Service manual

EPSON Stylus PHOTO 870/1270 Revision B
PRODUCT DESCRIPTIONS Interface 26
1.3.3 USB Interface
"
Standard: Based on:
“Universal Serial Bus Specifications Rev. 1.0”
“Universal Serial Bus Device Class Definition
for Printing Devices Version 1.0”
"
Bit rate: 12Mbps (Full Speed Device)
"
Data encoding: NRZI
"
Adaptable connector: USB Series B
"
Recommended cable length:2 meters
Figure 1-8. USB Pin Assignment
Table 1-15. Connector Pin Assignment and Signals
Pin No. Signal Name I/O Function Description
1VCC -
Cable power. Max. power
consumption is 2mA.
2 -Data Bi-D Data
3 +Data Bi-D
Data, pulled up to +3.3 V via
1.5K ohm resistor.
4 Ground - Cable ground
Pin #1
Pin #3
Pin #2
Pin #4