Centronics Parallel Interface; 1- Compatibility Mode - Fenix SM2000 Operation Manual

FENIX IMVICO

2.4- CENTRONICS PARALLEL INTERFACE

The SM2000 comply the IEE1284 protocol (NIBBLE MODE).
Copyright © 1994 by the Institute of Electrical and Electronic Engineers, Inc.
2.41- Compatibility mode (Data transmission from host system to the printer: Centronics
compatible)
*Any system sending data to the printer (PC, PLC, custom board, et cetera) is considered to be a host
system.
The compatibility mode supports compatibility with the Centronics parallel interface.
a) Specifications
Data transmission:
Synchronization:
Protocol:
Signal levels:
Connector (printer side):
b) Switching between online and offline mode
The printer does not provide any switch for online/offline mode. The printer is in offline mode in the
following cases:
1) When powering on or until the printer becomes ready for data transmission after it is initialized
by the reset signal from the interface
2) During the self-test.
3) When the cover is open.
4) During paper advance using the paper advance button (paper feed).
5) When the printer stops printing due to 'out of paper'.
6) During macro execution in standby mode.
7) When a temporal voltage abnormality happens to the power supply.
8) When an error occurs.
c) Timing diagram of data reception
Data
nStrobe
tSetup
Busy
TReady tBUSY
nAck
8-bit parallel
nSTB signal externally provided
nACK (acknowledge) and BUSY signals
TTL compatible
ADE-B36BLFDR176 (Honda) or equivalent
(IEEE 1284 B Type)
Data n
tHold
tSTB
Peripheral Busy
tReply tACK
SM2000 OPERATION MANUAL
Data n+1
tnBUSY
tNext
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