EPSON Stylus Color 900 Revision C
Product Description Interface 23
1.3 Interface
The EPSON Stylus Color 900 is equipped with USB, bi-directional 8-bit
parallel interface, serial interface and a card slot for an optional Type-B
interface.
1.3.1 Parallel Interface (Forward Channel)
Transmission mode: 8 bit parallel, IEEE-1284 compatibility mode
Synchronization: By /STROBE pulse
Handshaking: BY BUSY and /ACKLG signal
Signal level: TTL compatible level
Adaptable connector: 57-30360 (amphenol) or equivalent
The BUSY signal is set high before setting either/ERROR low or PE
high, and held high until all these signals return to an inactive state.
The BUSY signal is HIGH:
During data entry (see Data transmission timing)
When the input data buffer is full
While /INIT signal is at LOW level or during hardware
initialization.
During a printer error condition (See /ERROR signal).
When the parallel interface is not selected.
The /ERROR signal is LOW when one of the following error has
occurred:
Printer hardware error (fatal error)
Paper Out error
Paper Jam error
Ink Out error
The PE signal is at a high level during Paper Out error.
See Figure 1-8 and Table 1-9 which show the data transmission timing.
Figure 1-8. Data Transmission Timing
DATA
STROBE
BUSY
-ACKNLG
data byte n
data byte n+1
thold
tsetup
tstb
tnext
tready
tbusy
treply ta ck
tnbusy
