Primera Technology Primera Signature III - Manual (Page 56)

46 Interfacing Information
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:
Pin Number Signal Name Signal Description
1 HSKoExternal Clo ck 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.
5 RxD- 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
8 7 6
5 4 3
2 1
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