Apple Macintosh Wiring - Quantum Data 801GC, 801GF, 801GX Owner's And Programmer's Manual

5-12
Chapter 5: Making Connections

Apple Macintosh Wiring

It is possible to connect the 801G* to a serial port on
a Macintosh computer. Apple uses two types of serial
connectors on its Macintosh series.
• The Mac Plus, SE and II have an 8 pin female
mini-DIN connector.
• The Mac 128, 512 and 512E have a 9 pin fe-
male D-Sub connector.
The table and figure below show how to make the
proper connections between the 801G* and a Mac
computer using either type of connector.
801GX Macintosh
9-pin D-Sub 8-pin DIN
Connector Connector
pin 1 NC
pin-2 Rx pin-3 TXD-
pin-3 Tx pin-5 RXD-
pin-4 DTR
pin-4 GND and
pin-5 GND
pin-8 RXD+
pin-6 NC
pin-7 RTS pin-2 HSKi
pin-8 CTS pin-1 HSKo
pin-9 NC
Figure 5-7
8 pin Female
Mini-Din
Pin Numbering
• Communication with the 801G* is via RS-232C
protocol using factory deafult settings of 2400
baud, 8 data bits, 1 stop bit, no parity, no
handshake, full duplex.
• The current firmware allows you to increase
the baud rate beyond 2400 using a RTS/CTS
handshake. We therefore recommend that you
wire the RTS and CTS signals if you plan to
operate the serial port at faster than 2400 baud*.
Model 801GC, 801GF & 801GX¥Rev. A
Table 5-7
Macintosh
9-pin D-Sub
Macintosh Serial
Connector
Connections
pin-5 TXD-
pin-9 RXD-
pin-3 GND and
pin-8 RXD+
pin-7 HSKi
pin-6 +12V