Epson 440 - Manual (Page 25)

EPSON Stylus Color 440/640/740 Revision A
Chapter 1 Product Description 25
1.3 Interface
This printer provides parallel interface as standard.
1.3.1 Parallel Interface (Forward Channel)
[Transmission mode] 8 bit parallel, IEEE-1284 compatibility mode
[Synchronization]
By /STOPBE pulse
[Handshaking] BY BUSY and /ACKLG signal
[Signal level] TTL compatible level
[Adaptable connector]57-30360 (amphenol) or equivalent
BUSY signal is set high before setting either/ERROR low or PE high
and held high until all these signals return to their inactive state.
BUSY signal is at high level in the following cases.
During data entry (see Data transmission timing)
When input data buffer is full
During -INIT signal is at low level or during hardware
initialization
During printer error (See /ERROR signal)
/ERROR signal is at low level when the printer is in one of the following
states.
Printer hardware error (fatal error)
Paper-out error
Paper-jam error
Ink-out error
PE signal is at high level during paper-out error.
See Table 1-10 in the following page which shows the signal and
connector pin assignments for parallel interface (forward channel *1). In
case of these signals, twist pair line is used and returning side is
connected to signal GND.
*1: Forward channel is the mode when the ordinary data such as an order
to print is sent from the PC to the printer.