QMS 2025, Руководство администратора

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Centronics
Parallel
QMS 3825/3225/2025 System Administrator’s Guide B-4
Notes to the Centronics Parallel Cable
Pinouts Table
Direction refers to the direction of signal flow as viewed from the
printer.
Return denotes twisted-pair return and is to be connected at signal-
ground level. When wiring the interface, be sure to use a twisted-pair
cable for each signal and never fail to complete connection on the
return side. To prevent noise effectively, these cables should be
shielded and connected to the chassis of the system unit and printer,
respectively.
All interface conditions are based on TTL level. Both the rise and fall
times of each signal must be less than 0.2 microseconds.
Data transfer must be carried out by observing the ACKNLG and
BUSY signal.
The cable must have an overall braided shield, Belden 8345 or equiv-
alent.
Connectors must have shielded housings. The overall shield must be
bonded to the shielded housings at both ends of the cable.
❖
11 29 BUSY+ Out
12 30 PE+ Out
13 - SELECT Out
16 - GND -
18 - VCC TEST -
19-30 - GND -
31 - IPRIME In
32 - FAULT- OUT
33 - GND -
34 - RESERVED -
35 - RESERVED -
Signal
Pin No.
Return
Pin No.
Signal Direction