Epson TM-U950P Specifications - Page 36

ESC c 4 - power supply

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2.1.2 IEEE 1284 Bidirectional Parallel Interface (Parallel Interface Specifications) Copyright (C) 1993 by the Institute of Electrical and Electronic Engineers, Inc. 1) Specifications Data transmission: 8-bit Parallel Synchronization: Externally supplied nStrobe signals Handshaking: NACK and BUSY signals Signal levels: TTL compatible Connector: 57RE-40360-830B (DDK) or equivalent (IEEE 1284 Type B) Reverse communication : Nibble or Byte Mode (Printer Host) 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. · In the process of self-test. · While the cover is set open. · In the process of paper feeding using the paper feed switch · When the printer runs out of paper, thereby suspending the printing operation in progress (in cases when empty paper supply is detected by either the journal end detector or the journal near end detector with a printing halt feature set enabled due to paper shortage by ESC c 4). · In the process of waiting for a switch for macro execution. · When an error has occurred. 3) 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. For detail description, refer to APPENDIX J. TITLE EPSON TM-U950/U950P Specification (STANDARD) SHEET NO. REVISION AE NEXT 1270-1 SHEET 197

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EPSON
TITLE
SHEET
REVISION
NO.
SHEET
NEXT
TM-U950/U950P
Specification
(STANDARD)
2.1.2
IEEE 1284 Bidirectional Parallel Interface (Parallel Interface Specifications)
Copyright (C) 1993 by the Institute of Electrical and Electronic Engineers, Inc.
1) Specifications
Data transmission:
8-bit Parallel
Synchronization:
Externally supplied nStrobe signals
Handshaking:
NACK and BUSY signals
Signal levels:
TTL compatible
Connector:
57RE-40360-830B (DDK) or equivalent (IEEE 1284 Type B)
Reverse communication :
Nibble or Byte Mode
(Printer Host)
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.
•
In the process of self-test.
•
While the cover is set open.
•
In the process of paper feeding using the paper feed switch
•
When the printer runs out of paper, thereby suspending the printing operation in progress (in
cases when empty paper supply is detected by either the journal end detector or the journal near
end detector with a printing halt feature set enabled due to paper shortage by
ESC c 4
).
•
In the process of waiting for a switch for macro execution.
•
When an error has occurred.
3) 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.
For detail description, refer to APPENDIX J.
E
17
17-1