Interface Timing; Serial Interface Pin Assignments - Epson EPL-6000 Product Information

Interface timing

The figure below shows the timing for the parallel interface.
SELECT
DATA STROBE
BUSY
ACK
A: 1 ps (min.)
Signal levels
Output signals:
Input signals:
Serial interface
The laser printers built-in serial interface can be set for either
RS-232C or RS-422A operation. These interfaces have the following
characteristics.
Data format
Word length:
Parity:
Start bits:
Stop bits:
The data format can be set using functions and menu items in
SelecType.
Baud rate
300, 600, 1200, 2400, 4800, 9600, 19200 bits per second.
Signal level
RS-232C:
RS-422A:
Transmission procedures
Ready/ Busy:
The DTR signal level changes to HIGH when the printer is ready
l
to receive data (or to LOW if set for inverted operation by
SelecType).
The DTR signal level changes to LOW when the printer is not
l
ready to receive data (or to HIGH if set for inverted operation by
SelecType).
XON/XOFF:
When the printer is ready to receive data, it sends an XON
l
(11 hex) to the host computer through the TD line for the
RS-232C interface or SD+ and SD- lines for the RS-422A
interface. When ROBUST-XON is set to ON (by SelecType). and
data is not received within one second of the XON signal being
sent, the printer sends an XON signal every second. If ROBUST-
XON is set to OFF, the printer sends only one XON signal.
Laser Printers
8: 1 )B (min.) C: 1 ps (min.) D: approx. 6 ps
7 or 8 bits
0 or 1 bit (None, Odd, Even, Ignore)
1 bit
1 or 2 bits
When the printer is not ready to receive data, it sends an XOFF
l
(13 hex) to the host computer through the TD line for the
RS232C interface or SD+ and SD- lines for the RS-422A
interface.
The printer is ready to receive data when it is on line, no error
l
conditions exist, and the buffer is not tilled above the overload
value set with SelecType.
The printer is not ready to receive data when it is off line or
l
when it is on line but the remaining capacity of the data buffer is
less than the overload buffer value.

Serial interface pin assignments

The serial interface connector pm assignments and a description of
the interface signals are shown in the table below. The direction of
signals is given relative to the printer.
7/18/89
EPL-6000 LASER PRINTER
Description
Frame ground. Safety
ground Iine.
Transmit data
This pin transmits serial
data from the printer to
the computer.
Receive data.
This pin transmits serial
data from me computer to
Request to send. This pin
is HIGH when power is on
Clear to send. This pin
that
indicates the computer
is to receive data
ready
from the printer.
Data set ready. This pin
indicates mat the
is ready to communicate
Signal ground. This pin
provides a ground for all the
signal lines.
Send data. This
pin sends serial data from
the printer to the computer.
Signal level is RS-422A
Send data. This
pin sends serial
printer
data from me
the computer. Signal level
is RS-422A
Same as DTR.
Receive data. This
transmits serial data from
the
computer to the printer
Signal Ievel is RS-422A.
Data terminal ready. This
pin indicates
whether
the printer is
ready to
receive data. If the printer
ready protocol is not
selected, this pin is always
HIGH
(i.e. the printer
ready to receive data). If
protocol
printer ready
selected, the printer can
accept data when the pin
level is HIGH. and cannot
accept data when the pin
level is LOW. When busy
Not a signal, but a +5V
supply
power output.
Maximum of 300mA
I
computer
to
I
pin
or not i
is
is
i
EPL-3