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(8)
Host interface
The printer has the following interfaces to the host.
Centronics bi-directional parallel interface
OKI HSP interface (Option)
The single effective interface or the automatic interface select mode can be selected
using the menu. If the busy state of the printer continues for a long time period, the buffer
near-full control releases the busy status at constant intervals even if the host side is
busy so as not to cause interface time-out at the host side.
(a) Centronics bi-directional parallel interface
This is an interface confirming to IEEE-1284 and provides either unidirectional ad
bi-directional communications according to each of the following communication modes.
Compatibility mode - Unidirectional communications from the host to the printer.
z
z
Nibble mode - This mode transfers 4-bit wide data from the printer to the host. In
z
z
this mode, each bit of 1-byte data transmits in the form of two nibbles using
ERROR, BUSY, FAULT, and SELECT signal leads. This mode can provide
bi-directional operation in combination with the compatibility mode.
ECP mode - This mode provides the asynchronous bi-directional interface and
z
z
transmits and receives 1-byte data using eight data signal leads under semi-duplex
control by the host.
When the power is turned on, the compatibility mode is automatically selected. The
change to another mode form the compatibility mode is made through negotiation. (When
the BI-DIRECTION is set to ENABLE in the menu, this change can be performed.) (For
the electrical/physical characteristics of this interface, see APPENDIX B).
(b) OKI HSP interface (Option)
This interface (slot) is an OKI unique universal interface that provides the platform to
connect various boards (including those supplied by third vendors) such as the LAN
connection expansion board and SCSI expansion board.
Any expansion boards compatible with this interface can be mounted on the Control
board the piggyback board from without modifying the program at the printer side. Refer
to the Conceptual Diagram of the OKI HSP interface.
Conceptual Diagram of OKI HSP Interface
Содержание OKIPAGE 8c
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