OFF:
IEEE1484.4 is disabled and IEEE1484.4 synchronous commands are ignored. Compatible interface is the initial state.

EPSON Stylus Color 900

 

Revision C

￿Interface state and interface selection

1.3.7.1

IEEE 1284.4 Protocol

When an interface other than parallel interface is selected, the

The packet protocol described by IEEE1284.4 standard allows a device

parallel interface goes into the BUSY state.

to carry on multiple exchanges or conversations which contain data

When an interface other than serial interface is selected, the

and/or control information with another device at the same time across

a single point-to-point link. The protocol is not, however, a device

￿serial interface sets the DTR signal to MARK.

control language. It does provide basic transport-level flow control and

When an interface other than optional interface is selected, the

multiplexing services. The multiplexed logical channels are independent

printer sets “OFF LINE” bit of MNSTS register to the optional

of each other and blocking of one has no effect on the others. The

￿interface.

protocol￿

operates over IEEE1284.

When the printer is initialized or returned to the idle state, the

Automatic selection:

parallel interface enters ready state and the serial interface sets

An initial state is compatible interface and starts IEEE1284.4

the DTR signal SPACE and the printer resets “OFF LINE” bit of

communication when magic strings (1284.4 synchronous

MNSTS register to the optional.

￿commands) are received.

NOTE:An interrupt signal, such as /INIT, on the parallel interface is

ON:

 

not effective while that interface is not selected.

IEEE1284.4 is enabled as initial state. Data sent before the magic

￿string (1284.4 synchronous commands) is discarded.

Product Description

Interface

30

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Epson SEIJ98006 manual Ieee 1284.4 Protocol, Not effective while that interface is not selected
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SEIJ98006 specifications

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