Ieee 1284 Bidirectional Parallel Interface(Parallel Interface Specifications) - Epson TM-H5000II Series Manual

CONFIDENTIAL

2.1.2 IEEE 1284 Bidirectional Parallel Interface(Parallel Interface Specifications)

Copyright (C) 1993 by the Institute of Electrical and Electronic Engineers, Inc.
2.1.2.1 Compatibility Mode
(Data Transmission from Host to Printer: Centronics compatible)
(1) Specifications
Data transmission:
Synchronization:
Handshaking:
Signal levels:
Connector:
Reverse communication (Printer Host): Nibble or Byte Mode
(2) Switching between on-line and off-line
The printer is not equipped with any on-line/off-line switch. The printer is placed into off-line
status in either of the followings:
· When the power is turned on or until the printer becomes ready for data transmission after it
is initialized by the reset signal (nInit) from the interface.
· During the self-test.
· When the cover is open.
· During paper feeding using the FORWARD/REVERSE button.
· When the printer stops printing due to a paper-end (only when the paper roll is not present).
· During macro executing standby status.
· When a temporary abnormality occurs in the power supply voltage.
· When an error has occurred.
2.1.2.2 Reverse Mode (Data Transmission from Printer to Host)
The STATUS data transmission from the printer to the host is proceeded in the Nibble or Byte
mode.
· Description
This mode allows data transmission from the asynchronous printer under the control of the
host.
Data transmissions in the Nibble Mode are made via the existing control lines in units of four
bits (Nibble). In the Byte Mode, data transmissions are proceeded by making the eight-bits
data lines bidirectional.
The both modes fail to be proceeded concurrently with the Compatibility Mode, thereby
causing half duplex transmission.
8-bit Parallel
Externally supplied nStrobe signals
nAck and Busy signals
TTL compatible
57RE-40360-830B (DDK) or equivalent (IEEE 1284 Type B)
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TM-H5000 II II II II series
Specification
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