Specifications

CHAPTER 3
LaserWriter Pro Software
44 Interpreter Parameters
Communication Channels 3
The LaserWriter Pro 600 printer has three communication ports: an RS-422 serial port, an
RS-232 serial port, and a Centronics 25-pin parallel port. These ports implement the
following communication channels:
■ %LocalTalk% using the RS-422 serial port in LocalTalk mode
■ %Serial%, and %SerialB% using the RS-422 serial port in LocalTalk mode
■ RS-422 protocols using the RS-422 port
■ RS-232 protocols using the RS-232 port
■ %Parallel% using the Centronics parallel port
The LaserWriter Pro 630 printer has five communication ports: an RS-422 serial port, an
RS-232 serial port, a Centronics 25-pin parallel port, a 14-pin Ethernet connector, and an
external 30-pin SCSI connector. These ports implement the following communication
channels:
■ %LocalTalk% using the RS-422 serial port in LocalTalk mode
■ %Serial%, and %SerialB% using the RS-422 serial port in LocalTalk mode
■ RS-422 protocols using the RS-422 port
■ RS-232 protocols using the RS-232 port
■ %Parallel% using the Centronics parallel port
■ %EtherTalk% using the Ethernet connector
■ the external SCSI port supports a local hard disk drive to store fonts
Each channel has three related parameter sets: nonvolatile, pending, RAM.
■ with nonvolatile parameter sets, the set names contain the suffix _NV. For example,
the nonvolatile parameters associated with %SerialB% are in a parameter set called
%SerialB%_NV. This is a read/write set, and it allows you to make changes that
persist across system restarts.
Type name Read only. This constant always returns a value of
FileSystem.
Legal values: FileSystem
Errors: None
Writeable boolean Read only. Indicates whether you can currently write to the
device. Usually this boolean is true only if the media is
physically able to be written to, and is not write protected.
Legal values: true, false
Errors: None
Table 3-11 Parameters common to all FileSystem devices (continued)
Key Type Details