Printronix L5000 Series Maintenance Manual page 255

Interface circuit
The interface circuit is for transmission and reception of signals CLOCK, DATA 1–4,
LOAD, and *STB1–2. An RS–422 interface circuit is used, the same as the interface
between the MPU board and I/O board.
Signal pin assignments
Interface signals are assigned in the following manner to MPU board connecter
(CN4) and I/O board connecter (CN1) pins.
Pin No.
1
3
5
7
9
11
13
15
17
19
21
23
25
Electrical and Wire Data
Signal Pin No.
DATA(–) 2
DATA2(–) 4
DATA3(–) 6
DATA4(–) 8
Vss 10
CLOCK(–) 12
Vss 14
LOAD(–) 16
Vss 18
*STB(–) 20
*STB(–) 22
Vcc 24
Vcc 26
Signal
DATA1(+)
DATA2(+)
DATA3(+)
DATA4(+)
Vss
CLOCK(+)
Vss
LOAD(+)
Vss
*STB(+)
*STB(+)
Vcc
Vcc
6–17