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Epson Stylus COLOR 800 Service Manual: Optional Interface; Preventing Hosts From Data Transfer Timeout; Interface Selection

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EPSON Stylus &2/25 800

1.5.4 Optional Interface

The Stylus COLOR 800 supports an optional Type-B interface (Level 2) with the following characteristics.
Reply Message
‰When ESC/P 2 mode is selected:
Main type
Product name
Emulation type
Entity type
‰When IBM X24E is selected:
Main type
Product name
Emulation type
Entity type
1.5.5 Preventing Hosts from Data Transfer Timeout
Generally, hosts abandon data transfer to peripherals when a peripheral is BUSY continuously for dozens
of seconds. To prevent this kind of timeout, the printer receives data very slowly, several bytes per minute,
even the printer is in a busy state. This slowdown starts when the remainder of the input buffer drops
under several hundred bytes. Finally, the printer is BUSY continuously when the input buffer is full.
1.5.6 Interface Selection
The Stylus COLOR 800 can have three types of interfaces: parallel, serial, and optional Type-B. Each
interface can be selected manually or automatically. Both modes are selected through default setting
mode.
Manual Selection
One of 3 interfaces selected through the default setting mode. The selected interface is fixed.
Automatic Selection
Automatic interface selection is enabled in default setting mode. In automatic interface selection mode,
the printer is initialized to the idle state when it is powered on (*1) scanning which interface is to receive
data. Then the interface that receives data first is selected. When the host stops data transfer and the
printer is in the standby state for a number of seconds, the printer returns to the idle state. As long as the
host sends data or the printer interface is busy state, the selected interface is left as it is.
*1: No interface is selected in this state.
Interface Selection and Interface State
‰When an interface other than the parallel interface is selected, the parallel interface goes into the
BUSY state.
‰When the interface other than serial interface is selected, the serial interface sets the DTR signal
MARK.
‰When the printer is initialized and returned to idle state, the parallel interface goes into ready state
and the serial interface sets the DTR signal SPACE.
Note: An interrupt signal such as the INIT on the parallel interface is ignored while that interface is not
selected.
1-18
Download Service Manual and Resetter Printer at http://printer1.blogspot.com
MTP48p, PW136cl10cpi, PRG(W0xxxx)rev, SPD0fast
Stylus COLOR 800
ESCPL2-00
EPSONLQ2
MTP48p, PW136cl10cpi, PRG(W0xxxx)rev, SPD0fast
Stylus COLOR 800
PRPXL24-00
EPSONPRPXL24
Rev. A

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