Xerox 4235, Руководство по планированию установки, Страница: 70 / 148

SYSTEM CONFIGURATION
6–4 XEROX 4235 LPS INSTALLATION PLANNING GUIDE
Table 6–1. Centronics pin assignments and signals
Signal
name Pin*
# Source Description
DATA
STROBE 1, 19 Host computer system A 1.0 microsecond pulse (minimum) used to clock data from
the processor to the 4235 LPS.
DATA 1 2, 20 Host computer system Data 1 through data 8 are input signals. A high represents
one; a low represents zero.
DATA 2 3, 21 Host computer system
DATA 3 4, 22 Host computer system
DATA 4 5, 23
DATA 5 6, 24 Host computer system
DATA 6 7, 25 Host computer system
DATA 7 8, 26 Host computer system
DATA 8 9, 27 Host computer system
ACKNLG 10, 28 4235 LPS The acknowledge pulse indicates the input of a character
into memory or at the end of a functional operation.
BUSY 11, 29 4235 LPS BUSY indicates that the 4235 LPS cannot receive data.
PE 12 4235 LPS This signal is always zero.
SELECT 13 4235 LPS This signal remains at one after warm–up and indicates there
are no fault conditions.
Chassis
Ground 17 4235 LPS This name indicates the frame ground.
FAULT 32 4235 LPS This is the 4235 LPS indicator for a laser printing system fault
(for example: paper jam, dry ink out, and so forth).
The following pins are not used: 15, 33, 34, 35, 36.
* The second pin of the pair is the twisted signal return (+0V).