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CHAPTER 3
Communication Channels
Communication Protocols 49
Figure 3-1 SCC operator encoding
Communication Protocols 3
The LaserWriter Select 310 printer supports both simple and binary communication
protocols for serial and parallel channels. Several character codes in both protocols are
reserved for communication functions and are not passed through the PostScript
interpreter. The default protocol is binary. The section “Setting Device Parameters,”
“setsoftwareiomode,” in Chapter 2, describes how to change the default protocol
from binary to simple.
Simple Communication Protocol 3
Table 3-4 lists the character codes reserved for communication functions in the simple
communication protocol. The ASCII character codes are given in decimal.
Table 3-4 Reserved characters in simple communication protocol
Character
ASCII
code Function
Control-C 3 Interrupt. Causes execution of the PostScript language
interrupt error. See the PostScript Language Reference
Manual, Chapter 6, for further information on interrupt.
Control-D 4 End of file.
Control-S 19 Stop output (XOFF). Functional only if XON/XOFF flow
control is in use.
continued
Example
9 19200 2 setsccbatch
sum of decimal values :
Feature Description Decimal value
Parity Even 2
Flow control XON/XOFF 0
Data bits Standard 0
Stop bits 1 0
baud rate: 19200
channel type: 8-pin serial