EPSON Stylus Photo 720 / EPSON Stylus Photo EX3
Revision A
Product Description
Interface Specification
16
1.3.3 USB (Universal Serious Bus)
Following shows specification.
o
Standard:
n
Universal Serial Bus Specifications Revision 1.0
n
Universal Serial Bus Device Class Definition for Printing Devices version 1.1
o
Bit rate:
12Mbyte (Full Speed Device)
o
Data encoding:
NRZI
o
Adaptable connector:
USB Series B
o
Recommended cable length:
max. 2 meters
Figure 1-5. USB Interface Port
1.3.4 Miscellanea
1.3.4.1 Preventing Hosts from Data Transfer Time-out
Generally, hosts abandon data transfer to peripherals when a peripheral is in busy state
for dozens of seconds continuously. To prevent hosts from acting this kind of time-out,
when the open space of input buffer becomes 1024 byte, the printer receives data per
certain period of time (1 second) and avoid BUSY state continues for a long time. The
printer will be in busy state continuously when the input buffer finally gets full. This
operation is not performed while communicating by IEEE1284.4 protocol.
1.3.4.2 Interface Selection
IEEE-1284 parallel interface and USB interface is switched by auto select function.
The following explains the conditional shift of the I/F auto select function and the
operations when specific interface is set.
AUTOMATIC SELECTION
In this automatic interface selection mode, the printer is initialized to the idle state
scanning which interface receives data when it is powered on. Then the interface that
receives data first is selected. When the host stops data transfer and the printer is in the
stand-by state for the seconds, the printer is returned to the idle state. As long as the
host sends data or the printer interface is in the busy state, the selected interface is let as
is.
INTERFACE STATE AND INTERFACE SELECTION
o
When the parallel interface is not selected, the interface became to the busy state.
When the printer is initialized or returned to the idle state, the parallel interface
became to the ready state. Caution that the interrupt signal such as the -INIT signal
on the parallel interface is not effective while the inter face is not selected.
Table 1-8. Connector Pin Assignment and Signals
Pin.
No
Signal Name
I/Out
Function Description
1
VCC
--
Cable power. Maximum power consumption
is 2mA.
2
-Data
I/O
Data
3
+Data
I/O
Data. Pull up to +3.3V via 1.5K ohm resistor.
4
Ground
--
Cable ground.
Pin #1
Pin #2
Pin #3
Pin #4
usb
Содержание Stylus Photo 720
Страница 5: ...Revision Status Revision Issued Date Description Rev A April 6 2000 First Release ...
Страница 8: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Страница 29: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 51: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 64: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 94: ...C H A P T E R 5 ADJUSTMENT ...
Страница 114: ...C H A P T E R 6 MAINTENANCE ...
Страница 121: ...C H A P T E R 7 APPENDIX ...
Страница 150: ......
Страница 151: ......
Страница 152: ......
Страница 153: ......
Страница 154: ......