FENIX IMVICO SM2000 OPERATION MANUAL
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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:
8-bit parallel
Synchronization:
nSTB signal externally provided
Protocol:
nACK (acknowledge) and BUSY signals
Signal levels:
TTL compatible
Connector (printer side):
ADE-B36BLFDR176 (Honda) or equivalent
(IEEE 1284 B Type)
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 n Data n+1
Data
tHold
nStrobe
tSetup tSTB
Busy
Peripheral Busy
TReady tBUSY
nAck
tnBUSY
tReply tACK
tNext