EPSON Stylus Color 900 Revision C
Product Description Interface 29
1.3.4 USB Interface
Standard: Based on the following:
Universal Serial Bus Specifications Rev. 1.0
Universal Serial Bus Device Class Definition
for Printing Device Version 1.0
Bit Rate: 12 M bps
Data Encoding: NRZI
Adaptable Connector: USB Series B
Recommended Cable Length:2 meters
Table 1-16. Pin Assignment and Signal of the USB I/F
Figure 1-9. USB Pin Assignment
1.3.5 Printer Language and Emulation
Printer language: ESC/P2
IBM X24E emulation
EPSON Remote
1.3.6 Prevention Hosts from Data Transfer time-out
Generally, hosts abandon data transfer to peripherals when a peripheral
is in the busy state for dozens of seconds continuously. To prevent
hosts from this kind of time-out, the printer receives data very slowly,
several bytes per minute, even if the printer is in busy state. This
showdown is started when the rest of the input buffer becomes several
hundreds of bytes. Finally, the printer is in the busy state continuously
when the input buffer is full.
1.3.7 Auto Interface Selection
The EPSON Stylus Color 900 has four types of interfaces: USB, parallel
interface, Mac serial interface and optional Type-B interface. Each
interface can be selected manually in default setting mode or
automatically.
Manual Selection:
One of four interfaces can be selected in default setting mode.
Automatic Selection:
The automatic interface selection is enabled by the default setting
mode. In this automatic interface selection mode, the printer is
initialized to the idle state scanning for which interface is to receive
data when it is powered on. The interface that receives data first is
selected. When the host stops data transfer and the printer is in the
stand-by 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 let as it is.
Pin No.
Signal
Name
I/O Description
1 Vcc ----
Cable power, Maxi. power consumption
is 100 mA
2 -Data Bi-D Data
3 +Data Bi-D
Data, pull up to +3.3 V via 1.5 K ohms
resistor
4 Ground ---- Cable Ground
Pin #1
Pin #2
Pin #3
Pin #4
