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

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Image 61
Apple 310 manual Communication Protocols, Simple Communication Protocol