Apple 310 manual Communication Protocols, Simple Communication Protocol

C H A P T E R 3

Communication Channels

Figure 3-1SCC operator encoding

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

Communication Protocols

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

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
	ASCII
Character	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

Communication Protocols 49