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Appendix B: Interfacing Information 81
4250/4225 Card Printer UserÕs Manual
C. MINI 8-PIN SERIAL INTERFACE
The mini 8-pin serial interface connector is the standard interface used by
Macintosh. This 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 HSKo External Clock Output
± 2V < Vout < ± 3.6V; Rout < 450½
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 > 12K½
6 TxD+ Not Connected
7 GPi Not Connected
8 RxD+
Receive data. Received uninverted
at SCCÕs RxD.
Vih = 0.2V; Vil = -0.2V; Rin > 12K½
TABLE B-2: Serial Interface Pin Assignments
8 7 6
5
4
3
21
510291_card printer 11/24/98 12:19 PM Page 81