal Description

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B. MINI 8-PIN SERIAL INTERFACE

The mini 8-pin serial interface connector is the standard interface used by Macintosh. The printer’s serial port mates with a standard computer to printer serial cable. For best results, always use a high-quality serial cable which is less than 6 feet in length.

Pin assignments are as follows:

8 7 6

5

2

4

1

3

Pin Number	Signal Name	Signal Description
1	HSKo	External Clock Output
		± 2V < Vout < ± 3.6V; Rout < 450ž
2	HSKi	Not Connected
3	TxD-	Not Connected
4	GND	Signal ground. Connected to
		logic and chassis ground.

5RxD- Receive data (inverted);Vih = 0.2V;

Vil = -0.2V; Rin > 12Kž

6	TxD+	Not Connected
7	GPi	Not Connected
8	RxD+	Receive data. Received uninverted
		at SCC’s RxD. Vih = 0.2V;
		Vil = -0.2V; Rin > 12Kž

TABLE A-1: Serial Interface Pin Assignments

46 Interfacing Information