Apple LaserWriter Select 310 Printer - Manual (Page 45)

C H A P T E R 2
LaserWriter Select 310 Software
Setting Compatibility Operators 33
softwareiomode 2
Setting Communication Parameters 2
The following compatibility operators set Level 1 serial communication parameters.
Serial communication channel (SCC) operator encoding is described in Chapter 3,
“Communication Channels,” in the section “SCC Operator Encoding.”
packetbackchannel 2
Syntax int setsoftwareiomode –
Definition This operator sets the binary protocol mode of the communications
channel according to the value of int:
0 binary protocol off
100 binary protocol on
Binary protocol is standard in the LaserWriter Select 310 printer, and it
should be used by any driver that sends binary data to the printer.
A driver that does not use the binary protocol and does not filter the back
channel data when softwareiomode is 100 will see receive control
characters as quoted characters. In particular, Control-Ds will be seen as
Control-A/ASCII-D.
The softwareiomode operator does not need to be set outside the
server loop in order to be compatible with other printer implementations
of sofwareiomode. However changes to it do not take effect until the
job that makes the changes is completed.
Standard value: 100
Errors rangecheck , stackunderflow, typecheck
Syntax packetbackchannel bool
Definition This operator returns the current back channel packet protocol setting.
Standard value: false
Error stackoverflow