User`s manual

C. Mini 8-Pin
Serial Interface
The mini 8-pin serial interface connector is the
standard interface used by Macintosh. Due to the
Color Sign PrinterÕs high-speed rate of data
transmission, its serial interface port communicates
only with Macintosh GeoPorts. If your Macintosh
does not have a Geo-compatible serial port, you
will not be able to use the Color Sign PrinterÕs
serial port. The Color Sign PrinterÕs serial port
mates with a standard computer to printer serial
cable. Always use a high-quality serial cable which
is less than 6 feet in length.
Pin assignments are as follows:
TABLE A-2: Serial Interface Pin Assignments
87
Pin Signal Signal
Number Name Description
1 HSKo External Clock Output
± 2V < Vout < ± 3.6V;
Rout < 450Ω
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 > 12KΩ
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 > 12KΩ
8 7 6
5
4
3
21