Apple LaserWriter Select 310 Printer - Manual (Page 16)

C H A P T E R 1
LaserWriter Select 310 Hardware
4 Communication Ports
Communication Ports 1
The LaserWriter Select 310 printer supports two communication ports:
■ RS-232 8-pin serial port
■ Centronics 36-pin parallel port
Figure 1-1 shows the relative positions of these ports on the rear panel of the printer.
Figure 1-1 LaserWriter Select 310 printer side panel connectors
When the LaserWriter Select 310 printer is first powered on, the serial port with binary
protocol enabled is the default communication port. If any character is received over the
Centronics parallel port, the parallel port with binary protocol and a serial back channel
automatically becomes the default port. If you want to change the communication port
back to serial mode after a job has been sent over the parallel port, you should power
down and then restart the printer. Similarly, if you wish to change printer drivers, you
should power down and then restart.
IMPORTANT
It is better to operate the LaserWriter Select 310 printer in either a serial
or a parallel communication environment than to transmit both
serial and parallel data. Attempting to operate in both environments may
cause unpredictable results.
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Serial Port for RS-232C Devices 1
The LaserWriter Select 310 printer supports the RS-232 protocol by means of an 8-pin
mini-DIN connector. This connector provides the interface between the printer and Apple
Macintosh computers. Figure 1-2 shows the connector pin designations and
Table 1-2 lists the pin functions for this 8-pin connector. You can also connect the printer
directly to a Macintosh computer using a Peripheral-8 (M0197) cable and communicate
with the printer using the LaserWriter Select 310 printer driver, or a terminal emulation
program such as MacTerminal.
RS-232 8-pin
serial port
Centronics 36-pin port SIMM card slot