Xerox 4235, Руководство по планированию установки, Страница: 69 / 148

SYSTEM CONFIGURATION
XEROX 4235 LPS INSTALLATION PLANNING GUIDE 6–3
Type: Twisted pairs, overall foil or braid shield
Number of conductors: 15 pairs
Wire size: 22 AWG stranded
Cable length: Length should not exceed 10 feet (3.1 m)
Shield connection: To the connector conductive case at the 4235
printer; to the frame ground at the data source
Cable connector: Male
Table 6–1 lists the pin assignments and signals for the
Centronics interface.
The main control signals are BUSY, SELECT, and FAULT. At
power–up, BUSY is at logic one, and SELECT and FAULT are at
logic zero. BUSY indicates that the 4235 LPS cannot receive
data (normally, BUSY cycles from logic zero to one and back to
zero again once for every byte received). SELECT and FAULT
change to logic one after warm–up and remain at logic one as
long as the 4235 LPS is powered up.
The Centronics interface does not support the following codes:
•
The programmable paper feed code (1CH, octal 034)
•
The elongated character code (0EH, octal 016)
•
The character density code (12H, octal 022)
•
The delete code (7FH, octal 177), which is used to print
either an error character or an assigned character.